CN105257574A - Oblique flow and centrifugal combined compressor - Google Patents
Oblique flow and centrifugal combined compressor Download PDFInfo
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- CN105257574A CN105257574A CN201510848077.9A CN201510848077A CN105257574A CN 105257574 A CN105257574 A CN 105257574A CN 201510848077 A CN201510848077 A CN 201510848077A CN 105257574 A CN105257574 A CN 105257574A
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Abstract
The invention discloses an oblique flow and centrifugal combined compressor. The oblique flow and centrifugal combined compressor comprises an oblique flow compressor, a centrifugal compressor and a backflow device. The backflow device is in a gooseneck shape and is connected between the oblique flow compressor and the centrifugal compressor. The backflow device comprises a backflow device curve section channel, a backflow device blade and a backflow device slewing section channel which are connected in sequence. An inlet of the backflow device curve section channel is connected with an outlet of an oblique flow diffuser. The backflow device curve section channel is in an arc shape, so that the backflow device blade is close to the front side of the oblique flow diffuser, and an outlet of the backflow device slewing section channel is connected with an inlet of a centrifugal impeller. On the basis that the axial length of the oblique flow and centrifugal combined compressor is shortened, the whole flow channel structure is simplified, large-angle turns of airflow in the backflow device channels are decreased, pneumatic loss is small, and then the overall efficiency of the combined compressor is improved. Moreover, the axial length of the combined compressor is further shortened, and the oblique flow and centrifugal combined compressor is more compact in structure and has more excellent rotor dynamic characteristics.
Description
Technical field
The present invention relates to gas compressor technical field, the centrifugal combined compressor of the oblique flow in particular to a kind of large-flow compact type.
Background technique
The centrifugal combined compressor of oblique flow is a kind of combined compressor type between axial flow centrifugal compressor and two stage centrifugal Capability of Compressor, compared with the centrifugal combined compressor of axial flow, there is single-stage pressure ratio high, number of components is few, the simple feature of structure, compared with two stage centrifugal gas compressor, there is flow large, the feature that efficiency is high.Therefore, the centrifugal combined compressor of current oblique flow has become a development focus of combined compressor.
The centrifugal combined compressor of existing oblique flow generally comprises two-stage, and the first order (import level) is inclined flow air compressor, and the second level (export-grade) is centrifugal compressor.As the inclined flow air compressor of import level, in order to improve the matching efficiency with later stages centrifugal compressor, usually need the outlet flow of inclined flow air compressor to press down, think that the centrifugal compressor of export-grade provides a little inlet radius, improve the efficiency of centrifugal compressor.
The scheme of the centrifugal combined compressor of existing conventional oblique flow has two classes, and a class is bow-backed type aerodynamic arrangement as shown in Figure 1, and another kind of is ultra-compact S type aerodynamic arrangement as shown in Figure 2.
The defect of above two schemes is: in the first kind scheme shown in Fig. 1, comprise inclined flow air compressor 101, centrifugal compressor 102 and return channel 103, the axial length of combined compressor is long, the rotor-support-foundation system of whole gas compressor can be caused axially elongated, thus bring rotor dynamics unstability.In Equations of The Second Kind scheme shown in Fig. 2, comprise inclined flow air compressor 201, centrifugal compressor 202 and return channel 203, in order to overcome the technological deficiency of scheme one, adopt ultra-compact S type return channel 203 aerodynamic arrangement, can axial length be shortened, but cause the complicated of whole flow passage structure, air-flow in compact return channel 203 passage repeatedly wide-angle turn back, aerodynamic loss is comparatively large, because the efficiency of centrifugal compressor 202 is usually all lower, therefore causes the efficiency of whole combined compressor on the low side.In addition, the common feature of above-mentioned two schemes is inclined flow air compressors 101, the diagonal impeller outlet-inclined impeller vane angle of 201 is all at about 40 °, such aerodynamic arrangement, cause above-mentioned two schemes all can only be applicable to the inclined flow air compressor of mesolow ratio, make whole combined compressor be difficult to be applicable to more high pressure ratio scope.
Summary of the invention
A main purpose of the present invention is at least one defect overcoming above-mentioned prior art, provides a kind of rotor-support-foundation system axial length shorter and the centrifugal combined compressor of efficiency is higher oblique flow.
For achieving the above object, the present invention adopts following technological scheme:
According to an aspect of the present invention, provide a kind of oblique flow centrifugal combined compressor, comprise inclined flow air compressor, centrifugal compressor and return channel; Described inclined flow air compressor is as the first order in the two-stage of the centrifugal combined compressor of described oblique flow, comprise the diagonal impeller and oblique flow Diffuser that connect successively, the Way out of described diagonal impeller and the axis of the centrifugal combined compressor of described oblique flow have a tilt angle, and the outlet of described oblique flow Diffuser extends towards the direction of the outlet of described diagonal impeller; Described centrifugal compressor, as the second level in the two-stage of the centrifugal combined compressor of described oblique flow, comprises the centrifugal impeller, radial diffuser and the axial Diffuser that connect successively; Described return channel is gooseneck shape and is connected between the described first order and the described second level, described return channel comprises the return channel turnaround section passage, return channel blade and the return channel meander sections passage that connect successively, the import of described return channel turnaround section passage is connected to the outlet of described oblique flow Diffuser, described return channel turnaround section passage is curved, to make described return channel blade on front side of described oblique flow Diffuser, the outlet of described return channel meander sections passage is connected to the import of described centrifugal impeller.
According to one of them mode of execution of the present invention, the tilt angle between the Way out of described diagonal impeller and its running shaft direction is 40 ° ~ 80 °.
According to one of them mode of execution of the present invention, angle between the bearing of trend of described return channel blade and the bearing of trend of described oblique flow Diffuser levels off to 0 °, to make to level off to 0 ° by the angle between the airflow direction of described return channel blade and the airflow direction of described oblique flow Diffuser.
According to one of them mode of execution of the present invention, described return channel blade and described oblique flow Diffuser are straight line type, and the extended length of described return channel blade is greater than the extended length of described oblique flow Diffuser.
According to one of them mode of execution of the present invention, the inlet diameter of described return channel is greater than its outlet diameter, and namely the inlet diameter of described return channel turnaround section passage is greater than the outlet diameter of described return channel meander sections passage.
According to one of them mode of execution of the present invention, the sectional area of the passage of described return channel is the structure of first increases and then decreases from front to back.
According to one of them mode of execution of the present invention, the air-flow rectification flowed into by described inclined flow air compressor can be the pre-rotational gas flow of ± 15 ° by described return channel blade, and flows into described centrifugal compressor.
According to one of them mode of execution of the present invention, described return channel meander sections passage is curved, identical with the running shaft direction of described diagonal impeller to make by the airflow direction of its outlet outflow.
According to one of them mode of execution of the present invention, described diagonal impeller and described centrifugal impeller are the structure of a shared running shaft.
According to one of them mode of execution of the present invention, the running shaft of described diagonal impeller and the running shaft of described centrifugal impeller are two running shafts arranged respectively, and described two running shafts are positioned on straight line.
As shown from the above technical solution, the advantage of the centrifugal combined compressor of oblique flow that proposes of the present invention and good effect are:
The centrifugal combined compressor of oblique flow that the present invention proposes, cygneous structural design is adopted by return channel, on the basis of shortening axial length, simplify whole flow passage structure, the wide-angle of air-flow in return channel passage is turned back minimizing, aerodynamic loss is less, and then promotes the whole efficiency of combined compressor.Further, by the structural design of return channel blade on front side of oblique flow Diffuser, the axial length of combined compressor is shortened further, and structure is compacter, has more excellent rotor dynamics.
In addition, design based on said structure, coordinate the tilt angle between the Way out of diagonal impeller and its running shaft direction to be the structural design of 40 ° ~ 80 ° simultaneously, can ensure that inclined flow air compressor has higher boosting capability and larger air-flow through-current capability, and then the requirement of large discharge operating range and high pressure ratio scope can be met.
Accompanying drawing explanation
Consider the following detailed description to the preferred embodiment of the present invention in conjunction with the drawings, various target of the present invention, feature and advantage will become more apparent.Accompanying drawing is only exemplary diagram of the present invention, and not necessarily is drawn in proportion.In the accompanying drawings, same reference character represents same or similar parts all the time.Wherein:
Fig. 1 is the meridional channel figure of the centrifugal combined compressor of a kind of existing oblique flow;
Fig. 2 is the meridional channel figure of the centrifugal combined compressor of another kind of existing oblique flow;
Fig. 3 is the meridional channel figure of the centrifugal combined compressor of a kind of oblique flow according to an illustrative embodiments.
Wherein, description of reference numerals is as follows:
101. inclined flow air compressor; 102. centrifugal compressor; 103. return channel; 201. inclined flow air compressor; 202. centrifugal compressor; 203. return channel; 1. inclined flow air compressor; 11. diagonal impellers; 12. oblique flow Diffusers; 13. running shafts; 2. centrifugal compressor; 21. centrifugal impellers; 22. radial diffusers; 23. axial Diffusers; 24. running shafts; 3. return channel; 31. return channel turnaround section passages; 32. return channel blades; 33. return channel meander sections passages; α. tilt angle; β. angle.
Embodiment
To in the following description of the present invention, carry out with reference to accompanying drawing, described accompanying drawing forms a part of the present invention, and wherein shows different example arrangement, system or the step that can realize many aspects of the present invention by way of example.Should be understood that, other specified scheme of parts, structure, exemplary means, system and step can be used, and 26S Proteasome Structure and Function amendment can be carried out when not departing from the scope of the invention.And, although term " front side ", " flowing to ", " outflow ", " axis " etc. can be used in this specification to describe different example feature of the present invention and element, but these terms are used for herein only for convenience, such as with reference to the accompanying drawings described in the direction of example.The specific three dimensional direction that any content in this specification all should not be construed as Structure of need just falls within the scope of the present invention.
Consult Fig. 3, in Fig. 3, representatively illustrate the meridional channel figure of the centrifugal combined compressor of the oblique flow that can embody principle of the present invention.In this illustrative embodiments, the centrifugal combined compressor of oblique flow that the present invention proposes is for aero gas turbine engine, and being arranged on aero gas turbine engine by the centrifugal combined compressor of this oblique flow is that example is described.Those skilled in the art it is easily understood that, for centrifugal for this oblique flow combined compressor is applied in other various equipment or system, and to following embodiment make multiple remodeling, interpolation, substitute, delete or other change, these change still in the scope of principle of the present invention.
As shown in Figure 3, in the present embodiment, the centrifugal combined compressor of oblique flow that the present invention proposes mainly comprises the inclined flow air compressor 1, return channel 3 and the centrifugal compressor 2 that connect successively.It should be noted that, in the following description, be the position relationship describing Each part in the mode that related domain is usual.For example, related domain is usually by the position of the centrifugal compressor 2 shown in Fig. 3 relative to inclined flow air compressor 1, be described as prime or front side that centrifugal compressor 2 is positioned at inclined flow air compressor 1, then in the following description, the Directional words of " front " or " afterwards " namely refers to diagonal impeller 11, or the running shaft 13,24 of centrifugal impeller 21 is roughly direction, be " afterwards " near inclined flow air compressor 1 side, be " front " near centrifugal compressor 2 side.Therefore, the description that above-mentioned inclined flow air compressor 1, return channel 3 and centrifugal compressor 2 connect successively, namely return channel 3 is connected on front side of inclined flow air compressor 1, and centrifugal compressor 2 is positioned on front side of return channel 3.And for example, in the following description, " axis " is running shaft 13 direction (or running shaft 24 direction of centrifugal impeller 21) of diagonal impeller 11.
As shown in Figure 3, in the present embodiment, inclined flow air compressor 1 is as the first order (i.e. import level) in the two-stage of the centrifugal combined compressor of oblique flow, comprise the diagonal impeller 11 and oblique flow Diffuser 12 that connect successively, the axis of the Way out of diagonal impeller 11 and the centrifugal combined compressor of oblique flow has an inclined angle alpha, and this inclined angle alpha is preferably 40 ° ~ 80 °.It is easily understood that, because the diagonal impeller 11 outlet-inclined impeller vane angle of existing inclined flow air compressor 1 is all about 40 ° (as shown in Figure 1 or 2), such aerodynamic arrangement, cause it can only be applicable to the inclined flow air compressor 1 of mesolow ratio, make whole combined compressor be difficult to be applicable to more high pressure ratio scope.Therefore, above-mentioned structure inclined angle alpha being designed to 40 ° ~ 80 °, can ensure that inclined flow air compressor 1 has higher boosting capability.Specifically, by experiment, for the preferable range of 40 ° ~ 80 °, the pressure ratio of inclined flow air compressor 1 can reach 3.0 ~ 7.0:1, also has larger air-flow through-current capability simultaneously, can meet the large discharge operating range of such as 3.0 ~ 30.0kg/s.Certainly, the preferable range of above-mentioned inclined angle alpha is only exemplary illustration, does not affect the present invention in other embodiments, inclined angle alpha is chosen as other angle.
As shown in Figure 3, in the present embodiment, the import of oblique flow Diffuser 12 is connected to the outlet of diagonal impeller 11, and the outlet of oblique flow Diffuser 12 roughly extends towards the direction of the outlet of diagonal impeller 11.According to the preferred value of above-mentioned inclined angle alpha, in conjunction with the structure of oblique flow Diffuser 12 linearly cavity, make oblique flow Diffuser 12 compared with existing structure, under the prerequisite that passage length is certain, axial length shortens further.
As shown in Figure 3, in the present embodiment, centrifugal compressor 2, as the second level in the two-stage of the centrifugal combined compressor of oblique flow, comprises the centrifugal impeller 21 and centrifugal pressure expanding device that connect successively.That is, the outlet of centrifugal impeller 21 is connected to the import of centrifugal pressure expanding device.
As shown in Figure 3, in the present embodiment, return channel 3 is gooseneck shape and is connected between the first order and the second level, and return channel 3 comprises the return channel turnaround section passage 31, return channel blade 32 and the return channel meander sections passage 33 that connect successively.Namely, the import of return channel turnaround section passage 31 is connected to the outlet of oblique flow Diffuser 12, the outlet of return channel turnaround section passage 31 is connected to the import of return channel blade 32, the outlet of return channel blade 32 is connected to the import of return channel meander sections passage 33, and the outlet of return channel meander sections passage 33 is connected to the import of centrifugal impeller 21.
As shown in Figure 3, in the present embodiment, return channel turnaround section passage 31 is curved, when being connected to return channel turnaround section passage 31 to make return channel blade 32, angle β between the bearing of trend of return channel blade 32 and the bearing of trend of oblique flow Diffuser 12 levels off to 0 °, to make to level off to 0 ° by the angle between the airflow direction of return channel blade 32 and the airflow direction of oblique flow Diffuser 12.Further, due to return channel blade 32 linearly type extend structure, its axial length is shorter, and makes return channel blade 32 near the front side of oblique flow Diffuser 12.
It should be noted that, the description of above-mentioned " leveling off to 0 ° " and " front side near oblique flow Diffuser 12 ", refer to and do not considering under the prerequisite that other structures take up room, return channel blade 32 is made to press close to oblique flow Diffuser 12 as much as possible, because return channel 3 is positioned on front side of inclined flow air compressor 1, therefore be described as the front side of return channel blade 32 near oblique flow Diffuser 12.Meanwhile, because oblique flow Diffuser 12 and return channel blade 32 are the structure that straight line type extends, when the angle β therefore between both bearing of trends is 0 °, the axial length of structure is minimum.When considering the taking up room of other structures, namely this idealized design can the mode of a kind of " convergence " or " close " realize, such as, consider the size of return channel turnaround section passage 31, the description of " angle β levels off to 0 ° " can more compatibly be described to " oblique flow Diffuser 12 levels off to parallel with return channel blade 32 ".Said structure design can ensure the phenomenon not occurring flow separation in return channel 3, reduces airflow breakaway loss further.
As shown in Figure 3, in the present embodiment, return channel meander sections passage 33 is curved, to make running shaft 24 direction (namely axially) of airflow direction and the centrifugal impeller 21 flowed out by its outlet identical.
It should be noted that, between above-mentioned inclined flow air compressor 1 and centrifugal compressor 2, the structural design of return channel 3 connection of the short axial length adopted, compared with the two stage centrifugal gas compressor with same design parameter, or the centrifugal combined compressor of oblique flow is compared, its axial dimension can reduce more than 20%, and structure is compacter, significantly can improve rotor dynamics problems.
In addition, in the present embodiment, the inlet diameter of return channel 3 is greater than its outlet diameter, and namely the inlet diameter of return channel turnaround section passage 31 is greater than the outlet diameter of return channel meander sections passage 33.Further, the sectional area of the passage of return channel 3 is the structure of first increases and then decreases from front to back.By said structure, can ensure not occur flow separation in return channel 3, and then reduce airflow breakaway loss.
In addition, in the present embodiment, the air-flow rectification flowed into by inclined flow air compressor 1 can be the pre-rotational gas flow of ± 15 ° by return channel blade 32, and flows into centrifugal compressor 2.It should be noted that, above-mentioned pre-rotational gas flow ± 15 ° of designs, be the air flow demand of prewhirling for meeting needed for centrifugal impeller 21.
It should be noted that shown in accompanying drawing and the centrifugal combined compressor of the oblique flow described in this manual is only to adopt an example in the many kinds of centrifugal combined compressors of oblique flow of the principle of the invention at this.It should be clearly understood that any details of the centrifugal combined compressor of oblique flow that principle of the present invention is only limitted to absolutely not describe shown in accompanying drawing or in this specification or any parts of the centrifugal combined compressor of oblique flow.
Such as, be not intended to principle according to the invention, in the present embodiment, centrifugal pressure expanding device comprises the radial diffuser 22 and axial Diffuser 23 that connect successively.That is, the outlet of centrifugal impeller 21 is connected to the import of radial diffuser 22, and the outlet of radial diffuser 22 is connected to the import of axial Diffuser 23, and above-mentioned radial diffuser 22 is roughly the same with existing structure with axial Diffuser 23, does not repeat them here.In addition, the Way out of centrifugal impeller 21 is radial, to make to flow into the airflow direction of radial diffuser 22 for radial direction by its outlet.
But, not in each mode of execution of the present invention, all centrifugal pressure expanding device must be set to said structure.The concrete set-up mode of centrifugal pressure expanding device, can according to the actual requirements and the concrete structure of the centrifugal combined compressor of oblique flow adjust flexibly.
And for example, be not intended to principle according to the invention, in the present embodiment, the running shaft 13 of diagonal impeller 11 is two running shafts arranged respectively with the running shaft 24 of centrifugal impeller 21, and two running shafts are positioned on straight line.Adopt above-mentioned two to rotate shaft design, the centrifugal combined compressor of oblique flow can be made to obtain higher pressure ratio and efficiency.In addition, those skilled in the art it is easily understood that, except diagonal impeller 11 and centrifugal impeller 21 are except rotating component, such as all the other structures of oblique flow Diffuser 12, return channel 3 (comprising its return channel blade 32) are stator part, can play the effect of rectification and diffusion.
But, not in each mode of execution of the present invention, all the running shaft 13 of diagonal impeller 11 must be designed to arrange respectively and two of conllinear with the running shaft 24 of centrifugal impeller 21.Such as, in other illustrative embodiments of the present invention, diagonal impeller 11 and centrifugal impeller 21 are the structure sharing a running shaft.In addition, diagonal impeller 11 can be also can be reverse in the same way with the sense of rotation of centrifugal impeller 21.Running shaft 13 and the set-up mode of the running shaft 24 of centrifugal impeller 21 of above-mentioned diagonal impeller 11, can adjust flexibly according to the concrete structure of the centrifugal combined compressor of oblique flow and user demand.
Shown in composition graphs 3, the working principle of the centrifugal combined compressor of oblique flow propose the present invention and workflow are described as follows:
When the centrifugal combined compressor 2 of oblique flow that the present invention proposes works, the diagonal impeller 11 that air-flow enters first order inclined flow air compressor 1 carries out rotating boosting, flows into oblique flow Diffuser 12 and carries out rectification.Air-flow by inclined flow air compressor 1 rotating boosting and after rectification, flows in the return channel turnaround section passage 31 of return channel 3, and returns back in return channel blade 32 and carry out rectification and acceleration, then again becomes axis by return channel meander sections passage 33.After air-flow is flowed out by return channel 3, enter the centrifugal impeller 21 of second level centrifugal compressor 2, after centrifugal impeller 21 further supercharging, enter radial diffuser 22 successively and axial Diffuser 23 carries out deceleration diffusion, finally flow into next parts.
Designed by said structure, the centrifugal combined compressor of oblique flow that the present invention proposes, compared to the centrifugal combined compressor of existing oblique flow, simplifies whole flow passage structure, and the wide-angle of air-flow in return channel 3 passage is turned back minimizing, aerodynamic loss is less, and then promotes the whole efficiency of combined compressor.Further, by the structural design of return channel blade 32 on front side of oblique flow Diffuser 12, the axial length of combined compressor is shortened further, and structure is compacter, has more excellent rotor dynamics.In addition, design based on said structure, coordinate the inclined angle alpha between the Way out of diagonal impeller 11 and its running shaft 13 direction to be the structural design of 40 ° ~ 80 ° simultaneously, can ensure that inclined flow air compressor 1 has higher boosting capability and larger air-flow through-current capability, and then the requirement of large discharge operating range and high pressure ratio scope can be met.
Specifically, through verification experimental verification and contrast, the pressure ratio of the inclined flow air compressor 1 of the first order is 3.0 ~ 7.0:1, and the pressure ratio of the centrifugal compressor 2 of the second level is 2.0 ~ 5.0:1, and the overall pressure ratio scope of the centrifugal combined compressor of oblique flow of thus the present invention's proposition can reach 6.0 ~ 35.0:1.Meanwhile, range of flow of the present invention can reach 3.0 ~ 30.0kg/s.In addition, because the axial length of the centrifugal combined compressor of oblique flow of the present invention's proposition is shorter, compared with the centrifugal combined compressor of existing oblique flow with same design parameter, the combined compressor of the comparable bow-backed type aerodynamic arrangement of its axial length shortens 50%, the combined compressor of comparable ultra-compact S type aerodynamic arrangement shortens 20%, structure is compacter, significantly can improve rotor dynamics.
More than describe in detail and/or illustrate exemplary embodiment.But embodiments of the present invention are not limited to particular implementation as described herein, on the contrary, the constituent element of each mode of execution and/or step can be separated with other constituent element as described herein and/or step independent sum and used.Each constituent element of a mode of execution and/or each step also can be combined with other constituent element of other mode of execution and/or step.At introduction described and/or illustrated key element/constituent element here/when waiting, term " ", " one " and " above-mentioned " etc. in order to expression exist one or more key element/constituent element/etc.Term " comprises ", " comprising " and " having " in order to represent the open meaning included and refer to also can to exist except key element/constituent element except listing/wait other key element/constituent element/etc.In addition, the term " first " in claims and specification and " second " etc. only use as mark, are not limit the numeral of its object.
Although invention has been described according to different specific embodiments, it will be recognized by those skilled in the art and can change enforcement of the present invention in the spirit and scope of claim.
Claims (10)
1. the centrifugal combined compressor of oblique flow, comprising:
Inclined flow air compressor (1), as the first order in the two-stage of the centrifugal combined compressor of described oblique flow, comprise the diagonal impeller (11) and oblique flow Diffuser (12) that connect successively, the Way out of described diagonal impeller (11) and the axis of the centrifugal combined compressor of described oblique flow have a tilt angle (α), and the outlet of described oblique flow Diffuser (12) extends towards the direction of the outlet of described diagonal impeller (11);
Centrifugal compressor (2), as the second level in the two-stage of the centrifugal combined compressor of described oblique flow, comprises the centrifugal impeller (21), radial diffuser (22) and the axial Diffuser (23) that connect successively; And
Return channel (3), be connected between the described first order and the described second level in gooseneck shape, described return channel (3) comprises the return channel turnaround section passage (31) connected successively, return channel blade (32) and return channel meander sections passage (33), the import of described return channel turnaround section passage (31) is connected to the outlet of described oblique flow Diffuser (12), described return channel turnaround section passage (31) is curved, to make described return channel blade (32) near described oblique flow Diffuser (12) front side, the outlet of described return channel meander sections passage (33) is connected to the import of described centrifugal impeller (21).
2. the centrifugal combined compressor of oblique flow according to claim 1, the tilt angle (α) between the Way out of described diagonal impeller (11) and its running shaft (13) direction is 40 ° ~ 80 °.
3. the centrifugal combined compressor of oblique flow according to claim 2, angle (β) between the bearing of trend of described return channel blade (32) and the bearing of trend of described oblique flow Diffuser (12) levels off to 0 °, to make to level off to 0 ° by the angle between the airflow direction of described return channel blade (32) and the airflow direction of described oblique flow Diffuser (12).
4. the centrifugal combined compressor of oblique flow according to claim 3, described return channel blade (32) and described oblique flow Diffuser (12) are straight line type, and the extended length of described return channel blade (32) is greater than the extended length of described oblique flow Diffuser (12).
5. the centrifugal combined compressor of oblique flow according to claim 1, the inlet diameter of described return channel (3) is greater than its outlet diameter, and namely the inlet diameter of described return channel turnaround section passage (31) is greater than the outlet diameter of described return channel meander sections passage (33).
6. the centrifugal combined compressor of oblique flow according to claim 5, the sectional area of the passage of described return channel (3) is the structure of first increases and then decreases from front to back.
7. the centrifugal combined compressor of oblique flow according to claim 1, the air-flow rectification that described return channel blade (32) can will be flowed into by described inclined flow air compressor (1) is the pre-rotational gas flow of ± 15 °, and flows into described centrifugal compressor (2).
8. the centrifugal combined compressor of oblique flow according to claim 1, described return channel meander sections passage (33) is curved, identical with running shaft (13) direction of described diagonal impeller (11) to make by the airflow direction of its outlet outflow.
9. the centrifugal combined compressor of oblique flow according to claim 1, described diagonal impeller (11) and described centrifugal impeller (21) are the structure sharing a running shaft.
10. the centrifugal combined compressor of oblique flow according to claim 1, the running shaft (13) of described diagonal impeller (11) and the running shaft (24) of described centrifugal impeller (21) are two running shafts arranged respectively, and described two running shafts are positioned on straight line.
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