Double-channel air inlet mixing rectifying device

Abstract

The invention provides a double-channel air inlet mixing rectifying device which comprises an inner culvert high-temperature air flow channel, an inner culvert rectifying cone is fixedly arranged at an inner culvert outlet of the inner culvert high-temperature air flow channel, and the head structure of the inner culvert rectifying cone is obtuse; a flow channel of the outer culvert rectifying cavity comprises a first-stage outer culvert rectifying plate, a second-stage outer culvert rectifying plate, a third-stage outer culvert rectifying plate and a fourth-stage outer culvert rectifying plate, airflow holes are formed in the first-stage outer culvert rectifying plate so that the flow channel can be divided into a first-stage rectifying cavity and a second-stage rectifying cavity, airflow holes are formed in the second-stage outer culvert rectifying plate so that the flow channel can be divided into a second-stage rectifying cavity and a third-stage rectifying cavity, and airflow holes are formed in the third-stage rectifying cavity. An outer culvert inlet of the outer culvert rectifying cavity is formed in the first-stage rectifying cavity; the multiple third-stage outer culvert rectifying plates are evenly arranged in the flow channel in the circumferential direction so that the flow channel can be divided into a third-stage rectifying cavity and a fourth-stage rectifying cavity, and the multiple fourth-stage outer culvert rectifying plates are evenly arranged at an outlet of the fourth-stage rectifying cavity in the circumferential direction. The air flow field uniformity of the inner culvert outlet and the outer culvert outlet of the device is improved, and the afterburner test piece inlet flow field requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of tests on afterburner components of aero-engines, and particularly to a dual-channel air intake mixing and rectifying device. Background Art

[0002] The intake indexes of modern advanced aero-engine afterburners are constantly improving, represented by parameters such as pressure, temperature, and flow rate. The operating conditions are becoming increasingly complex and harsh, which poses challenges to the design of afterburner intake devices. The original intake rectifying devices for afterburner tests are increasingly unable to meet the test requirements, resulting in distortion of the inlet air flow of the afterburner test piece that does not meet the test requirements, and having a relatively obvious negative impact on the reliability of test data.

[0003] The structure of a typical dual-channel air intake mixing and rectifying device is as Figure 1 shown. During the working process, the high-temperature gas in the core enters the core high-temperature gas flow path of the rectifying device through the core inlet, is rectified by the core rectifying cone, and then flows out of the rectifying device through the core outlet, and finally enters the core of the afterburner test piece. The bypass air enters the bypass rectifying cavity through the bypass inlet, is depressurized and rectified, then enters the annular channel and flows out through the bypass outlet, and finally enters the bypass of the afterburner test piece. During this process, there are often distortions when the core gas and the bypass gas enter the test piece after passing through the rectifying device. Among them, the core mainly has radial distortion, manifested as a relatively thick boundary layer or separation layer generated near the inner cone, and the bypass mainly has circumferential distortion, with a higher total pressure at the outlet on the same side as the bypass inlet and a lower total pressure at the outlet on the opposite side of the bypass inlet. The existence of distortion inevitably has a negative impact on the validity of the performance test data of the afterburner test piece.

[0004] To solve this problem, the generally adopted means include optimizing the inner cone surface structure and adding a primary rectifying plate in the bypass rectifying cavity. However, with the improvement of the combustion chamber performance, parameters such as the air flow rate and flow velocity at the core outlet have increased. Simply relying on optimizing the inner cone surface is gradually insufficient to effectively reduce the distortion of the core outlet air flow. The primary rectifying plate in the bypass rectifying cavity can also no longer meet the requirements and is not sufficient to reduce the distortion degree of the bypass outlet air flow to a negligible level. The commonly used method is to reduce the effective flow area of the rectifying plate and increase the pressure difference before and after the rectifying plate to improve the uniformity of the bypass outlet air flow, but this will increase the requirement for the air supply pressure and greatly increase the test cost; another method is to increase the volume of the rectifying cavity and achieve the purpose of reducing the distortion of the bypass outlet air flow by improving the air flow uniformity in front of the rectifying plate, but this will cause an increase in the volume of the device, resulting in difficult installation or even complete inability to install. Summary of the Invention

[0005] In view of this, an embodiment of the present application provides a dual-channel intake mixing and rectifying device, which uses an extended inner rectifying cone and a multi-stage outer rectifying structure to achieve efficient rectification of the inner and outer airflows of the device, improve the uniformity of the airflow fields at the inner and outer outlets of the device, and meet the requirements of the inlet airflow field of the afterburner test piece.

[0006] The embodiment of the present application provides the following technical solutions: A dual-channel intake mixing and rectifying device, comprising:

[0007] An inner high-temperature airflow passage, an inner rectifying cone is fixedly arranged at the inner outlet of the inner high-temperature airflow passage, and the head structure of the inner rectifying cone is blunt;

[0008] An outer rectifying cavity, the flow passage of the outer rectifying cavity respectively includes a first-stage outer rectifying plate, a second-stage outer rectifying plate, a third-stage outer rectifying plate and a fourth-stage outer rectifying plate. Airflow holes are arranged on the first-stage outer rectifying plate to divide the flow passage into a first-stage rectifying cavity and a second-stage rectifying cavity. Airflow holes are arranged on the second-stage outer rectifying plate to divide the flow passage into a second-stage rectifying cavity and a third-stage rectifying cavity. The outer inlet of the outer rectifying cavity is arranged on the first-stage rectifying cavity; The number of the third-stage outer rectifying plates is multiple and is circumferentially and uniformly arranged in the flow passage to divide the flow passage into a third-stage rectifying cavity and a fourth-stage rectifying cavity. The number of the fourth-stage outer rectifying plates is multiple and is circumferentially and uniformly arranged at the outlet of the fourth-stage rectifying cavity. The outlet of the fourth-stage rectifying cavity serves as the outer outlet, so that the outer air enters from the first-stage rectifying cavity at the bottom of the outer rectifying cavity, enters the second-stage rectifying cavity after being rectified by the first-stage outer rectifying plate, then enters the third-stage rectifying cavity after being rectified by the second-stage outer rectifying plate, then enters the fourth-stage rectifying cavity after being rectified by the third-stage outer rectifying plate, and finally is discharged after being rectified by the fourth-stage outer rectifying plate.

[0009] According to an embodiment of the present application, the inner rectifying cone includes a conical head and a straight section, and the axial length L of the straight section is greater than or equal to 2 times the distance between the wall surface of the straight section and the inner wall surface.

[0010] According to an embodiment of the present application, the first-stage outer rectifying plate and the second-stage outer rectifying plate are arranged perpendicular to each other and are both perpendicular to the flow direction of the outer airflow.

[0011] According to an embodiment of the present application, the third-stage outer rectifying plate and the fourth-stage outer rectifying plate are both parallel to the flow direction of the outer airflow.

[0012] According to an embodiment of the present application, among the first-stage outer rectifying plate, the second-stage outer rectifying plate, the third-stage outer rectifying plate and the fourth-stage outer rectifying plate, the ratio of the airflow passage area of the nth-stage outer rectifying plate to the airflow passage area of the (n + 1)th-stage outer rectifying plate is 1 - 1.25.

[0013] According to an embodiment of the present application, the ratio between the flow path length and the flow path height of the four-stage rectification cavity formed by the three-stage outer annulus rectification plate ≥ 10.

[0014] According to an embodiment of the present application, the inner annulus rectification cone is fixed to the wall surface of the inner annulus high-temperature gas flow path by inner annulus rectification cone fixing bolts evenly distributed in the circumferential direction at the front and rear stages.

[0015] According to an embodiment of the present application, the cross-sectional area of the first-stage rectification cavity is at least 3 times the cross-sectional areas of the second-stage rectification cavity and the third-stage rectification cavity respectively.

[0016] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification at least include:

[0017] (1) The dual-channel intake mixing device of the embodiments of the present invention can meet the requirements of the inlet flow field uniformity of the afterburner test piece within a relatively wide operating condition range, effectively ensuring the accuracy of the measurement result data obtained from the afterburner test. In a certain type of afterburner test, the distortion index at the inner annulus outlet of the existing mixing device is higher than 1%, and even exceeds 2% in some operating conditions, and the distortion index at the outer annulus outlet is higher than 0.8%; while using the dual-channel intake mixing device described in this patent, the distortion index at the inner annulus outlet measured under higher operating conditions is less than 0.4%, and the distortion index at the outer annulus outlet is less than 0.2%.

[0018] (2) The structural strength of the intake mixing device is improved, and it can be applied to the afterburner test conditions with higher pressure, higher temperature, and larger flow rate. After the existing intake mixing device described in the previous item undergoes a pressure test of about 500 kPa, bulges and weld cracks appear in local areas of the wall surface structure of the outer annulus rectification cavity, while the mixing device described in this patent remains structurally intact after being debugged at a pressure of 1 MPa and a formal test pressure above 800 kPa, without obvious deformation or damage.

[0019] (3) Significantly reduces the test cost. The intake mixing device of the embodiments of the present invention has a price similar to that of the existing structure mixing device, but has a wider applicable operating condition range, higher structural strength, and its service life has also increased several times, its test efficiency has been significantly improved, and the test cost has been significantly reduced. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a typical existing dual-channel intake mixing and rectifying device;

[0022] Figure 2 It is a schematic structural diagram of the dual-channel intake mixing and rectifying device according to the embodiment of the present invention;

[0023] In the figure: 1 - inner annulus inlet, 2 - inner annulus high-temperature gas flow path, 3 - outer annulus outlet, 4 - inner annulus rectifying cone, 5 - inner annulus outlet, 6 - outer annulus rectifying cavity, 7 - outer annulus inlet; 8 - third-stage outer annulus rectifying plate, 9 - second-stage outer annulus rectifying plate, 10 - first-stage outer annulus rectifying plate, 11 - fourth-stage outer annulus rectifying plate, 12 - inner annulus rectifying cone fixing bolt. Specific embodiments

[0024] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0025] The following illustrates the implementation manners of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the scope of protection of the present application.

[0026] As Figure 2 shown, the embodiment of the present invention provides a dual-channel intake mixing and rectifying device, including:

[0027] An inner annulus high-temperature gas flow path 2, an inner annulus rectifying cone 4 is fixedly arranged at the inner annulus outlet 5 of the inner annulus high-temperature gas flow path 2, and the head structure of the inner annulus rectifying cone 4 is blunt;

[0028] The outer bypass rectifying cavity 6, the flow path of the outer bypass rectifying cavity 6 respectively includes a first-stage outer bypass rectifying plate 10, a second-stage outer bypass rectifying plate 9, a third-stage outer bypass rectifying plate 8 and a fourth-stage outer bypass rectifying plate 11. Airflow holes are provided on the first-stage outer bypass rectifying plate 10 to divide the flow path into a first-stage rectifying cavity and a second-stage rectifying cavity. Airflow holes are provided on the second-stage outer bypass rectifying plate 9 to divide the flow path into a second-stage rectifying cavity and a third-stage rectifying cavity. The outer bypass inlet 7 of the outer bypass rectifying cavity 6 is arranged on the first-stage rectifying cavity; the number of the third-stage outer bypass rectifying plates 8 is multiple, and they are circumferentially and uniformly arranged in the flow path to divide the flow path into a third-stage rectifying cavity and a fourth-stage rectifying cavity. The number of the fourth-stage outer bypass rectifying plates 11 is multiple, and they are circumferentially and uniformly arranged at the outlet of the fourth-stage rectifying cavity. The outlet of the fourth-stage rectifying cavity serves as the outer bypass outlet 3, so that the outer bypass air enters from the first-stage rectifying cavity at the bottom of the outer bypass rectifying cavity 6, enters the second-stage rectifying cavity after being rectified by the first-stage outer bypass rectifying plate 10, then enters the third-stage rectifying cavity after being rectified by the second-stage outer bypass rectifying plate 9, then enters the fourth-stage rectifying cavity after being rectified by the third-stage outer bypass rectifying plate 8, and finally is discharged after being rectified by the fourth-stage outer bypass rectifying plate 11.

[0029] In an embodiment of the present invention, the inner bypass rectifying cone 4 includes a conical head and a straight section, and the axial length L of the straight section is greater than or equal to 2 times the distance between the wall surface of the straight section and the inner bypass wall surface. The inner bypass rectifying cone 4 is fixed on the wall surface of the inner bypass high-temperature gas flow path 2 by two levels of circumferentially uniformly distributed inner bypass rectifying cone fixing bolts 12. The head of the inner bypass rectifying cone 4 is blunt, which can provide a better rectifying and distortion-reducing effect for the inner bypass gas flow in the large state.

[0030] In an embodiment of the present invention, the first-stage outer bypass rectifying plate 10 and the second-stage outer bypass rectifying plate 9 are perpendicularly arranged to each other and are both perpendicular to the flow direction of the outer bypass air flow; the third-stage outer bypass rectifying plate 8 and the fourth-stage outer bypass rectifying plate 11 are both parallel to the flow direction of the outer bypass air flow.

[0031] In an embodiment of the present invention, among the first-stage outer bypass rectifying plate 10, the second-stage outer bypass rectifying plate 9, the third-stage outer bypass rectifying plate 8 and the fourth-stage outer bypass rectifying plate 11, the ratio of the air flow passage area of the nth-stage outer bypass rectifying plate to the air flow passage area of the (n + 1)th-stage outer bypass rectifying plate is 1 - 1.25. The air flow passage area of the outer bypass rectifying plates decreases step by step, which can effectively improve the rectifying effect.

[0032] In an embodiment of the present invention, the ratio of the flow path length to the flow path height of the fourth-stage rectifying cavity formed by the third-stage outer bypass rectifying plates is ≥10. The cross-sectional area of the first-stage rectifying cavity is at least 3 times the cross-sectional areas of the second-stage rectifying cavity and the third-stage rectifying cavity respectively.

[0033] A dual-channel intake mixing and rectifying device according to an embodiment of the present invention rectifies the internal flow of the rectifying device using an extended internal rectifying cone with a blunt head, and rectifies the external flow of the rectifying device using a reflux-type external flow passage and a multi-stage external rectifying structure; the high-temperature internal flow passage 2 of the rectifying device is a straight-through type, and the high-temperature internal gas enters from the front, passes through the internal rectifying cone 4 and is discharged from the rear and enters the afterburner test piece; the external rectifying cavity 6 of the rectifying device is a folded type, and the external gas enters from the bottom and passes through the first-stage external rectifying plate 10, the second-stage external rectifying plate 9, the third-stage external rectifying plate 8, and the fourth-stage external rectifying plate 11 and is discharged from the rear, and enters the afterburner test piece together with the high-temperature internal gas.

[0034] The center of the structure of the dual-channel intake mixing and rectifying device is the high-temperature internal flow passage 2. The front end of the flow passage is the internal intake 1. An internal rectifying cone 4 is installed at the coaxial position of the rear part of the flow passage and is fixed on the wall of the high-temperature internal flow passage by the front and rear two-stage circumferentially distributed internal rectifying cone fixing bolts 12. The high-temperature internal gas enters the high-temperature internal flow passage 2 through the circular internal intake 1, and finally flows out of the rectifying device through the annular internal outlet 5 after being rectified by the internal rectifying cone 4 and enters the afterburner test piece; the external rectifying cavity 6 with a conical overall structure is surrounded outside the internal flow passage. The bottom of the rectifying cavity is the external intake 7. There are multi-stage rectifying plates in the rectifying cavity in the order of external gas flow from front to back. Among them, the first-stage external rectifying plate 10 and the second-stage external rectifying plate 9 are perpendicular to the external gas flow direction, and the third-stage external rectifying plate 8 and the fourth-stage external rectifying plate 11 are parallel to the external gas flow direction. The rear part of the fourth-stage external rectifying plate is the external outlet 3 of the rectifying device.

[0035] In the embodiment of the present invention, the external rectifying cavity 6 is a multi-stage folded type with multi-stage rectifying plates inside, which can significantly improve the air flow uniformity at the external outlet 3 without significantly increasing the structural size of the external rectifying cavity. Specifically, when implemented, the material of the internal rectifying cone 4 is a high-temperature alloy, which can adapt to a higher internal flow temperature. The internal rectifying cone 4 can be extended in length, which can better rectify the internal gas. The third-stage external rectifying plate 8 can be extended in length, which can better rectify the external gas and strengthen the structural strength of the wall of the external rectifying cavity at the same time. The dual-channel intake mixing device is installed on the front pipeline of the afterburner test piece.

[0036] The working process of the dual-channel intake mixing and rectifying device according to the embodiments of the present invention is as follows: The rectifying device is installed on the front pipeline of the afterburner test piece as required. The core flow enters the core high-temperature gas channel 2 through the core inlet 1. After being rectified by the core rectifying cone 4, it enters the afterburner test piece connected to the rectifying device through the core outlet 5. The bypass air enters the bypass rectifying cavity 6 through the bypass inlet 7, flows forward through the first-stage bypass rectifying plate 10, then flows towards the axis of the mixing device through the second-stage bypass rectifying plate 9, then flows backward through the third-stage bypass rectifying plate 8, and finally enters the afterburner test piece connected to the rectifying device through the fourth-stage bypass rectifying plate 11 and the bypass outlet 3.

[0037] The core solution of the dual-channel intake mixing and rectifying device according to the embodiments of the present invention is to optimize the core rectifying cone structure, extend the flow path length of the bypass air channel and increase the rectifying plates: changing the installation of the core rectifying cone from the test piece to the intake mixing and rectifying device can significantly increase the overall length of the rectifying cone. At the same time, optimizing the head structure of the windward surface of the rectifying cone can reduce its disturbance to the high-temperature core gas flowing at high speed. Tests prove that this solution can effectively improve the air flow uniformity at the core outlet; by setting multiple rectifying plates in the bypass rectifying cavity, changing the flow direction of the bypass air inside the bypass rectifying cavity, so that the bypass air first flows forward through the first-stage rectifying plate after entering the rectifying cavity, then flows inward through the second-stage rectifying plate, and then flows backward through the third-stage rectifying plate. This extends the flow path length of the bypass air flow, and at the same time, the existence of multiple rectifying plates can also make the air flow with original circumferential distortion gradually uniform during the flow process to the greatest extent.

[0038] Secondly, changing the cylindrical bypass rectifying cavity structure of the existing mixing device to a conical bypass rectifying cavity structure reduces the planar structure size. At the same time, the existence of multiple bypass rectifying plates divides the bypass rectifying cavity, which not only plays a role in rectifying but also strengthens the outer wall of the rectifying cavity, effectively improving the structural strength of the bypass rectifying cavity of the mixing device.

[0039] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A dual-channel intake air mixing and rectifying device, characterized in that, Comprising: An inner high-temperature gas flow path, an inner flow rectifying cone is fixedly arranged at the inner outlet of the inner high-temperature gas flow path, and the head structure of the inner flow rectifying cone is blunt; An outer flow rectifying cavity, the flow path of the outer flow rectifying cavity respectively includes a first-stage outer flow rectifying plate, a second-stage outer flow rectifying plate, a third-stage outer flow rectifying plate and a fourth-stage outer flow rectifying plate. Air flow holes are arranged on the first-stage outer flow rectifying plate to divide the flow path into a first-stage rectifying cavity and a second-stage rectifying cavity. Air flow holes are arranged on the second-stage outer flow rectifying plate to divide the flow path into a second-stage rectifying cavity and a third-stage rectifying cavity. The outer inlet of the outer flow rectifying cavity is arranged on the first-stage rectifying cavity; the number of the third-stage outer flow rectifying plates is multiple and is circumferentially and uniformly arranged in the flow path to divide the flow path into a third-stage rectifying cavity and a fourth-stage rectifying cavity. The number of the fourth-stage outer flow rectifying plates is multiple and is circumferentially and uniformly arranged at the outlet of the fourth-stage rectifying cavity. The outlet of the fourth-stage rectifying cavity serves as the outer outlet, so that the outer air enters from the first-stage rectifying cavity at the bottom of the outer flow rectifying cavity, enters the second-stage rectifying cavity after being rectified by the first-stage outer flow rectifying plate, then enters the third-stage rectifying cavity after being rectified by the second-stage outer flow rectifying plate, then enters the fourth-stage rectifying cavity after being rectified by the third-stage outer flow rectifying plate, and finally is discharged after being rectified by the fourth-stage outer flow rectifying plate.

2. The dual-channel intake air mixing and rectifying device according to claim 1, wherein The inner flow rectifying cone includes a conical head and a straight section, and the axial length L of the straight section is greater than or equal to 2 times the distance between the wall surface of the straight section and the inner wall surface.

3. The dual-channel intake air mixing and rectifying device according to claim 1, wherein The first-stage outer flow rectifying plate and the second-stage outer flow rectifying plate are arranged perpendicular to each other and are both perpendicular to the flow direction of the outer air flow.

4. The dual-channel intake mixing and rectifying device according to claim 1, characterized in that: The third-stage outer flow rectifying plate and the fourth-stage outer flow rectifying plate are both parallel to the flow direction of the outer air flow.

5. The dual-channel intake air mixing and rectifying device according to claim 1, characterized in that Among the first-stage outer flow rectifying plate, the second-stage outer flow rectifying plate, the third-stage outer flow rectifying plate and the fourth-stage outer flow rectifying plate, the ratio of the air flow passage area of the nth-stage outer flow rectifying plate to the air flow passage area of the (n + 1)th-stage outer flow rectifying plate is 1 - 1.

25.

6. The dual-channel intake air mixing and rectifying device according to claim 1, wherein, The ratio of the flow path length to the flow path height of the fourth-stage rectifying cavity formed by the third-stage outer flow rectifying plate is ≥10.

7. The dual-channel intake mixing and rectifying device according to claim 1, characterized in that: The inner flow rectifying cone is fixed on the wall surface of the inner high-temperature gas flow path by inner flow rectifying cone fixing bolts which are circumferentially distributed in two levels before and after.

8. The dual-channel intake air mixing and rectifying device according to claim 1, characterized in that The cross-sectional area of the first-stage rectifying cavity is at least 3 times the cross-sectional areas of the second-stage rectifying cavity and the third-stage rectifying cavity respectively.

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