A combustion chamber test article bleed air device

Abstract

This application belongs to the field of aero-engines, and specifically relates to a bleed air device for a combustion chamber test piece, comprising: a disc-shaped cover plate, the cover plate including an outer disc surface and an inner disc surface, an annular gas collecting ring installed on the outer edge of the outer disc surface, the gas collecting ring having an annular cavity; the inner disc surface and the bleed air chamber cover plate with a circular groove forming a cylindrical cavity; two channels communicating with the annular cavity through through holes at the same position on the cover plate and the gas collecting ring, the annular cavity communicating with the cylindrical cavity through multiple circumferentially evenly distributed guide bends; the cylindrical cavity communicating with a gas outlet pipe connected to the inner side of the bleed air chamber cover plate; the bleed air device of this application can better simulate the bleed air under the actual engine environment of the combustion chamber test piece, and the number of through holes that can be adjusted by the rotatable gas collecting ring corresponds to different combustion chamber test piece environments.

Description

Technical Field

[0001] This application belongs to the field of aero-engines, and specifically relates to a bleed air device for a combustion chamber test piece. Background Technology

[0002] The design process of an aero-engine combustor requires extensive testing. Generally, to ensure that the test results of the component are comparable to those of the complete engine test, the working process of the combustor needs to be accurately simulated. For example, when designing the test component, the flow path shape of the combustor needs to be consistent with that of the combustor assembled in the complete engine, i.e., geometric similarity. At the same time, it is necessary to perform equivalent simulations of the gas dynamics and combustion science of the combustor inlet parameters based on the capabilities of the test equipment, that is, to keep the dimensionless parameters of the component test consistent with those of the assembled engine during operation. The ability to accurately simulate the airflow and distribution within the two channels of the combustion chamber during component testing is crucial to the consistency between component and overall engine test results. Existing combustion chamber test pieces typically use a simple method of drilling a single row of holes to simulate the flow of turbine cooling air drawn from the two channels of the combustion chamber. However, in the actual state of the entire engine, there are multiple air intake points within the two channels of the combustion chamber, including cooling air for the high-pressure turbine guide vanes and cooling air for the high-pressure turbine disk. These airflows drawn from different locations have a significant impact on the distribution of airflow into the flame tube, particularly on the distribution of airflow mixed with the inner wall of the flame tube and the penetration depth, which adversely affects the accuracy of component test results. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a combustion chamber test piece bleed air device, which is connected to the outlet of the combustion chamber test piece via bolts. The combustion chamber test piece bleed air device is used to bleed gas from two channels during combustion chamber test, and includes:

[0004] The disc-shaped cover plate includes an outer disc surface and an inner disc surface. A circular gas collecting ring with a circular cavity is installed on the outer edge of the outer disc surface. The inner disc surface and the gas duct cover plate with a circular groove form a cylindrical cavity. Two channels are connected to the circular cavity through through holes in the same position as the gas collecting ring. The circular cavity is connected to the cylindrical cavity through multiple circumferentially evenly distributed guide bends. The cylindrical cavity is connected to a gas outlet pipe connected to the inner side of the gas duct cover plate.

[0005] Preferably, the gas outlet tube is located at the center of the inner side of the gas venting chamber cover.

[0006] Preferably, the guide bend is a right-angle bend, with one end inserted into a small hole in the gas collecting ring and the other end inserted into a small hole in the cover plate to connect the annular cavity and the cylindrical cavity.

[0007] Preferably, the guide bends and the through holes are in a one-to-one correspondence in position and number.

[0008] Preferably, the guide bend is made of metal, with one end connected to the gas collecting ring by welding and the other end connected to the cover plate by welding.

[0009] Preferably, the gas collecting ring and the cover plate are connected by welding.

[0010] Preferably, the gas collecting ring includes a disk with an annular outward protrusion on its outer edge, and the interior of the protrusion is hollow to form an annular cavity.

[0011] Preferably, the gas collecting ring and the cover plate are connected by an annular slide rail, so that the gas collecting ring has the freedom of rotation along the axial direction relative to the cover plate. The through hole includes air holes in the cover plate and air holes in the gas collecting ring. The through hole is formed when the air holes in the cover plate and the air holes in the gas collecting ring are located on the same axis. The number of air holes in the cover plate is twice that of the air holes in the gas collecting ring. The disc surface of the gas collecting ring has a first small hole that connects to the guide bend. The cover plate has a second small hole with a number twice that of the first small hole. The second small holes are evenly distributed circumferentially and are located on the same circumference as the first small holes.

[0012] Preferably, the number of through holes is the same as the number of nozzles on the combustion chamber test piece.

[0013] Preferably, the position of the through hole is on the same axial direction as the position of the nozzle of the combustion chamber test piece.

[0014] Preferably, the outer edge of the cover plate 1 has a profile 2 for guiding airflow.

[0015] The advantages of this application include: the induction device of this application can better simulate the bleed air under the actual machine environment of the combustion chamber test piece, and the number of through holes can be adjusted by the rotatable gas collecting ring to correspond to different combustion chamber test piece environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation of the air intake device and the combustion chamber test piece according to a preferred embodiment of this application;

[0017] Figure 2 This is a half-sectional view of the air intake device according to a preferred embodiment of this application;

[0018] Figure 3 This is a front view of a preferred embodiment of the air intake device of this application;

[0019] Figure 4 This is a schematic diagram of the installation of a traditional combustion chamber test piece without an induced draft device;

[0020] Among them, 1-cover plate; 2-airflow guiding surface; 3-air collecting ring; 4-air duct cover plate; 5-gas outlet pipe; 8-guide bend pipe; A-circular cavity; B-cylindrical cavity; C-two-channel cavity. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] This application provides a combustion chamber test piece bleed device, which is connected to the outlet of the combustion chamber test piece by bolts. The combustion chamber test piece bleed device is used to bleed gas from two channels C during combustion chamber test, and includes:

[0023] A disc-shaped cover plate 1 includes an outer disc surface and an inner disc surface. A circular gas collecting ring 3 is installed on the outer edge of the outer disc surface. The gas collecting ring 3 has a circular cavity A. The inner disc surface and the gas duct cover plate 4 with a circular groove form a cylindrical cavity B. Two channels C are connected to the circular cavity A through through holes in the cover plate 1 and the gas collecting ring 3 at the same position. The circular cavity A is connected to the cylindrical cavity B through multiple circumferentially evenly distributed guide bends 8. The cylindrical cavity B is connected to the gas outlet pipe 5 connected to the inner side of the gas duct cover plate 4. The inner diameter of the outlet pipe 5 is calculated according to the amount of gas ducting. A typical value is Φ65mm. The diameter of the gas duct cover plate 4 is Φ300mm and the height is 30mm. The equivalent inner diameter of the gas collecting ring cavity 3 is Φ45mm and the pipe diameter is Φ20mm.

[0024] In some alternative embodiments, the gas outlet pipe 5 is located at the center of the inner side of the gas venting chamber cover plate 4, with an empty space at the center to facilitate gas guidance.

[0025] In some alternative embodiments, the guide bend 8 is a right-angle bend, which facilitates manufacturing. One end of the bend is inserted into a small hole in the gas collecting ring 3, and the other end is inserted into a small hole in the cover plate 1, so that the annular cavity A and the cylindrical cavity B are connected. This connection facilitates single-unit production and installation.

[0026] In some alternative embodiments, the guide bends 8 correspond one-to-one with the through holes in terms of position and number.

[0027] In some alternative embodiments, the guide bend 8 is made of metal, with one end connected to the gas collecting ring 3 by welding and the other end connected to the cover plate 1 by welding.

[0028] In some alternative embodiments, the gas collecting ring 3 is connected to the cover plate 1 by welding.

[0029] In some alternative embodiments, the gas collecting ring 3 includes a disc with an outwardly protruding ring on its outer edge, and the interior of the protrusion is hollow to form an annular cavity A. That is, the gas collecting ring 3 is an integral disc-shaped cover plate 1, which becomes a double-layer structure, making it convenient for installation and processing.

[0030] In some optional embodiments, the gas collecting ring 3 and the cover plate 1 are connected by an annular slide rail, allowing the gas collecting ring 3 to have axial rotational freedom relative to the cover plate 1. The through hole includes air holes in the cover plate 1 and air holes in the gas collecting ring 3. The through hole is formed when the air holes in the cover plate 1 and the air holes in the gas collecting ring 3 are located on the same axis. The number of air holes in the cover plate 1 is twice the number of air holes in the gas collecting ring 3. The disc surface of the gas collecting ring 3 has a first small hole connected to the guide bend 8, and the cover plate 1 has a second small hole with twice the number of the first small hole. The second small holes are circumferentially evenly distributed and connected to the first small hole. The holes are located on the same circumference. That is to say, since the through holes and the guide bends 8 are evenly distributed, when the number of air holes in the cover plate 1 is twice that of the air holes in the gas collecting ring 3, the gas collecting ring 3 can rotate a certain angle to re-form a through hole with the air holes in the cover plate 1. Correspondingly, the first small hole and the second small hole also correspond in the same way. This allows the guide bends 8 to either correspond one-to-one with the fuel nozzle axis to speed up the air intake efficiency, or the guide bends 8 to be located between two adjacent fuel nozzles. This can change the air intake method and thus adapt to different combustion chamber test pieces.

[0031] In some alternative embodiments, the number of through holes is the same as the number of nozzles on the combustion chamber test piece.

[0032] In some alternative embodiments, the position of the through hole is on the same axial direction as the position of the nozzle of the combustion chamber test piece.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A combustion chamber test piece bleed air device, connected to the outlet of the combustion chamber test piece by bolts, the combustion chamber test piece bleed air device being used for bleeding gas from two channels (C) during combustion chamber test piece testing, characterized in that, include: A disc-shaped cover plate (1) includes an outer disc surface and an inner disc surface. A circular gas collecting ring (3) is installed on the outer edge of the outer disc surface. The gas collecting ring (3) has a circular cavity (A). The inner disc surface and the gas duct cover plate (4) with a circular groove form a cylindrical cavity (B). Two channels (C) are connected to the circular cavity (A) through through holes at the same positions on the cover plate (1) and the gas collecting ring (3). The circular cavity (A) is connected to the cylindrical cavity (B) through multiple circumferentially evenly distributed guide bends (8). The cylindrical cavity (B) is connected to a gas outlet pipe (5) connected to the inner side of the gas duct cover plate (4). The ring (3) and the cover plate (1) are connected by an annular slide rail, so that the gas collecting ring (3) has the freedom to rotate axially relative to the cover plate (1). The through hole includes the air hole of the cover plate (1) and the air hole of the gas collecting ring (3). When the air hole of the cover plate (1) and the air hole of the gas collecting ring (3) are located on the same axis, the through hole is formed. The number of air holes of the cover plate (1) is twice that of the air holes of the gas collecting ring (3). The disk surface of the gas collecting ring (3) has a first small hole connected to the guide bend (8). The cover plate (1) has a second small hole with twice the number of the first small hole. The second small hole is evenly distributed circumferentially and is located on the same circumference as the first small hole.

2. The combustion chamber test specimen bleed air device as described in claim 1, characterized in that, The gas outlet tube (5) is located at the center of the inner side of the gas venting chamber cover plate (4).

3. The combustion chamber test piece bleed air device as described in claim 1, characterized in that, The guide bend (8) is a right-angle bend, with one end inserted into the small hole of the gas collecting ring (3) and the other end inserted into the small hole of the cover plate (1) to connect the annular cavity (A) and the cylindrical cavity (B).

4. The combustion chamber test specimen bleed air device as described in claim 1, characterized in that, The guide bend (8) corresponds one-to-one with the position and number of the through holes.

5. The combustion chamber test specimen bleed air device as described in claim 3, characterized in that, The guide bend (8) is made of metal. One end of it is connected to the gas collecting ring (3) by welding, and the other end is connected to the cover plate (1) by welding.

6. The combustion chamber test specimen bleed air device as described in claim 1, characterized in that, The gas collecting ring (3) and the cover plate (1) are connected by welding.

7. The combustion chamber test specimen bleed air device as described in claim 1, characterized in that, The gas collecting ring (3) includes a disk with an annular outward protrusion on the outer edge, and the interior of the protrusion is hollow to form an annular cavity (A).

8. The combustion chamber test specimen bleed air device as described in claim 7, characterized in that, The number of through holes is the same as the number of nozzles on the combustion chamber test piece.

9. The combustion chamber test piece bleed air device as described in claim 1, characterized in that, The position of the through hole is on the same axial direction as the position of the nozzle of the combustion chamber test piece.

Images