CN115992822A - Rotary stamping diagonal flow centrifugal combined compressor and application thereof - Google Patents
Rotary stamping diagonal flow centrifugal combined compressor and application thereof Download PDFInfo
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- CN115992822A CN115992822A CN202310081715.3A CN202310081715A CN115992822A CN 115992822 A CN115992822 A CN 115992822A CN 202310081715 A CN202310081715 A CN 202310081715A CN 115992822 A CN115992822 A CN 115992822A
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Abstract
The invention provides a rotary stamping diagonal flow centrifugal combined compressor and application thereof, and belongs to the technical field of turbine engines. Compared with the compression mode of the conventional combined compressor, the invention uses the supercharging mode of the supersonic air inlet passage to lead the Mach number of the air flow relative to the rotating impeller to be more than 2 by high-speed rotation, and a series of weak oblique shock waves are constructed by the shrinkage of the passage at the moment, and the efficient compression system is obtained by the supercharging of the shock wave system, so that the single-stage pressure ratio is far higher than that of the conventional compressor, and the invention has compact structure, simple processing and long service life.
Description
Technical Field
The invention belongs to the technical field of turbine engines, and particularly relates to a rotary stamping diagonal flow centrifugal combined compressor and application thereof.
Background
The centrifugal compressor has the technical characteristics of compact structure, high step pressure ratio and wide stable working range, the tangential speed of the outlet of the centrifugal impeller at present reaches 680m/s, and the design of the structural strength and the service life of the compressor is provided with serious challenges. As shown in figure 1, the existing combined compressor adopts a three-stage axial flow compressor a and a one-stage centrifugal compressor b to be connected together, combines the characteristics of large inlet flow adaptation of an axial flow stage and small flow adaptation of a centrifugal stage, high single-stage pressure ratio and wide stable working range, and can meet the dual requirements of flow and pressure ratio. The axial flow progression of the conventional combined compressor is changed along with the change of the pressure ratio, and the pressure ratio is realized by three-stage axial flow and one-stage centrifugation on the order of 15.
However, in order to further increase the pressure ratio, the existing combined compressor can increase the tangential speed of the impeller outlet on one hand, but the tangential speed limited by materials cannot be increased in an infinite way, the total pressure ratio has limited lifting potential, in addition, the high tangential speed is unfavorable to the structural strength and service life of the compressor, on the other hand, the number of stages of the axial flow compressor can be increased, but the number of stages of the compressor is increased, the size, weight, number of parts and processing time of the compressor are all increased, and finally, the current design method of the axial flow compressor limits the speed of the air flow, so that the single-stage pressure ratio is larger and generally not more than 2.2.
Disclosure of Invention
Aiming at the problems, the invention provides a rotary stamping diagonal flow centrifugal combined compressor and application thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a rotary stamping diagonal flow centrifugal combined compressor comprises an outer casing structure, an inner casing structure, a working mechanism and a diffusion mechanism;
the outer casing structure and the inner casing structure are revolution bodies;
the inner casing structure is positioned in the outer casing structure, and the inner casing structure and the outer casing structure form a working cavity;
the working mechanism is arranged in the working cavity and is used for pressurizing air flow;
the outer casing structure and the inner casing structure are connected with one end of the diffusion mechanism;
the diffusion mechanism comprises a first diffuser and a second diffuser, wherein the first diffuser is used for diffusing along the radial direction of the outer casing structure, and the second diffuser is used for diffusing along the axial direction of the outer casing structure.
Preferably, the outer casing structure comprises a first outer casing, a second outer casing, a third outer casing, a fourth outer casing and a fifth outer casing which are sequentially connected;
the inner casing structure comprises a first inner casing, a second inner casing and a third inner casing;
the first inner casing is positioned inside the first outer casing and the second outer casing;
the second inner casing is positioned on the inner side of the fourth outer casing and is connected with the second inner casing;
the third inner casing is located inside the fifth outer casing.
Preferably, the working mechanism comprises adjustable guide vanes, a punching rotor, stator blades and a centrifugal impeller;
the adjustable guide vane is arranged between the second outer casing and the first inner casing;
the punching rotor is positioned on the inner side of the third outer casing and between the first inner casing and the second inner casing;
the stator blades are arranged between the fourth outer casing and the second inner casing;
the centrifugal impeller is mounted between the fifth outer casing and the third inner casing.
Preferably, a drain hole is formed in the surface of the third outer casing, and the drain hole faces the punching rotor.
Preferably, a gas collection chamber is further arranged on the outer side of the third outer casing, and a switch is arranged on the surface of the gas collection chamber and used for opening or closing the gas collection chamber.
Preferably, the gas collection chamber is overlapped with two ends of the third outer casing.
Preferably, the diffusion mechanism comprises a first housing and a second housing;
one end of the first shell is connected with a fifth outer casing;
the second shell is connected with one end, far away from the fifth outer casing, of the first shell.
Preferably, the first housing overlaps the second housing.
Preferably, the first housing is disposed along a radial direction of the fifth outer casing, and the second housing is disposed along an axial direction of the fifth outer casing.
Preferably, the first diffuser is mounted inside the first housing and the second diffuser is mounted inside the second housing.
An application of a rotary stamping diagonal flow centrifugal combined compressor is used for a gas turbine engine;
the gas turbine engine includes a reverse flow combustor and a single stage axial flow turbine;
one end of the backflow combustion chamber is connected with the rotary stamping diagonal flow centrifugal combined compressor, and the other end of the backflow combustion chamber is connected with the single-stage axial flow turbine.
The invention has the beneficial effects that:
1. compared with the compression mode of a conventional combined compressor, the invention uses the supercharging mode of the supersonic air inlet channel to enable the Mach number of the air flow relative to the rotating impeller to be more than 2 through high-speed rotation, a series of weak oblique shock waves are constructed through the shrinkage of the channel at the moment, the single-stage pressure ratio of the efficient compression system is far higher than that of the conventional compressor through the supercharging of the shock wave system, and the efficient compression system has the advantages of compact structure, simplicity in processing and long service life;
2. after the punching section, adding an oblique flow or centrifugal compressor to do work further by utilizing centrifugal force, and increasing the total pressure ratio of the compressor;
3. the single-stage pressure ratio of the rotary stamping diagonal flow centrifugal combined compressor is far higher than that of a conventional axial flow compressor, and when the pressure ratio is further increased, the rotary stamping diagonal flow centrifugal combined compressor can be realized by only increasing the relative Mach number of the air flow at the air inlet of the stamping section;
4. the invention realizes the flow and pressure ratio effects of the original 3-stage axial flow and 1-stage centrifugation by using the working mechanism in a one-stage punching and one-stage centrifugation structure, greatly reduces the axial length, weight and part number of the compressor, and simultaneously greatly reduces the processing time due to the small number of blades (about three common blades) of the rotary punching compressor.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the construction of a conventional combined compressor according to the present invention;
FIG. 2 shows a schematic structural diagram of a rotary stamping diagonal flow centrifugal combined compressor of the present invention;
FIG. 3 shows a model diagram of the working mechanism of the present invention;
FIG. 4 shows a Mach number cloud schematic of the ram section of the combined compressor of the present invention;
FIG. 5 shows a Mach number schematic of a centrifugal compressor in a combined compressor of the present invention;
FIG. 6 shows a graph I of the calculation and test characteristic lines of the rotary stamping diagonal flow/centrifugal combined compressor of the invention;
FIG. 7 shows a second graph of comparison of calculation and test characteristic lines of the rotary stamping diagonal flow/centrifugal combined compressor of the invention;
FIG. 8 shows a model diagram of a rotary ramjet centrifugal combined compressor of the present invention;
FIG. 9 shows a physical view of the stamped rotor of the present invention;
FIG. 10 illustrates a block diagram of a gas turbine engine.
In the figure: 1. a first outer casing; 2. a second outer casing; 3. a third outer casing; 301. a drain hole; 4. a fourth outer casing; 5. a fifth outer casing; 6. a first inner casing; 7. a second inner casing; 8. a third inner casing; 9. an adjustable guide vane; 10. punching the rotor; 11. stator blades; 12. a centrifugal impeller; 13. a plenum chamber; 14. a first housing; 15. a second housing; 16. a first diffuser; 17. a second diffuser; 18. a return flow combustion chamber; 19. a single stage axial flow turbine.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to break through a new-configuration air compressor with compact structure, high efficiency (low entropy increase) and high pressure ratio, the invention provides a rotary stamping diagonal flow centrifugal combined air compressor, which comprises an outer casing structure, an inner casing structure, a working mechanism and a diffusion mechanism; wherein the outer casing structure and the inner casing structure are both revolution bodies; the inner casing structure is positioned in the outer casing structure, and the inner casing structure and the outer casing structure form a working cavity; the working mechanism is arranged in the working cavity and used for pressurizing air flow, and the outer casing structure and the inner casing structure are connected with one end of the diffusion mechanism.
The outer casing structure and the inner casing structure are generally formed by a plurality of shells, and may be integrally formed, and are both solid of revolution structures, so that the outer casing structure and the inner casing structure are generally coaxially arranged, and a duct through which air flows can pass is formed therebetween, and the rotary stamping diagonal flow centrifugal combined air compressor of the invention is specifically described below with reference to the accompanying drawings.
As shown in fig. 2, the outer casing structure includes a first outer casing 1, a second outer casing 2, a third outer casing 3, a fourth outer casing 4, and a fifth outer casing 5 connected in sequence; the fixed connection can be carried out by lap joint, welding and the like. The inner casing structure comprises a first inner casing 6, a second inner casing 7 and a third inner casing 8; the first inner casing 6 is located inside the first outer casing 1 and the second outer casing 2, and the sections of the first inner casing and the second outer casing are both long and arranged along the axial direction. The second inner casing 7 is located inside the fourth outer casing 4 and is connected with the second inner casing 7, and the sections of the second inner casing 7 and the fourth outer casing 4 are arc-shaped structures, and the included angle between the second inner casing 7 and the fourth outer casing 4 and the axial direction is 25-45 degrees. The third inner casing 8 is located inside the fifth outer casing 5, and the fifth outer casing 5 and the third inner casing 8 form an arc-shaped duct, and the structure of the duct is bent radially from the axial direction.
Further, in fig. 2, the working mechanism comprises adjustable guide vanes 9, a punching rotor 10, stator blades 11 and a centrifugal impeller 12; wherein the adjustable guide vane 9 is installed between the second outer casing 2 and the first inner casing 6; the punching rotor 10 is positioned inside the third outer casing 3 and between the first inner casing 6 and the second inner casing 7; the stator vanes 11 are installed between the fourth outer casing 4 and the second inner casing 7; the centrifugal impeller 12 is mounted between the fifth outer casing 5 and the third inner casing 8.
It should be noted that, as shown in fig. 3, which is a model corresponding to the working mechanism of the present invention, it can be seen from the figure that the center of the working mechanism is provided with a shaft, wherein the blades of the punching rotor 10 and the centrifugal impeller 12 are sequentially arranged on the shaft, the adjustable guide vanes 9 and the stator blades 11 are all in the shape of sheets and uniformly distributed on the casing, the blades of the punching rotor 10 are in the shape of spiral blades, are spirally distributed along the axial direction, and the centrifugal impeller 12 is formed by a plurality of sheet-shaped blades and is integrally in the shape of a circular truncated cone.
Further, in fig. 2, a drain hole 301 is formed on the surface of the third outer casing 3, the drain hole 301 faces the punching rotor 10, a gas collection chamber 13 is further disposed outside the third outer casing 3, a switch is disposed on the surface of the gas collection chamber 13, the switch is used for opening or closing the gas collection chamber 13, and the gas collection chamber 13 is overlapped with two ends of the third outer casing 3.
It should be noted that, when the drain hole 301 is opened, a portion of the air flow passing through the punching rotor 10 may enter the air collection chamber 13, and the air flow in the air collection chamber 13 may be released through the opening. At low rotational speeds, the ram compressor shock wave is not yet fully established and is susceptible to a surge condition, so that it is necessary to open the bleed holes 301 to bleed some of the gas to prevent surge.
Further, the diffusion mechanism comprises a first shell 14, a second shell 15, a first diffuser 16 and a second diffuser 17, wherein the first diffuser 16 is used for diffusing along the radial direction of the outer casing structure, and the second diffuser 17 is used for diffusing along the axial direction of the outer casing structure; specifically, one end of the first casing 14 is connected to the fifth outer casing 5, the second casing 15 is overlapped with one end of the first casing 14 away from the fifth outer casing 5, the first casing 14 is radially arranged along the fifth outer casing 5, the second casing 15 is axially arranged along the fifth outer casing 5, the first diffuser 16 is installed inside the first casing 14, and the second diffuser 17 is installed inside the second casing 15.
It should be noted that, the air flow is decelerated and pressurized in the first diffuser 16, and then the air flow is converted into a near axial direction by the second diffuser 17 in the axial direction, so that the air flow is convenient to be combusted in the combustion chamber later.
The invention further provides enough counter-preswirl for the rotary punching compressor by utilizing the adjustable guide vane 9, so that the relative Mach number of the punching rotor 10 is increased to be more than 2, a series of shock wave systems are generated when supersonic airflow flows through the channel similar to the binary supersonic air inlet channel at the front half section of the rotor, and the purpose of reducing and boosting the airflow is realized by utilizing the shock wave systems; the punched air flow is converted into an axial direction through a large-angle stator blade 11 in the punching section so as to be matched with a centrifugal diagonal flow/centrifugal compressor conveniently; the stator is further acted by the inclined flow/centrifugal compressor by utilizing centrifugal force, the total pressure ratio of the compressor is increased, and meanwhile, the air flow is decelerated and diffused by the radial diffuser and the axial diffuser. The flow and pressure ratio of the conventional 3-stage axial flow and 1-stage centrifugal combined compressor can be realized in a compact size by rotary stamping and diagonal flow/centrifugation, the number of parts, processing time and cost are greatly reduced, and a feasible way is explored for the compressor parts of the engine with high power-to-weight ratio in the future.
The cloud diagram of the internal shock wave structure of the rotary stamping section of the rotary stamping diagonal flow centrifugal compressor obtained through simulation is shown in fig. 4, and the cloud diagram shows that the Mach number at the 50% of the expansion height is 2.0, and the internal shock wave structure is gradually pressurized after a series of weak shock wave system decelerations.
As shown in FIG. 5, an internal Mach number cloud diagram of a centrifugal section of the rotary stamping diagonal flow centrifugal compressor obtained through simulation is provided, and the highest Mach number in the centrifugal compressor is 1.0, and is gradually reduced to about 0.25 through a radial diffuser and an axial diffuser.
As shown in fig. 6, the flow pressure ratio of the simulation and the physical test is compared, wherein the curve represented by CFD (computational fluid dynamics) is the simulation result, DP represents the test result of the physical test, and the simulation curve and the test curved surface are substantially identical.
Similarly, as shown in fig. 7, the flow efficiency comparison results of the simulation and the physical test are given, and the simulation curve and the test curved surface are basically identical.
As shown in fig. 8, there are respectively provided compressor assembly drawings in which the drain holes 301 are disposed obliquely with respect to the axial direction and the air outlet is directed to the upper left in the drawing.
As shown in fig. 9, which is a rotor physical diagram, it is apparent from the drawing that the punching rotor 10 and the centrifugal impeller 12 are driven by a shaft.
As shown in fig. 10, the rotary ramjet centrifugal combined compressor is for a gas turbine engine including a reverse flow combustor 18 and a single stage axial flow turbine 19; wherein one end of the backflow combustion chamber 18 is connected with the rotary stamping diagonal flow centrifugal combined compressor, and the other end is connected with the single-stage axial flow turbine 19.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. The rotary stamping diagonal flow centrifugal combined compressor is characterized by comprising an outer casing structure, an inner casing structure, a working mechanism and a diffusion mechanism;
the outer casing structure and the inner casing structure are revolution bodies;
the inner casing structure is positioned in the outer casing structure, and the inner casing structure and the outer casing structure form a working cavity;
the working mechanism is arranged in the working cavity and is used for pressurizing air flow;
the outer casing structure and the inner casing structure are connected with one end of the diffusion mechanism;
the diffusion mechanism comprises a first diffuser (16) and a second diffuser (17), wherein the first diffuser (16) is used for diffusing along the radial direction of the outer casing structure, and the second diffuser (17) is used for diffusing along the axial direction of the outer casing structure.
2. The rotary stamping diagonal flow centrifugal combined compressor of claim 1, wherein the outer casing structure comprises a first outer casing (1), a second outer casing (2), a third outer casing (3), a fourth outer casing (4) and a fifth outer casing (5) which are connected in sequence;
the inner casing structure comprises a first inner casing (6), a second inner casing (7) and a third inner casing (8);
the first inner casing (6) is positioned at the inner sides of the first outer casing (1) and the second outer casing (2);
the second inner casing (7) is positioned at the inner side of the fourth outer casing (4) and is connected with the second inner casing (7);
the third inner casing (8) is positioned inside the fifth outer casing (5).
3. A rotary stamped diagonal flow centrifugal combined compressor according to claim 2, characterized in that the working mechanism comprises adjustable guide vanes (9), a stamped rotor (10), stator blades (11) and a centrifugal impeller (12);
the adjustable guide vane (9) is arranged between the second outer casing (2) and the first inner casing (6);
the punching rotor (10) is positioned on the inner side of the third outer casing (3) and between the first inner casing (6) and the second inner casing (7);
the stator blades (11) are arranged between the fourth outer casing (4) and the second inner casing (7);
the centrifugal impeller (12) is arranged between the fifth outer casing (5) and the third inner casing (8).
4. A rotary ramjet centrifugal combined compressor according to claim 3, characterized in that the surface of the third outer casing (3) is provided with a drain hole (301), the drain hole (301) being directed towards the ram rotor (10).
5. The rotary stamping diagonal flow centrifugal combined compressor according to claim 4, wherein a gas collection chamber (13) is further arranged on the outer side of the third outer casing (3), and a switch is arranged on the surface of the gas collection chamber (13) and used for opening or closing the gas collection chamber (13).
6. A rotary ram diagonal flow centrifugal combined compressor according to claim 5, wherein the plenum (13) overlaps both ends of the third outer casing (3).
7. A rotary ramjet centrifugal combined compressor according to claim 1, wherein the diffuser mechanism comprises a first housing (14) and a second housing (15);
one end of the first shell (14) is connected with the fifth outer casing (5);
the second shell (15) is connected with one end of the first shell (14) far away from the fifth outer casing (5).
8. A rotary ramjet centrifugal combined compressor according to claim 7, wherein the first housing (14) overlaps the second housing (15).
9. A rotary ramjet centrifugal combined compressor according to claim 7, characterized in that said first housing (14) is radially arranged along a fifth outer casing (5) and said second housing (15) is axially arranged along the fifth outer casing (5).
10. The rotary ramjet centrifugal combined compressor according to claim 7, wherein the first diffuser (16) is mounted inside the first housing (14) and the second diffuser (17) is mounted inside the second housing (15).
11. Use of a rotary ramjet centrifugal combined compressor according to any of claims 1-10 for a gas turbine engine;
the gas turbine engine comprises a reverse flow combustor (18) and a single stage axial flow turbine (19);
one end of the backflow combustion chamber (18) is connected with the rotary stamping diagonal flow centrifugal combined compressor, and the other end of the backflow combustion chamber is connected with the single-stage axial flow turbine (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081715.3A CN115992822A (en) | 2023-02-07 | 2023-02-07 | Rotary stamping diagonal flow centrifugal combined compressor and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081715.3A CN115992822A (en) | 2023-02-07 | 2023-02-07 | Rotary stamping diagonal flow centrifugal combined compressor and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115992822A true CN115992822A (en) | 2023-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310081715.3A Pending CN115992822A (en) | 2023-02-07 | 2023-02-07 | Rotary stamping diagonal flow centrifugal combined compressor and application thereof |
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|---|---|
| CN (1) | CN115992822A (en) |
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- 2023-02-07 CN CN202310081715.3A patent/CN115992822A/en active Pending
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