A variable flow configuration anti-gas high temperature backflow device and control method thereof

Abstract

The invention relates to the field of aerial environment simulation test equipment for aircraft engines, and discloses a variable flow configuration anti-gas high-temperature backflow device and a control method thereof. The variable flow configuration anti-gas high-temperature backflow device comprises a test cabin, an exhaust diffuser, a retaining ring, and a movable baffle. A through hole is arranged in the retaining ring, and convergent structures with smoothly reduced openings are symmetrically arranged on both sides of the through hole. The movable baffle is used to control the convergent structure to be fully open, fully blocked or partially blocked. The invention can adjust the shape of the through hole according to the test state of an integrated power engine and the change of the test state, and in particular can realize online adjustment of the retaining ring configuration according to the reflux state, so as to ensure that reflux is not easily generated in the transition state, ensure stable operation of the integrated power engine during the test state adjustment process, and avoid the test safety problem caused by the reflux of high-temperature exhaust gas to the test cabin in the aerial environment simulation test with the integrated power engine as a typical application scenario.

Description

Technical Field

[0001] The invention relates to the field of aviation engine air environment simulation test equipment, and discloses a variable flow configuration combustion gas high temperature backflow prevention device and a control method thereof. Background Art

[0002] The nozzle of an aircraft engine integrated power engine (integrated power nozzle) can combine two different power technologies together, integrating the advantages of their respective applicable flight ranges. It has the advantages of horizontal take-off and landing, reusability, high reliability, and good low-speed performance. It can be used as an ideal power unit for various types of aircraft.

[0003] The exhaust of the integrated power nozzle has the characteristic of unilateral expansion, and there are extreme working conditions with strong asymmetry of the gas jet. A larger diameter exhaust diffuser is needed to collect the gas. The resulting larger residual space on both sides of the jet makes it easy for local high-temperature reflux areas to appear in the cabin under some working conditions. The resulting local cabin temperature is too high, which can lead to damage or failure of cabin tests and electrical equipment. Excessive reflux may even affect the quality of the cabin flow field.

[0004] In order to meet the exhaust requirements of the integrated power engine aerial environment simulation test, a backflow prevention device is required to be installed at the inlet of the exhaust diffuser. The integrated power engine has different working modes and conditions. One mode can correspond to a single backflow baffle configuration. The commonly used fixed configuration backflow baffle cannot completely suppress high-temperature backflow under all modes and conditions.

[0005] When the integrated power engine mode is switched, the flow configuration of the backflow baffle must change continuously to prevent the backflow of gas. Therefore, it is unreasonable to simply replace baffles with different fixed configurations. At the same time, the test needs to be stopped when the baffle is replaced, and the test needs to be adjusted to the corresponding state after replacement. The process consumes a lot of energy and human resources. Summary of the invention

[0006] The object of the present invention is to provide a variable flow configuration anti-high temperature backflow device for combustion gas and a control method thereof, which can adjust the shape of the through hole according to the test state of the integrated power engine and the change of the test state to ensure that backflow is not easy to occur in the transition state.

[0007] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0008] A variable flow configuration gas high temperature backflow prevention device, comprising:

[0009] A test cabin, the test cabin is used to install an integrated power nozzle, the integrated power nozzle includes a symmetrical power nozzle assembly and an asymmetrical power nozzle assembly;

[0010] An exhaust diffuser, wherein the inlet end of the exhaust diffuser is connected to the outlet end of the test chamber;

[0011] A retaining ring is arranged near the inlet end of the exhaust diffuser, and a through hole is arranged in the retaining ring for full flow of the integrated power nozzle gas; the middle part of the through hole is a rectangular structure, and convergent structures with smoothly reduced openings are symmetrically arranged on both sides of the rectangular structure;

[0012] There are four movable baffles, which are centrally symmetrically distributed on an axial end face of the retaining ring, wherein every two movable baffles are respectively connected to two split displacement adjustment mechanisms for adjusting the relative position of the corresponding movable baffles and the convergence structure.

[0013] Furthermore, the retaining ring is obtained by splicing two symmetrical C-shaped half-ring components.

[0014] Furthermore, the retaining ring includes an inner layer, an outer layer, and a hollow interlayer arranged between the inner layer and the outer layer.

[0015] Furthermore, a rib plate is provided between the inner layer and the outer layer, the rib plate is welded to the inner wall of the outer layer, and the rib plate is gap-matched with the inner wall of the inner layer.

[0016] Furthermore, the retaining ring is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively connected with a conduit.

[0017] Furthermore, the displacement adjustment mechanism comprises a hydraulic telescopic mechanism, and a telescopic rod of the hydraulic telescopic mechanism is drivingly connected to the movable baffle.

[0018] Furthermore, the displacement adjustment mechanism also includes a guide rail that cooperates with the movable baffle, the guide rail is fixed to the outer periphery of the through hole of the baffle ring, and a roller is arranged between the movable baffle and the guide rail.

[0019] In order to achieve the above technical effects, the present invention also provides a variable flow configuration anti-gas high temperature backflow control method, the control method is based on the variable flow configuration anti-gas high temperature backflow device, comprising:

[0020] Acquire the gas jet test conditions of the integrated power nozzle, wherein the test conditions include symmetrical airflow, asymmetrical airflow and transitional airflow, wherein the transitional airflow is the airflow state during the process of adjusting the symmetrical airflow to the asymmetrical airflow or the asymmetrical airflow to the symmetrical airflow;

[0021] According to the test conditions and changes in the test conditions during the test, the relative position of the movable baffle and the convergence structure is adjusted by using a displacement adjustment mechanism; during the adjustment process, the jet gas of the integrated power nozzle is in a transitional state of gas flow, and the four movable baffles are all adjusted to the periphery of the through hole, so that the through hole is in a full flow state, until the required test conditions are reached, and the relative position of the movable baffle is adjusted according to the required test state; wherein:

[0022] When the test condition is symmetrical airflow, the four movable baffles are symmetrically distributed at the four corners of the through hole to fully block the convergence structure, so that the through hole forms a U-shaped flow channel;

[0023] When the test condition is an asymmetric airflow, the position of the through hole through which the larger jet gas flows is in a fully open state, and the movable baffle at the corresponding position is located at the periphery of the through hole; the position of the through hole through which the smaller jet gas flows is in a closed state, and the movable baffle at the corresponding position partially blocks the convergence structure.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention integrates a retaining ring with a through hole and a movable baffle, and can adjust the shape of the through hole according to the test state of the integrated power engine and the change of the test state. In particular, the retaining ring configuration can be adjusted online according to the reflux state, which can ensure that reflux is not easy to occur in the transition state, ensure the stable operation of the integrated power engine during the test state adjustment process, and avoid the test safety problem caused by the reflux of high-temperature exhaust gas to the test cabin in the air environment simulation test with the integrated power engine as the typical application scenario.

[0026] 2. The present invention can flexibly match the mobile baffle according to the exhaust characteristics of other aircraft engines, so as to realize the online adjustment of the air flow hole configuration of the baffle ring, has good adaptability, avoids the problem of stopping the test when using a fixed configuration baffle and adjusting the test to the corresponding state after replacement, and has the effect of reducing energy and human resource consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a variable flow configuration anti-gas high temperature backflow device in an embodiment;

[0028] Figure 2 Schematic diagram of the positional relationship between the movable baffle and the baffle ring during the transitional state of airflow in the embodiment;

[0029] Figure 3 Schematic diagram of the positional relationship between the movable baffle and the baffle ring during symmetrical airflow in the embodiment;

[0030] Figure 4 Schematic diagram of the positional relationship between the movable baffle and the baffle ring in the case of asymmetric airflow in the embodiment;

[0031] Figure 5 A schematic diagram of the cross-sectional structure of the retaining ring in the embodiment;

[0032] Figure 6 It is a structural schematic diagram of the displacement adjustment mechanism in the embodiment;

[0033] Among them, 1. test cabin; 2. symmetrical power nozzle assembly; 3. asymmetrical power nozzle assembly; 4. exhaust diffuser; 5. retaining ring; 501. C-type semi-ring assembly; 502. inner layer; 503. outer layer; 504. rib plate; 6. through hole; 601. rectangular structure; 602. convergent structure; 7. movable baffle; 8. displacement adjustment mechanism; 801. hydraulic telescopic mechanism; 802. guide rail; 803. roller. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0035] Example

[0036] See also Figure 1 , a variable flow configuration anti-gas high temperature backflow device, comprising:

[0037] A test cabin 1, wherein the test cabin 1 is used to install an integrated power nozzle, wherein the integrated power nozzle comprises a symmetrical power nozzle assembly 2 and an asymmetrical power nozzle assembly 3;

[0038] An exhaust diffuser 4, wherein the inlet end of the exhaust diffuser 4 is connected to the outlet end of the test chamber 1;

[0039] The retaining ring 5 is arranged at a position close to the inlet end of the exhaust diffuser 4, and a through hole 6 is arranged in the retaining ring 5 for full flow of the integrated power nozzle gas; the middle of the through hole 6 is a rectangular structure 601, and the two sides of the rectangular structure 601 are symmetrically provided with convergent structures 602 with smoothly reduced openings;

[0040] The movable baffle 7 is four in number, and the four movable baffles 7 are centrally symmetrically distributed on an axial end face of the retaining ring 5, wherein every two movable baffles 7 are respectively connected to two split displacement adjustment mechanisms 8 for adjusting the relative position of the corresponding movable baffle 7 and the convergence structure 602.

[0041] In this embodiment, a retaining ring 5 with a through hole 6 is integrated with a movable baffle 7, so that the shape of the through hole 6 can be adjusted according to the test state of the integrated power engine and the change of the test state. In particular, the configuration of the retaining ring 5 can be adjusted online according to the reflux state, thereby ensuring that reflux is not easily generated in the transition state, ensuring stable operation of the integrated power engine during the test state adjustment process, and avoiding the test safety problem caused by the reflux of high-temperature exhaust gas to the test cabin 1 in the air environment simulation test with the integrated power engine as the typical application scenario.

[0042] It should be noted that the variable flow configuration anti-high-temperature backflow device for combustion gas of this embodiment can be flexibly matched with the movable baffle 7 according to the exhaust characteristics of other aircraft engines, so as to realize the online adjustment of the configuration of the gas flow hole 6 of the baffle ring 5, and has good adaptability. It avoids the problem that the test needs to be stopped when using a fixed configuration baffle and the test needs to be adjusted to the corresponding state after replacement, thereby having the effect of reducing energy and human resource consumption.

[0043] The variable flow configuration anti-gas high temperature backflow control method process of this embodiment includes:

[0044] Step 1, obtaining the gas jet test conditions of the integrated power nozzle, wherein the test conditions include symmetrical airflow, asymmetrical airflow and transitional airflow, wherein the transitional airflow is the airflow state during the process of adjusting the symmetrical airflow to the asymmetrical airflow or the asymmetrical airflow to the symmetrical airflow;

[0045] Step 2: According to the test conditions and changes in the test conditions during the test, the relative position of the movable baffle 7 and the convergence structure 602 is adjusted by using the displacement adjustment mechanism 8; during the adjustment process, the jet gas of the integrated power nozzle is in a transitional state of gas flow, such as Figure 2 As shown, the four movable baffles 7 are all adjusted to the outer periphery of the through hole 6, so that the through hole 6 is in a full flow state, until the required test conditions are reached, and the relative positions of the movable baffles 7 are adjusted according to the required test conditions; wherein:

[0046] like Figure 3 As shown, when the test condition is symmetrical airflow, the four movable baffles 7 are symmetrically distributed at the four corners of the through hole 6 to completely block the convergence structure 602, so that the through hole 6 forms a U-shaped flow channel to prevent the gas from flowing back;

[0047] like Figure 4 As shown, when the test condition is an asymmetric airflow, the position of the through hole 6 through which the larger jet gas flows is in a fully open state, and the movable baffle 7 at the corresponding position is located on the periphery of the through hole 6; the position of the through hole 6 through which the smaller jet gas flows is in a closed state, and the movable baffle 7 at the corresponding position partially blocks the convergence structure 602.

[0048] In this embodiment, the displacement adjustment mechanism 8 includes a hydraulic telescopic mechanism 801, and the telescopic rod of the hydraulic telescopic mechanism 801 is drivingly connected to the movable baffle 7. When the position of the movable baffle 7 needs to be adjusted, the movable baffle 7 is driven by the hydraulic telescopic mechanism 801 to block or open the gas flow channel to achieve a change in configuration. In addition, the hydraulic telescopic mechanism 801 can also withstand a certain high temperature, and can withstand a temperature of more than 200°C, so as to achieve stable adjustment of the movable baffle 7 in a high temperature environment.

[0049] The retaining ring 5 can be an integral annular structure, and this embodiment adopts two symmetrical C-shaped semi-ring components 501 spliced ​​together. The contact surface of each pair of split movable baffles 7 is designed with a concave-convex wedge structure, which can avoid contact collision when the movable baffles 7 are closed, thereby improving the operating stability. It should be noted that under extreme working conditions where the integrated power nozzle gas jet is highly asymmetric, by moving the upper or lower movable baffles 7 to the periphery of the through hole 6, the flow configuration of the through hole 6 of the anti-backflow retaining ring 5 is made into a double "C" type, thereby achieving full flow of gas.

[0050] like Figure 5 As shown, in this embodiment, the retaining ring 5 includes an inner layer 502, an outer layer 503, and a hollow interlayer arranged between the inner layer 502 and the outer layer 503. The retaining ring 5 structural design of double-layer structure + hollow interlayer can play a dual role of heat insulation and backflow prevention.

[0051] To prevent high-temperature failure, the hollow interlayer inside the retaining ring 5 can be used as a cooling channel. The retaining ring 5 is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively connected to a conduit. In this embodiment, the outer layer 503 is a C-type baffle body with a thickness of 20mm to ensure its rigidity; the hollow interlayer is a water-cooling channel with a thickness of 24mm to ensure its cooling effect; the inner layer 502 is 6mm thick to ensure a smaller temperature difference. It is worth noting that a rib plate 504 is provided between the inner layer 502 and the outer layer 503 of this embodiment, and the rib plate 504 can separate the water-cooling channel, but it is necessary to ensure that the water-cooling channel flow is unobstructed. In order to avoid excessive thermal stress between the inner layer 502 and the rib plate 504, the rib plate 504 of the water-cooling channel is only welded to the inner wall of the outer layer 503.

[0052] like Figure 6 As shown, the displacement adjustment mechanism 8 in this embodiment also includes a guide rail 802 that cooperates with the movable baffle 7. The guide rail 802 is fixed to the outer periphery of the through hole 6 of the retaining ring 5. A roller 803 is provided between the movable baffle 7 and the guide rail 802. It is used to provide support and guidance for the movable baffle 7. The setting of the roller 803 is mainly used for the movable baffle 7 to roll on the guide rail 802, and the friction force is small. When selecting the roller 803, it is necessary to ensure that the roller 803 has a temperature resistance of more than 600°C.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable flow configuration anti-gas high temperature backflow device, characterized in that: include: A test cabin, the test cabin is used to install an integrated power nozzle, the integrated power nozzle includes a symmetrical power nozzle assembly and an asymmetrical power nozzle assembly; An exhaust diffuser, wherein the inlet end of the exhaust diffuser is connected to the outlet end of the test chamber; A retaining ring is arranged near the inlet end of the exhaust diffuser, and a through hole is arranged in the retaining ring for full flow of the integrated power nozzle gas; the middle part of the through hole is a rectangular structure, and convergent structures with smoothly reduced openings are symmetrically arranged on both sides of the rectangular structure; There are four movable baffles, which are centrally symmetrically distributed on an axial end face of the retaining ring, wherein every two movable baffles are respectively connected to two split displacement adjustment mechanisms for adjusting the relative position of the corresponding movable baffles and the convergence structure.

2. The variable flow configuration anti-gas high temperature backflow device according to claim 1, characterized in that: The retaining ring is obtained by splicing two C-shaped half-ring components with symmetrical structures.

3. The variable flow configuration anti-gas high temperature backflow device according to claim 1, characterized in that: The retaining ring comprises an inner layer, an outer layer, and a hollow interlayer arranged between the inner layer and the outer layer.

4. The variable flow configuration anti-gas high temperature backflow device according to claim 3, characterized in that: A rib plate is arranged between the inner layer and the outer layer, the rib plate is welded to the inner wall of the outer layer, and the rib plate is gap-matched with the inner wall of the inner layer.

5. The variable flow configuration anti-gas high temperature backflow device according to claim 3, characterized in that: The retaining ring is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively connected with a conduit.

6. The variable flow configuration anti-gas high temperature backflow device according to claim 1, characterized in that: The displacement adjustment mechanism comprises a hydraulic telescopic mechanism, and the telescopic rod of the hydraulic telescopic mechanism is drivingly connected to the movable baffle.

7. The variable flow configuration anti-gas high temperature backflow device according to claim 1, characterized in that: The displacement adjustment mechanism also includes a guide rail matched with the movable baffle, the guide rail is fixed on the outer periphery of the through hole of the baffle ring, and a roller is arranged between the movable baffle and the guide rail.

8. A variable flow configuration anti-gas high temperature backflow control method, the control method is based on the variable flow configuration anti-gas high temperature backflow device according to claim 1, characterized in that: include: Acquire the gas jet test conditions of the integrated power nozzle, wherein the test conditions include symmetrical airflow, asymmetrical airflow and transitional airflow, wherein the transitional airflow is the airflow state during the process of adjusting the symmetrical airflow to the asymmetrical airflow or the asymmetrical airflow to the symmetrical airflow; According to the test conditions and changes in the test conditions during the test, the relative position of the movable baffle and the convergence structure is adjusted by using a displacement adjustment mechanism; during the adjustment process, the jet gas of the integrated power nozzle is in a transitional state of gas flow, and the four movable baffles are all adjusted to the periphery of the through hole, so that the through hole is in a full flow state, until the required test conditions are reached, and the relative position of the movable baffle is adjusted according to the required test state; wherein: When the test condition is symmetrical airflow, the four movable baffles are symmetrically distributed at the four corners of the through hole to fully block the convergence structure, so that the through hole forms a U-shaped flow channel; When the test condition is an asymmetric airflow, the position of the through hole through which the larger jet gas flows is in a fully open state, and the movable baffle at the corresponding position is located at the periphery of the through hole; the position of the through hole through which the smaller jet gas flows is in a closed state, and the movable baffle at the corresponding position partially blocks the convergence structure.

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