A turbofan engine intake and exhaust simulation device

Abstract

The present invention provides an intake and exhaust simulation device for a turbofan engine. The intake and exhaust simulation device comprises: an outer liner body and an inner liner body; a fan turbine assembly, which is arranged inside the outer liner body and comprises a fan section and a turbine section; and a fan flow measurement rake for measuring the flow inside the outer liner body; an inner flow measurement rake for measuring the flow inside the inner liner body. The intake and exhaust simulation device comprises a high-pressure intake port section and a low-pressure exhaust port section, which are respectively connected to the turbine section, wherein the high-pressure intake port section is used to pass high-pressure gas into the turbine section as a driving air source, and the low-pressure exhaust port is arranged to allow the exhaust gas of the turbine section to pass out through a low-pressure exhaust device. A low-pressure exhaust device is introduced into the turbine section of the intake and exhaust simulation device of the present invention to generate a low-pressure back pressure, thereby realizing the closed-loop operation of the turbine-driven airflow and ensuring that the total intake and exhaust mass flow of the turbine section in the simulation device remains consistent.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft intake and exhaust simulation tests, and in particular to an intake and exhaust simulation device for an aircraft turbofan engine. Background Art

[0002] During the flight of an aircraft, the intake and exhaust characteristics of a turbofan engine will have an aerodynamic effect on the outer surface of the nacelle and the aircraft body, which is part of the aircraft's drag. Currently, the most reliable method is to use a turbine powered simulator (TPS) to simulate the engine's intake and exhaust and measure the aircraft drag it causes.

[0003] The turbine power simulation device mainly includes a turbine, a fan, etc. The high-pressure air source is guided through an external pipeline to drive the turbine of the turbine part to rotate. The rotating shaft connecting the turbine and the blade part drives the blade part to rotate under the drive of the turbine to simulate the engine intake.

[0004] The existing turbine power simulation device technology mainly drives the turbine through an external high-pressure air source, while driving the inlet pressure boost characteristics of the curved fan blade. The high-pressure air source is discharged from the inner duct after passing through the turbine, and the inlet airflow of the blade is discharged from the outer duct.

[0005] However, there are some problems with the existing turbine power simulation device. In the traditional turbine power simulation device, the high-pressure air source passing through the turbine is all discharged from the inner duct, and the blade inlet flow is all discharged through the outer duct. The blade inlet flow of the real engine is discharged through the outer duct and the inner duct respectively. The similarity between the engine lip inlet flow characteristics and the outer duct flow characteristics (flow, speed) is the key to simulating the impact of engine power. Therefore, in order to ensure that the outer duct flow is similar to that of the real engine, the traditional TPS brings about the problem that the blade inlet flow is smaller than that of the real engine, resulting in a deviation in the pressure distribution of the lip. Therefore, it is necessary to modify the lip to ensure that the lip pressure distribution is similar to that of the real engine and reduce the lip inlet area.

[0006] The lip modification can only ensure that the lip pressure distribution under a single engine condition is similar to that of the real engine, but under other conditions within the engine operating envelope, the lip modification will cause the pressure distribution to be different from that of the real engine. In addition, under large angles of attack, the lip modification will cause the lower lip position to separate earlier, resulting in intake distortion and thrust loss.

[0007] Traditional turbine power simulation devices are driven only by an inlet high-pressure air source, and the outlet back pressure is the ambient pressure. The turbine speed is limited by the pressure drop ratio, which results in the blade part compression ratio (speed) being limited, and it is impossible to achieve the high compression ratio of the real engine at maximum takeoff thrust.

[0008] In addition, under various real engine operating conditions, the actual flow ratio between the inner and outer ducts of a turbofan engine changes, but traditional turbine power simulation devices cannot adjust it.

[0009] Therefore, it is necessary to provide a turbine power simulation device that can avoid lip modification. In addition, it is also hoped that the pressure ratio of the blade part can be improved. On the other hand, it is also expected that the ratio of the inner and outer bypass flow passages can be adjusted so as to simulate various real bypass ratios more accurately. Summary of the invention

[0010] In order to overcome the deficiencies of the prior art, the present invention provides an intake and exhaust simulation device for a turbofan engine, comprising: an outer closure body; an inner closure body, the inner closure body being at least partially arranged within the outer closure body, a fan turbine assembly, the fan turbine assembly being arranged inside the outer closure body and comprising a fan portion and a turbine portion; and a fan flow measuring rake, the fan flow measuring rake being arranged inside the outer closure body to measure the flow inside the outer closure body; an inner closure flow measuring rake, the inner closure flow measuring rake being arranged inside the inner closure body to measure the flow inside the inner closure; wherein the intake and exhaust simulation device comprises a high-pressure intake port portion and a low-pressure exhaust port portion, the high-pressure intake port portion and the low-pressure exhaust port portion being respectively connected to the turbine portion, wherein the high-pressure intake port portion is used to pass high-pressure gas into the turbine portion as a driving gas source, and the low-pressure exhaust port portion is arranged to allow the exhaust gas of the turbine portion to pass out through the low-pressure exhaust device.

[0011] According to one aspect of the present invention, the turbine section includes a turbine box and a turbine arranged in the turbine box, the high-pressure intake port section is at least arranged at a first position on the front side of the turbine in the turbine box, and the low-pressure exhaust port section is at least arranged at a second position on the rear side of the turbine in the turbine box, wherein all the exhaust gas of the turbine section passes through the low-pressure exhaust port section.

[0012] According to another aspect of the present invention, the high-pressure intake port is connected to a high-pressure air source, and the low-pressure exhaust port is connected to a low-pressure suction device, and the high-pressure air source, the high-pressure intake port, the interior of the turbine box, the low-pressure exhaust port and the low-pressure suction device form a closed-loop reflux of the driving air source of the turbine.

[0013] According to another aspect of the present invention, the intake and exhaust simulation device further includes a bracket, and the bracket is respectively attached to the outer body, the inner body and the fan turbine assembly.

[0014] According to another aspect of the present invention, the high-pressure air intake port portion and the low-pressure exhaust port portion include a high-pressure interface and a low-pressure interface located on the bracket, and the high-pressure interface and the low-pressure interface are configured to attach a high-pressure air source and a low-pressure suction device respectively.

[0015] According to another aspect of the present invention, the intake and exhaust simulation device also includes an adjustable tail cone assembly, which is fixedly connected to the rear end of the turbine part, and the adjustable tail cone assembly includes a tail cone body and a tail cone adjustment device, and the adjustment device is configured to adjust the position of the tail cone body relative to the inner body.

[0016] Preferably, the coccyx adjusting device comprises a motor and a telescopic screw, wherein the motor is connected to the telescopic screw for passing through the telescopic screw, and the telescopic screw is attached to the coccyx body to drive the coccyx body to move.

[0017] Preferably, for the intake and exhaust simulation device with an adjustable tail cone assembly, the internal flow measurement rake is arranged between the tail cone body of the adjustable tail cone assembly and the internal body.

[0018] According to another aspect of the present invention, the turbine box includes a high-pressure air chamber, a multi-stage turbine and a low-pressure air chamber, the high-pressure air intake port is connected to the high-pressure air chamber, and the low-pressure exhaust port is connected to the low-pressure air chamber.

[0019] According to another aspect of the present invention, the fan flow measurement rake is located downstream of the fan section, the fan section includes a blade section and a fan cover surrounding the blade section, and the fan section is arranged inside the outer shroud body adjacent to the front end of the outer shroud body.

[0020] The low-pressure back pressure mechanism is introduced into the turbine part of the intake and exhaust simulation device of the present invention, realizing the closed-loop operation of the turbine-driven airflow, so that the total intake and exhaust mass flow of the turbine part in the simulation device remains consistent, which can avoid the lip modification of the simulation device and ensure that the lip pressure distribution under various engine working conditions is similar. Due to the addition of the low-pressure back pressure structure, a larger pressure difference can be provided, thereby effectively increasing the rotation speed of the turbine and improving the pressure ratio of the blade part.

[0021] The intake and exhaust simulation device of the present invention also has an adjustable tail cone assembly, which controls the external bypass flow rate by adjusting the internal bypass flow rate, and can simulate various actual bypass ratios of a real engine in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings, in which:

[0023] Figure 1A stereoscopic view of an intake and exhaust simulation device for a turbofan engine according to a preferred embodiment of the present invention is shown.

[0024] Figure 2 A cross-sectional view of an intake and exhaust simulation device for a turbofan engine according to a preferred embodiment of the present invention is shown.

[0025] Figure 3 A schematic block diagram of the principles of an intake and exhaust simulation device for a turbofan engine according to a preferred embodiment of the present invention is shown.

[0026] Reference numerals list

[0027] 1 Intake and exhaust simulation device

[0028] 10 Connotation ontology

[0029] 20 Connotation Ontology

[0030] 11 Fan flow measurement rake

[0031] 21 Internal flow measurement rake

[0032] 30 Fan turbine assembly

[0033] 31 Fan Department

[0034] 311 Fan cover

[0035] 312 Blade

[0036] 32 Turbine

[0037] 321 Turbine Case

[0038] 322 Turbine

[0039] 325 High pressure air chamber

[0040] 326 Low pressure air cavity

[0041] 33 Shaft

[0042] 40 Coccyx assembly

[0043] 41 Adjustment device

[0044] 411 Telescopic Screw

[0045] 412 Motor

[0046] 42 Coccyx body

[0047] 51 High pressure air intake port

[0048] 52 Low pressure exhaust port

[0049] 60 Hanging rack DETAILED DESCRIPTION

[0050] The present invention is further described below in conjunction with specific embodiments and drawings. More details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention can obviously be implemented in many other ways different from the description.

[0051] In the following description, the term "front end / front part" refers to the end or part close to the upstream with reference to the airflow direction when the intake and exhaust simulation device is conducting a simulation test, and the term "rear end / rear part" refers to the end or part close to the downstream with reference to the airflow direction when the intake and exhaust simulation device is conducting a simulation test.

[0052] Figure 1 FIG. 1 shows a perspective view of an intake and exhaust simulation device 1 for a turbofan engine according to a preferred embodiment of the present invention, and FIG. Figure 2 A longitudinal cross-sectional view of an intake and exhaust simulation device 1 for a turbofan engine according to a preferred embodiment of the present invention is shown. The intake and exhaust simulation device 1 mainly includes an outer enclosure body 10, an inner enclosure body 20 and a fan turbine assembly 30. The inner enclosure body 20 is sleeved within the outer enclosure body 10, and a portion of the inner enclosure body 20 extends outside the outer enclosure body 10.

[0053] The rear end of the fan turbine assembly 30 is also equipped with a tail cone body 42. Figure 2 As shown, the tail vertebra body 42 is surrounded by the inner body 20, and the space between them forms an inner duct. In this way, in the wind tunnel experiment, part of the gas sucked by the fan part 31 will leave from the rear of the simulation device 1 through the outer duct, and the other part of the gas will leave the simulation device 1 through the inner duct.

[0054] In order to measure the air flow rate of the outer duct and the inner duct respectively in the wind tunnel experiment, the intake and exhaust simulation device also includes a fan flow measurement rake 11 and an inner flow measurement rake 21, which are used to measure the air flow rate through the outer duct and the inner duct respectively during the wind tunnel simulation test.

[0055] Furthermore, if Figure 2As shown, the fan turbine assembly 30 in the intake and exhaust simulation device 1 is basically completely arranged in the space formed by the outer shroud body. The fan turbine assembly 30 mainly includes a fan part 31 and a turbine part 32, and a rotating shaft 33 connecting the fan part 31 and the turbine part 32. The fan part 31 is arranged inside the outer shroud body 10 adjacent to the front end of the outer shroud body 10. The fan part 31 further includes a rotatable blade part 312 and a fan cover 311 arranged around the periphery of the blade part 312. Preferably, the fan cover 311 is close to the inner surface of the outer shroud body 10. The turbine part 32 of the fan turbine assembly 30 mainly includes a turbine box 321 and a multi-stage turbine 322 arranged in the turbine box 321, and the turbine box 321 is formed inside a high-pressure air cavity 325 and a low-pressure air cavity 326.

[0056] In particular, the intake and exhaust simulation device 1 according to the present invention includes a high-pressure intake port portion 51 and a low-pressure exhaust port portion 52, which are respectively connected to the interior of the turbine section 32. Specifically, the high-pressure intake port portion 51 is connected to the high-pressure air chamber 325 in the turbine box 321, and the low-pressure exhaust end portion 52 is connected to the low-pressure air chamber 326 in the turbine box 321. In the wind tunnel experiment, the high-pressure intake port portion 51 is operably connected to the high-pressure gas source, so that the high-pressure gas can pass into the interior of the turbine box 321 through the high-pressure intake port portion 51 and serve as a driving gas source for the turbine 322. At the same time, the low-pressure exhaust port portion 52 is operably connected to the low-pressure suction device, so that the interior of the turbine box 321 is connected to the low-pressure suction device, so that back pressure can be formed, so that the exhaust gas of the turbine section 32 is discharged through the low-pressure exhaust port 52.

[0057] Preferably, the pressure provided by the high-pressure air source and the back pressure generated by the low-pressure suction device are both adjustable, so that the pressure difference between the intake pressure and the back pressure of the high-pressure air source can achieve a larger adjustment range, thereby providing the driving air source provided to the turbine section 32 with a larger adjustable pressure range.

[0058] Particularly advantageously, the turbine case 321 is configured to be closed at the rear, so that the exhaust gas generated by the turbine is completely discharged through the low-pressure exhaust port 52, and is not discharged through the inner duct or the outer duct. Preferably, the high-pressure air source, the high-pressure air intake port 51, the interior of the turbine case 321, the low-pressure exhaust port 52 and the low-pressure suction device constitute a closed-loop reflux that provides the driving air source for the turbine.

[0059] In addition, if Figure 2As shown, the intake and exhaust simulation device 1 also includes a bracket 60 for installing the intake and exhaust simulation device 1 during the wind tunnel test. The bracket 60 is attached to the outer body 10, the inner body 20 and the fan turbine assembly 30 respectively. In this example, the high-pressure intake port portion 51 and the low-pressure exhaust port portion 52 include a high-pressure interface and a low-pressure interface located on the bracket 60 and a high-pressure through hole and a low-pressure through hole located on the turbine box 321. The high-pressure interface on the bracket 60 and the high-pressure through hole on the turbine box 321 are aligned and connected, and the low-pressure interface on the bracket 60 and the low-pressure through hole on the turbine box 321 are aligned and connected. In this way, the installer can operably connect the external high-pressure air source and the low-pressure suction device to the high-pressure interface and the low-pressure interface on the bracket 60, for example, through a pipeline, so as to achieve the connection of the turbine-driven airflow.

[0060] On the other hand, the intake and exhaust simulation device 1 according to the preferred embodiment of the present invention further comprises an adjustable tail cone assembly 40. The tail cone assembly 40 is fixedly mounted at the rear end of the turbine case 321 of the turbine section 32, such as Figure 2 As shown. The adjustable tail cone assembly 40 includes a tail cone body 42, at least a portion of which has a conical outer peripheral surface. At the same time, the adjustable tail cone assembly 40 also includes a tail cone adjustment device 41, which is configured to adjust the position of the tail cone body 42 relative to the inner body 20. The tail cone body is concentrically arranged in the inner body 20, so that with the adjustment of the tail cone adjustment device 41, the conical outer peripheral surface can be opposite to the inner peripheral surface of the inner body 20 at different positions, so that the size of the inner channel, especially the size at the inner channel nozzle, can be adjusted.

[0061] In a preferred embodiment, the coccyx adjustment device 41 includes a motor 412 and a telescopic screw 411. The motor 412 drives the telescopic screw 411 to rotate the screw 411, and the telescopic screw 411 is threadedly attached to the threaded hole inside the coccyx main body 42. As the motor 412 drives the telescopic screw 411 to rotate, the coccyx main body 42 can move linearly along the axial direction of the simulation device 1, thereby adjusting the relative position of the outer circumference of the cone and the inner circumference of the inner body 20.

[0062] In addition, if Figure 2 As shown, the inner flow measurement rake 21 is arranged between the tail cone body 42 and the inner body 20. Preferably, the inner flow measurement rake 21 is fixed to the inner circumference of the inner body 20 near the inner channel nozzle.

[0063] Figure 3 The function of the intake and exhaust simulation device 1 according to a preferred embodiment of the present invention is schematically shown.

[0064] Specifically, the turbine section of the intake and exhaust simulation device 1 is driven by the airflow entering from the high-pressure air source through the high-pressure intake port section 51. After the high-pressure airflow acts on the turbine, it leaves the turbine section through the low-pressure port section. At this time, all the gas provided by the high-pressure air source will leave through the low-pressure port section, and will not leave through the outer duct or the inner duct. As the turbine 322 rotates, the coaxially connected blade section 312 rotates together. The inlet flow at the blade section 312 enters from the front of the device 1. Part of this flow leaves from the outer duct, and the other part leaves from the inner duct. In other words, Figure 3 The fan inlet flow rate is equal to the sum of the external outlet flow rate and the internal outlet flow rate. The fan flow rate measurement rake 11 located downstream of the fan section 31 can measure the total flow rate of the airflow introduced by the blade section 312, while the internal flow rate will be measured by the internal flow rate measurement rake between the tail cone body section and the internal body 20.

[0065] The intake and exhaust simulation device 1 according to a preferred embodiment of the present invention can be installed through the following steps.

[0066] First, the blade part 312 and the turbine 322 are connected together through the rotating shaft 33, and then the fan cover 311 is installed outside the blade part 312 to form the fan part 31, and the turbine box 321 is installed outside the turbine 322 to form the turbine part 32. The front part of the turbine box 321 is pre-provided with a high-pressure interface / through hole, and the rear part is provided with a low-pressure interface / through hole. Subsequently, the adjustable tail cone assembly 40 can be fixed to the tail of the turbine box 321. Then, the bracket 60 is connected to the assembled fan turbine assembly 30 and the adjustable tail cone assembly 40, and the bracket 60 is installed to the test position. Then the outer body 10 is fixed to the front of the bracket 60, and the inner body 20 is fixed to the rear of the bracket 60. Finally, the high-pressure gas source connected to the external high-pressure gas source is connected to the high-pressure interface on the bracket 60 through a pipeline, and the low-pressure pipeline connected to the external low-pressure suction device is connected to the low-pressure interface on the bracket 60. The above installation process can easily complete the installation of the simulation device 1.

[0067] A low-pressure back-pressure generating mechanism is introduced into the turbine section 32 of the intake and exhaust simulation device 1 of the present invention, thereby realizing closed-loop operation of the turbine-driven airflow, so that the total intake and exhaust mass flow of the turbine section 32 in the simulation device 1 remains consistent. This can avoid lip shaping of the simulation device 1 and ensure that the lip pressure distribution under various engine operating conditions is similar.

[0068] Due to the addition of the low-pressure back-pressure mechanism, the pressure difference of the airflow provided to the turbine can be adjusted within a wider range, effectively increasing the rotation speed of the turbine and improving the boost ratio of the fan.

[0069] The intake and exhaust simulation device 1 of the present invention also has an adjustable tail cone assembly 40, which controls the external bypass flow rate by adjusting the internal bypass flow rate, thereby making it possible to simulate various actual bypass ratios of a real engine in real time.

[0070] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An intake and exhaust simulation device for a turbofan engine, comprising: connotation ontology; an inner body, the inner body being at least partially arranged within the outer body; a fan turbine assembly, the fan turbine assembly being arranged inside the outer casing body and comprising a fan portion and a turbine portion, the turbine portion comprising a turbine box and a turbine arranged in the turbine box; as well as A fan flow measurement rake, the fan flow measurement rake is arranged inside the outer culvert body to measure the flow inside the outer culvert body; An internal flow measurement rake, the internal flow measurement rake is arranged in the internal body to measure the flow in the internal body; The invention is characterized in that the intake and exhaust simulation device comprises a high-pressure intake port portion and a low-pressure exhaust port portion, the high-pressure intake port portion and the low-pressure exhaust port portion are respectively connected to the turbine portion, the high-pressure intake port portion is connected to a high-pressure air source, and the low-pressure exhaust port portion is connected to a low-pressure suction device, The high-pressure inlet port is used to pass high-pressure gas into the turbine part as a driving gas source, and the low-pressure exhaust port is arranged to allow the exhaust gas of the turbine part to pass out through the low-pressure exhaust device. The high-pressure intake port portion is disposed at least at a first position of the turbine case, and the low-pressure exhaust port portion is disposed at least at a second position of the turbine case, All the exhaust gas from the turbine unit is discharged through the low-pressure exhaust port. And the high-pressure air source, the high-pressure air intake port, the interior of the turbine box, the low-pressure exhaust port and the low-pressure suction device form a closed-loop reflux of the driving air source of the turbine.

2. The intake and exhaust simulation device according to claim 1, characterized in that: The intake and exhaust simulation device also includes a bracket, which is respectively attached to the outer body, the inner body and the fan turbine assembly.

3. The intake and exhaust simulation device according to claim 2, characterized in that: The high-pressure air inlet port portion and the low-pressure air exhaust port portion include a high-pressure interface and a low-pressure interface located on a bracket. The high-pressure interface and the low-pressure interface are configured to attach a high-pressure air source and a low-pressure suction device, respectively.

4. The intake and exhaust simulation device according to claim 1, characterized in that: The intake and exhaust simulation device further comprises an adjustable tail cone assembly, wherein the tail cone assembly is fixedly connected to the rear end of the turbine part. The adjustable coccyx assembly includes a coccyx body and a coccyx adjusting device, wherein the adjusting device is configured to adjust the position of the coccyx body relative to the inner body.

5. The intake and exhaust simulation device according to claim 4, characterized in that: The coccyx adjusting device comprises a motor and a telescopic screw, wherein the motor is connected to the telescopic screw for passing through the telescopic screw, and the telescopic screw is attached to the coccyx body so as to drive the coccyx body to move.

6. The intake and exhaust simulation device according to claim 4 or 5, characterized in that: The endogenous flow measurement rake is arranged between the coccygeal body portion and the endogenous body.

7. The intake and exhaust simulation device according to claim 1, characterized in that: The turbine box includes a high-pressure air chamber, a multi-stage turbine and a low-pressure air chamber. The high-pressure air intake port is connected to the high-pressure air chamber, and the low-pressure exhaust port is connected to the low-pressure air chamber.

8. The intake and exhaust simulation device according to claim 1, characterized in that: The fan flow measurement is located downstream of the fan section, The fan portion includes a blade portion and a fan cover surrounding the blade portion, and the fan portion is arranged inside the outer enclosure body adjacent to a front end of the outer enclosure body.

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