Multifunctional integrated support plate for centrifugal compressor outlet
By designing a multi-functional integrated support plate, optimizing the hub line orientation, and integrating the fuel injection system, the problem of the single function of the axial support plate was solved, achieving the compactness of the aero engine and improving combustion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NORTHWESTERN POLYTECHNICAL UNIV
- Filing Date
- 2026-03-10
- Publication Date
- 2026-05-12
AI Technical Summary
In existing aero engines, the axial support plate and the downstream combustion chamber have long been relatively independent in configuration design, with relatively simple functions, occupying a large space and making it difficult to exert comprehensive efficiency.
A multifunctional integrated support plate is designed, including an annular hub support plate, an annular casing support plate, and a fuel injection system. By optimizing the hub line orientation and integrating the fuel injection system, a diffuser channel and a stable recirculation zone are formed to achieve guiding, deceleration, and combustion functions.
While maintaining the same diffusion ratio, the axial dimension is significantly shortened, the structural layout is made more compact, the airflow deceleration and diffusion effect is enhanced, and a stable combustion function is achieved in the combustion chamber.
Smart Images
Figure CN122014644A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aero-engine technology, and can also be applied to automotive engines, drones, and micro gas turbines with centrifugal compressor axial support plates. Specifically, it relates to a multifunctional integrated support plate for centrifugal compressor outlet and its design method. Background Technology
[0002] Given the broader context of smaller aircraft engines requiring wider airspace, higher speed ranges, and longer ranges, the need for smaller engine dimensions is particularly important.
[0003] Centrifugal compressors and combustion chambers are the two core components of small aero engines. They are typically connected by axial support plates, such as... Figure 7 A schematic diagram of a traditional centrifugal compressor with an axial support plate is given. Figure 7 It can be seen that the main function of the axial support plate is to transform the radial airflow at the centrifugal compressor outlet into axial airflow, creating the necessary conditions for subsequent combustion in the combustion chamber.
[0004] However, due to the limitations of previous aero-engine technology, the axial support plate and the downstream combustion chamber have long been relatively independent in their configuration design, and their functions are relatively simple. They often occupy a large space but fail to achieve the corresponding comprehensive efficiency.
[0005] Therefore, there is a need to provide a multifunctional integrated support plate for the outlet of a centrifugal compressor to solve the above problems. Summary of the Invention
[0006] In view of the problem that, due to the limitations of previous aero-engine technology, the axial support plate and the downstream combustion chamber have long been relatively independent in configuration design, with relatively simple functions, and often fail to exert corresponding comprehensive efficiency while occupying a large space, the present invention provides a multi-functional integrated support plate for the outlet of a centrifugal compressor to solve the existing problems.
[0007] The first aspect of the present invention provides a multifunctional integrated support plate for the outlet of a centrifugal compressor, which adopts the following technical solution, including: The annular hub support plate and the annular casing support plate have an inner ring that gradually shrinks along the airflow direction, and a diffusion channel is formed between the annular hub support plate and the annular casing support plate. Multiple blunt bodies are evenly distributed between the annular hub support plate and the annular casing support plate to form a diffuser channel; And a fuel injection system, comprising: a fuel injector rod, which radially penetrates into each blunt body within the diffuser channel along the outer wall of the annular casing support plate; a plurality of fuel injectors are evenly distributed on the trailing edge surface of the blunt body, and each fuel injector is connected to the corresponding fuel injector rod on the blunt body within the blunt body.
[0008] A further technical solution of the present invention is that the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate is in the range of 0°~15°.
[0009] A further technical solution of the present invention is that the ratio of the outlet area to the inlet area of the diffuser channel is equal to the expansion ratio of the prototype integrated support plate.
[0010] A second aspect of the present invention provides a design method for a multifunctional integrated support plate for the outlet of a centrifugal compressor, comprising: The expansion ratio of the prototype integrated support plate is obtained based on the inlet and outlet areas of the prototype integrated support plate. The expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate is designed based on aerodynamic characteristics and expansion angle range. Based on the axial length of the prototype hub support plate, the inlet height of the axial channel formed between the prototype hub support plate and the casing, the inner radius at the inlet of the prototype hub support plate, the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, and the expansion ratio of the prototype integrated support plate, the inner radius at the outlet of the annular hub support plate and the shortened length of the annular hub support plate relative to the prototype hub support plate are obtained. The length of the annular hub support plate is obtained based on the shortened length of the annular hub support plate relative to the prototype hub support plate, the axial length of the prototype hub support plate, and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate. Based on the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, an integrated support plate is designed. The circumferential distance between two adjacent fuel injection systems is obtained based on the circumference of the inner wall at the outlet of the annular hub support plate and the number of radial diffusers of the centrifugal compressor; the circumferential width of a single fuel injection system is obtained based on the circumferential distance between two adjacent fuel injection systems. Based on the circumferential distance between two adjacent fuel injection systems and the circumferential width of a single fuel injection system, the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate are designed as an integrated support plate.
[0011] A further technical solution of the present invention is that the step of determining the inner ring radius at the outlet of the annular hub support plate is as follows:
[0012] In the formula, This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the inner radius of the ring at the inlet of the annular wheel hub support plate. Indicates the expansion ratio; This indicates the inlet height of the axial channel formed between the prototype hub support plate and the casing, wherein the inner radius of the annular hub support plate inlet is equal to the inner radius of the prototype hub support plate inlet; the inlet height of the diffuser channel is equal to the inlet height of the axial channel formed between the prototype hub support plate and the casing.
[0013] A further technical solution of the present invention is that the shortening length of the annular hub support plate relative to the prototype hub support plate is:
[0014] In the formula, This indicates the length by which the annular hub support plate is shortened relative to the original hub support plate. Indicates the axial length of the prototype hub support plate; Indicates the inner radius of the ring at the inlet of the annular hub support plate; This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate.
[0015] A further technical solution of the present invention is that the circumferential distance between two adjacent fuel injection systems is:
[0016] In the formula, This indicates the circumferential distance between two adjacent fuel injection systems; This indicates the circumference of the inner wall line at the outlet of the annular wheel hub support plate. Indicates the number of radial diffusers in a centrifugal compressor; This indicates the inner radius of the ring at the outlet of the annular hub support plate.
[0017] A further technical solution of the present invention is that the circumferential width of a single fuel injection system is 0.1 to 0.2 times the circumferential distance between two adjacent fuel injection systems.
[0018] The beneficial effects of this invention are: This invention proposes an integrated support plate configuration based on the traditional centrifugal compressor outlet axial support plate configuration. By optimizing the hub line orientation of the axial hub support plate, an effective reduction in axial dimensions is achieved while maintaining the same diffusion ratio as the prototype. Simultaneously, the hub line radius shrinks to a smaller scale, significantly compressing the component space inside the hub line and near the rotation axis, making the overall structure more compact in the radial direction. Furthermore, the combustion chamber fuel injection system is integrated on the blunt body between the hub support plate and the inner wall of the annular casing support plate, forming a stable recirculation zone at the integrated support plate outlet, thereby achieving effective combustion organization. The resulting multifunctional integrated support plate configuration combines guiding, deceleration, and combustion functions.
[0019] Secondly, compared to the expansion of the circumferential blunt body flow channel, the meridional flow channel expansion in this invention provides more significant deceleration and diffusion capabilities. By expanding the hub line of the axial support plate, the deceleration and diffusion effect of the airflow within the support plate can be significantly enhanced. Therefore, while maintaining the same diffusion ratio as the prototype (typically characterized by the area expansion ratio), the axial dimension of the axial support plate can be significantly shortened. As the hub line size develops towards a smaller radius, the radial space is significantly reduced under the same axial dimension, allowing for tighter connections of components close to the engine's rotating shaft. Simultaneously, integrating the fuel injection system located within the combustion chamber into the blunt body within the integrated axial support plate shortens the axial dimension while achieving combustion functionality. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the meridional flow channel at the outlet of a centrifugal compressor with a multi-functional integrated support plate in an embodiment of the present invention; Figure 2 This is a schematic diagram of a centrifugal compressor with a multi-functional integrated support plate in an embodiment of the present invention; Figure 3 This is a schematic diagram comparing the hub support plate lines of the integrated support plate in this embodiment and the prototype integrated support plate. Figure 4 This is a schematic diagram of the outlet section of the integrated support plate in an embodiment of the present invention; Figure 5 This is a front view of a centrifugal compressor with a multi-functional integrated support plate in an embodiment of the present invention; Figure 6 This is a rear view of a centrifugal compressor with a multi-functional integrated support plate in an embodiment of the present invention. Figure 7 This is a schematic diagram of the prototype centrifugal compressor and integrated support plate in an embodiment of the present invention; Figure 8 This is a flowchart illustrating a design method for a multifunctional integrated support plate for the outlet of a centrifugal compressor, as described in an embodiment of the present invention.
[0022] In the diagram: 1. Centrifugal compressor; 2. Rotor blades; 3. Radial diffuser blades; 4. Injector rod; 5. Injector nozzle; 6. Annular casing support plate; 7. Annular hub support plate; 8. Blunt body; 9. Integrated support plate. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] An embodiment of the present invention is a multifunctional integrated support plate for the outlet of a centrifugal compressor, such as... Figure 1 As shown, the system includes: an annular hub support plate 7, an annular casing support plate 6, blunt bodies 8, and a fuel injection system. The inner ring of the annular hub support plate 7 gradually narrows along the airflow direction, and a diffusion channel is formed between the outer wall of the annular hub support plate 7 and the inner wall of the annular casing support plate 6. Multiple blunt bodies 8 are evenly distributed in the diffusion channel formed between the outer wall of the annular hub support plate 7 and the inner wall of the annular casing support plate 6. The fuel injection system includes: a fuel injector 4, which radially penetrates into each blunt body 8 within the diffusion channel along the outer wall of the annular casing support plate 6. Multiple fuel injectors 5 are evenly distributed on the trailing edge surface of the blunt body 8, and each fuel injector 5 communicates with the corresponding fuel injector 4 on the blunt body 8 within the blunt body 8.
[0025] For example, in one specific embodiment, the expansion angle of the annular hub support plate 7 relative to the inner wall of the annular casing support plate 6 ranges from 0° to 15°. For example, in one specific embodiment, the ratio of the outlet area to the inlet area of the diffuser channel is equal to the expansion ratio of the prototype integrated support plate.
[0026] It should be noted that, since the airflow from the centrifugal compressor 1 exits radially, it carries not only a strong circumferential velocity component but also a high radial velocity. This flow characteristic is extremely unfavorable for organized combustion in the subsequent combustion chamber. An axial flow channel with a blunt body 8 is installed behind the centrifugal compressor. This allows the swirling airflow, carrying both circumferential and radial velocity components, to deflect axially after passing through this channel, thus creating favorable conditions for organized combustion in the subsequent combustion chamber. Axial support plates with blunt bodies have long been used for airflow guidance. On the one hand, the axial flow channel guides the airflow, causing its original radial velocity component to gradually deflect and convert into axial velocity within the channel; on the other hand, as the airflow flows around the blunt body, its circumferential velocity component is also effectively weakened and further converted into axial velocity. However, for a long time, axial support plates have limited the development of aero-engines towards miniaturization and compactness due to their large structural space requirements and relatively simple function. This deficiency has also significantly constrained the further improvement of small aero-engine technology. Therefore, in this embodiment, an integrated support plate 9 is installed at the outlet of the centrifugal compressor 1; Figure 1 and Figure 2As shown, the airflow enters the channel between the rotor blades 2 of the centrifugal compressor 1 along the axial direction, then enters the radial channel between the radial diffuser blades 3, and then flows out through the diffuser channel between the annular hub support plate 7 and the annular casing support plate 6 of the integrated support plate.
[0027] It should be noted that, as Figure 4 As shown, Figure 4 This is a schematic diagram of the meridional flow path of the centrifugal compressor with integrated support plate in this embodiment. Figure 4 As can be seen, a diffusion channel is formed between the annular hub support plate 7 and the annular casing support plate 6 in this embodiment, which allows the airflow to obtain the same expansion after passing through the axial support plate with a shorter axial dimension than required; at the same time, the combustion chamber fuel injection system is integrated into the blunt body 8 to form a function of centrifugal compressor outlet guidance, deceleration and combustion.
[0028] like Figure 5 and 6 As shown, the hub line dimension of the modified axial support plate channel proposed in this embodiment is developed towards a smaller radius. Simultaneously, the fuel injection system within the combustion chamber is coupled and integrated into a blunt body within the annular hub support plate. Compared to the traditional configuration of independent centrifugal compressor and combustion chamber in small aero engines (i.e., centrifugal compressor radial diffuser—axial support plate—combustion chamber fuel injection system), this embodiment of the invention significantly shortens the axial dimension of the annular hub support plate while maintaining the same expansion ratio by optimizing the hub line orientation. Simultaneously, by coupling and integrating the combustion chamber fuel injection system within the blunt body between the hub support plate and the annular casing support plate, the structural layout becomes more compact while satisfying flame combustion requirements. The improved integrated axial support plate configuration combines the advantages of axial flow guidance, enhanced diffusion capacity, and stable flame combustion.
[0029] Compared to traditional axial support plates, the integrated support plate of this invention offers the following advantages over the prototype: Compared to the expansion of the circumferential blunt body flow channel, the meridional flow channel expansion in this embodiment provides significantly more deceleration and diffusion capabilities. By expanding the hub line of the axial support plate, the deceleration and diffusion effect of the airflow within the support plate can be significantly enhanced. Therefore, while maintaining the same diffusion ratio as the prototype (typically characterized by the area expansion ratio), the axial dimension of the axial support plate can be significantly shortened. As the hub line size develops towards a smaller radius, the radial space is significantly reduced under the same axial dimension, allowing for tighter connections of components close to the aero-engine's rotating shaft.
[0030] A design method for a multifunctional integrated support plate for the outlet of a centrifugal compressor, such as Figure 8 As shown, the method includes: The expansion ratio of the prototype integrated support plate is obtained based on the inlet and outlet areas of the prototype integrated support plate. The expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate is designed based on aerodynamic characteristics and expansion angle range. Based on the axial length of the prototype hub support plate, the inlet height of the axial channel formed between the prototype hub support plate and the casing, the inner radius at the inlet of the prototype hub support plate, the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, and the expansion ratio of the prototype integrated support plate, the inner radius at the outlet of the annular hub support plate and the shortened length of the annular hub support plate relative to the prototype hub support plate are obtained. The length of the annular hub support plate is obtained based on the shortened length of the annular hub support plate relative to the prototype hub support plate, the axial length of the prototype hub support plate, and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate. Based on the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, an integrated support plate is designed. The circumferential distance between two adjacent fuel injection systems is obtained based on the circumference of the inner wall at the outlet of the annular hub support plate and the number of radial diffusers of the centrifugal compressor; the circumferential width of a single fuel injection system is obtained based on the circumferential distance between two adjacent fuel injection systems. Based on the circumferential distance between two adjacent fuel injection systems and the circumferential width of a single fuel injection system, the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate are designed as an integrated support plate.
[0031] For example, in one specific embodiment, for an integrated support plate, the expansion ratio of the prototype integrated support plate is the ratio of the outlet area of the prototype integrated support plate to the inlet area of the prototype integrated support plate. Since the inlet area and outlet area of the prototype integrated support plate are equal, the expansion ratio of the prototype integrated support plate is 1.
[0032] For the integrated support plate in this embodiment, its expansion ratio is:
[0033]
[0034] In the formula, such as Figure 3 As shown, Expansion ratio; This refers to the inlet area of the integrated support plate in this embodiment; This refers to the outlet area of the integrated support plate in this embodiment; This indicates the inlet height of the axial channel formed between the prototype hub support plate and the casing. This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the inner radius of the ring at the inlet of the hub support plate.
[0035] For example, in one specific embodiment, the step of obtaining the inner radius at the outlet of the annular wheel hub support plate is as follows:
[0036] In the formula, This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the inner radius of the ring at the inlet of the annular wheel hub support plate. Indicates the expansion ratio; This indicates the inlet height of the axial channel formed between the prototype hub support plate and the casing, wherein the inner radius of the annular hub support plate inlet is equal to the inner radius of the prototype hub support plate inlet; the inlet height of the diffuser channel is equal to the inlet height of the axial channel formed between the prototype hub support plate and the casing.
[0037] For example, in one specific embodiment, the shortened length of the annular hub support plate relative to the prototype hub support plate is:
[0038] In the formula, This indicates the length by which the annular hub support plate is shortened relative to the original hub support plate. Indicates the axial length of the prototype hub support plate; Indicates the inner radius of the ring at the inlet of the annular hub support plate; This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate.
[0039] For example, in one specific embodiment, such as Figure 4 As shown, the fuel injection system is arranged within the bluff body, which is uniformly distributed between the casing and the hub support plate. The number of fuel injection systems corresponds to the number of bluff bodies, which in turn corresponds to the number of radial diffusers in the centrifugal compressor. Therefore, the relevant structural parameters of the fuel injection system can be calculated. Wherein, it is assumed that the number of radial diffusers in the centrifugal compressor is The circumference of the inner wall at the outlet of the annular hub support plate is: Therefore, the circumferential distance between two adjacent fuel injection systems can be obtained as follows:
[0040] In the formula, This indicates the circumferential distance between two adjacent fuel injection systems; This indicates the circumference of the inner wall line at the outlet of the annular wheel hub support plate. Indicates the number of radial diffusers in a centrifugal compressor; Indicates the inner radius at the outlet of the annular hub support plate; circumferential width of a single fuel injection system. l It should be 0.1~0.2 .
[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A multifunctional integrated support plate for the outlet of a centrifugal compressor, characterized in that, include: The annular hub support plate and the annular casing support plate have an inner ring that gradually shrinks along the airflow direction, and a diffusion channel is formed between the annular hub support plate and the annular casing support plate. Multiple blunt bodies are evenly distributed between the annular hub support plate and the annular casing support plate to form a diffuser channel; And a fuel injection system, comprising: a fuel injector rod, which radially penetrates into each blunt body within the diffuser channel along the outer wall of the annular casing support plate; a plurality of fuel injectors are evenly distributed on the trailing edge surface of the blunt body, and each fuel injector is connected to the corresponding fuel injector rod on the blunt body within the blunt body.
2. The multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 1, characterized in that, The expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate ranges from 0° to 15°.
3. The multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 1, characterized in that, The ratio of the outlet area to the inlet area of the diffuser channel is equal to the expansion ratio of the prototype integrated support plate.
4. A design method for a multifunctional integrated support plate for the outlet of a centrifugal compressor, characterized in that, include: The expansion ratio of the prototype integrated support plate is obtained based on the inlet and outlet areas of the prototype integrated support plate. The expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate is designed based on aerodynamic characteristics and expansion angle range. Based on the axial length of the prototype hub support plate, the inlet height of the axial channel formed between the prototype hub support plate and the casing, the inner radius at the inlet of the prototype hub support plate, the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, and the expansion ratio of the prototype integrated support plate, the inner radius at the outlet of the annular hub support plate and the shortened length of the annular hub support plate relative to the prototype hub support plate are obtained. The length of the annular hub support plate is obtained based on the shortened length of the annular hub support plate relative to the prototype hub support plate, the axial length of the prototype hub support plate, and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate. Based on the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate, an integrated support plate is designed. The circumferential distance between two adjacent fuel injection systems is obtained based on the circumference of the inner wall at the outlet of the annular hub support plate and the number of radial diffusers of the centrifugal compressor; the circumferential width of a single fuel injection system is obtained based on the circumferential distance between two adjacent fuel injection systems. Based on the circumferential distance between two adjacent fuel injection systems and the circumferential width of a single fuel injection system, the length of the annular hub support plate and the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate are designed as an integrated support plate.
5. The design method of a multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 4, characterized in that, The steps for determining the inner ring radius at the outlet of the annular hub support plate are as follows: In the formula, This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the inner radius of the ring at the inlet of the annular wheel hub support plate. Indicates the expansion ratio; This indicates the inlet height of the axial channel formed between the prototype hub support plate and the casing, wherein the inner radius of the annular hub support plate inlet is equal to the inner radius of the prototype hub support plate inlet; the inlet height of the diffuser channel is equal to the inlet height of the axial channel formed between the prototype hub support plate and the casing.
6. The design method of a multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 4, characterized in that, The shortening length of the annular hub support plate relative to the original hub support plate is: In the formula, This indicates the length by which the annular hub support plate is shortened relative to the original hub support plate. This indicates the axial length of the prototype hub support plate; Indicates the inner radius of the inlet of the annular hub support plate; This indicates the inner radius of the ring-shaped hub support plate outlet. This indicates the expansion angle of the annular hub support plate relative to the inner wall of the annular casing support plate.
7. The design method of a multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 4, characterized in that, The circumferential distance between two adjacent fuel injection systems is: In the formula, This indicates the circumferential distance between two adjacent fuel injection systems; This indicates the circumference of the inner wall line at the outlet of the annular wheel hub support plate. Indicates the number of radial diffusers in a centrifugal compressor; This indicates the inner radius of the ring at the outlet of the annular hub support plate.
8. The design method of a multifunctional integrated support plate for the outlet of a centrifugal compressor according to claim 7, characterized in that, The circumferential width of a single fuel injection system is 0.1 to 0.2 times the circumferential distance between two adjacent fuel injection systems.