A steady dynamic adjustable pressure distortion generator and a test method thereof

Abstract

The application discloses a kind of stable dynamic adjustable pressure distortion generator and its test method, including first distortion section and second distortion section, adjusting module 1 and adjusting module 2, adjusting module 1 is a box with element, wherein D is distortion pipeline diameter, H is the height of distortion element, a and b are the horizontal distance and vertical distance of the center of adjacent two elements, box can be inserted into distortion section 1;Adjusting module 2 is the annular array of c*N distortion elements uniformly distributed in the second distortion section, wherein N is the number of dynamic measuring points, and c is a positive integer.The application is simple to operate, and has strong versatility.By changing the opening angle of array element and the distance of measurement section, the advantages of adjustable distortion strength of multi-hole hinge distortion generator are retained, a second distortion section is added, the adjustment range of dynamic pressure distortion index is increased, and the adjustable range of stable dynamic pressure distortion index is higher.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology, specifically relating to a dynamically adjustable pressure distortion generator and its testing method. Background Technology

[0002] With the continuous improvement of the maneuverability of modern aircraft, the problem of flow field distortion in engine air intake has become increasingly complex. Total pressure distortion is the most common type of air intake distortion, including steady-state total pressure distortion and dynamic total pressure distortion. Under different flight conditions, the proportions of steady-state pressure distortion index and dynamic pressure distortion index in the comprehensive distortion index are different.

[0003] Common pressure distortion simulation devices, such as distortion meshes, simulation boards, and insert boards, perform well in simulating steady-state pressure distortion, but they are still insufficient for dynamic pressure distortion and cannot simulate steady-state and dynamic distortions of different proportions. Currently used dynamic distortion simulation devices, such as jet simulation devices, also have significant shortcomings and are still under development.

[0004] A pressure distortion generator employing multiple hinged distortion elements can achieve adjustable distortion flow field. However, since dynamic distortion decays faster than steady-state distortion, if both the steady-state and dynamic distortion indices are generated by the same distortion generator, the dynamic distortion index may be relatively low. Furthermore, the numerous components in a multi-hole hinged distortion generator result in a large number of influencing parameters, making the design of a steady-state and dynamically adjustable distortion generator quite complex. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that dynamic distortion decays faster than steady-state distortion, and if both the steady-state and dynamic distortion indices are generated by the same distortion generator, the dynamic distortion index may be small. At the same time, it realizes the adjustable steady-state ratio and provides a pressure distortion generator with adjustable steady-state and dynamic distortion and its test method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a stable and dynamically adjustable pressure distortion generator, comprising: a first distortion section, a first adjustment module, a second adjustment module, and a second distortion section, wherein the first distortion section is connected to the second distortion section via a flange;

[0007] A first adjustment module is inserted into the middle of the first distortion segment to adjust the dynamic pressure distortion ratio. Several slots are evenly opened on the second distortion segment, and a second adjustment module is inserted into each of the slots to improve the dynamic pressure distortion ratio.

[0008] Furthermore, the first adjustment module includes a frame, a partition, and a first distortion element. The partition is disposed within the frame and connected to the inner wall of the frame. The first distortion element is disposed on the partition and is located within a first distortion segment.

[0009] Furthermore, the second adjustment module includes a transmission rod, a cover, a mounting platform, and a second distortion element. The cover, the mounting platform, and the second distortion element are sequentially arranged on the transmission rod. The inner wall of the groove is connected to the mounting platform. The transmission rod is slidably connected to the mounting platform. The cover is slidably connected to the mounting platform and is tightly attached to the surface of the second distortion section to cover the groove and prevent air leakage. The second distortion element is located inside the second distortion section.

[0010] Furthermore, both the first and second distortion elements are V-shaped elements, and holes are vertically opened on the surfaces of the two wings, with the total area of ​​the holes accounting for 20% of the total area of ​​the two wings.

[0011] Furthermore, both the first distortion element 8 and the second distortion element 12 have three angles: 0°, 60° and 120°.

[0012] Furthermore, the first distortion segment and the second distortion segment have the same diameter, and the middle part of the first distortion segment is square, which is used to insert the first adjustment module.

[0013] Furthermore, the first adjustment module is equipped with The first distortion element is provided, where [] represents rounding, D is the pipe diameter of the first distortion section, H is the height of the first distortion element, and a and b are the horizontal and vertical distances between the centers of two adjacent first distortion elements. The second adjustment module is provided with cN second distortion elements, where N is the number of dynamic measurement points and c is a positive integer.

[0014] This invention also provides a test method for a steady-state adjustable pressure distortion generator, comprising the following steps:

[0015] Step S1: Select the height of the first distortion element, the height of the second distortion element, and the size of the partition based on the pipe diameter of the first distortion section;

[0016] Step S2: Determine the opening and closing schemes of each first distortion element, each second distortion element, and the distance from the second distortion element in the second adjustment module to the measurement section based on the target pressure distortion spectrum.

[0017] Step S3: Record the current ambient temperature, humidity, and pressure information, and start the compressor;

[0018] Step S4: Adjust the Mach number of the flow field to the required range, generate a pressure spectrum, and calculate the steady-state pressure distortion index;

[0019] Step S5: Analyze the pressure spectrum and steady-state pressure distortion index, change the opening and closing scheme of the first distortion element and the second distortion element, adjust the distance between the second distortion element and the measurement section, regenerate the pressure spectrum and calculate the steady-state pressure distortion index.

[0020] Step S6: Repeat S5 until the target distortion map and the required steady-state pressure distortion index are formed.

[0021] Beneficial effects: This invention features a simple structure, convenient operation, and strong versatility. By changing the opening angle and distance of each element from the measurement section, it retains the advantage of the multi-hole hinge distortion generator in generating various distortion patterns, while also increasing the steady-state dynamic pressure distortion adjustment ratio. Furthermore, the addition of a second adjustment module to generate the dynamic distortion index further reduces the selection requirements for distortion elements, simplifies the design of the multi-hole hinge distortion generator elements, and avoids the situation where the steady-state dynamic distortion index is generated by the same distortion generator, resulting in a small dynamic distortion index. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the first adjustment module in this invention.

[0024] Figure 3 This is a schematic diagram of the three angles of the first and second distortion elements of the present invention.

[0025] Figure 4 This is a partial structural diagram of the second adjustment module of the present invention when it is far from the measuring section.

[0026] Figure 5 This is a partial structural diagram of the second adjustment module of the present invention when it is close to the measurement section.

[0027] In the figure: 1. First distortion segment, 2. First adjustment module, 3. Second adjustment module, 4. Second distortion segment, 5. Frame, 6. Vertical partition, 7. Horizontal partition, 8. First distortion element, 9. Transmission rod, 10. Cover, 11. Mounting platform, 12. Second distortion element. Detailed Implementation

[0028] The invention will now be further explained with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the present invention provides a stable and dynamically adjustable pressure distortion generator, characterized in that it includes: a first distortion section 1, a first adjustment module 2, a second adjustment module 3, and a second distortion section 4, wherein the first distortion section 1 is connected to the second distortion section 4 via a flange.

[0030] The first distortion section 1 has a first adjustment module 2 inserted in the middle, which is used to adjust the dynamic pressure distortion ratio. The second distortion section 4 has several slots evenly opened, and each of the slots has a second adjustment module 3 inserted in it, which is used to improve the dynamic pressure distortion ratio.

[0031] In this embodiment, the dynamically adjustable pressure distortion generator is placed on a test bench, which is also equipped with a fan. The front end of the first distortion section 1 and the rear end of the second distortion section 4 are both provided with flanges that mate with the fan's duct. The flanges have a plurality of bolt holes evenly distributed around their circumference for connection. Through bolt connection, the first distortion section 1 and the second distortion section 4 are connected to the duct. The rear end of the first distortion section 1 and the front end of the second distortion section 4 are both provided with flanges that mate with each other. The flanges have a plurality of bolt holes evenly distributed around their circumference for connection. Through bolt connection, the first distortion section 1 and the second distortion section 4 are connected. The first distortion section 1, the second distortion section 4, and the duct have the same diameter. The first distortion section 1 and the second distortion section 4 are tubular. The middle of the first distortion section 1 is thickened into a square shape for inserting the first adjustment module 2. The second distortion section 4 has a slot, oriented along the flow field direction, for inserting the second adjustment module 3.

[0032] like Figure 2 As shown, the first adjustment module 2 includes a frame 5, a partition, and a first distortion element 8. The partition is disposed inside the frame 5 and connected to the inner wall of the frame 5. The first distortion element 8 is disposed on the partition and located within the first distortion segment 1. The partition includes vertical partitions 6 and horizontal partitions 7, which are arranged in a staggered mesh pattern inside the housing 5 and connected to the inner wall of the housing 5.

[0033] In this embodiment, the first adjustment module 2 is provided with There are three first distortion elements 8, where [] represents rounding, D is the pipe diameter of the first distortion section, H is the height of the first distortion element, and a and b are the horizontal and vertical distances between the centers of two adjacent first distortion elements. In use, the angle of the first distortion element 8 can be adjusted by replacing the baffle with first distortion elements 8 with different angles, thereby facilitating the adjustment of the steady-state pressure distortion ratio.

[0034] like Figure 3 As shown, both the first distortion element 8 and the second distortion element 12 have three opening angles: 0°, 60°, and 120°. Furthermore, both the first distortion element 8 and the second distortion element 12 are V-shaped elements, and holes are vertically opened on the surfaces of both wings. The total area of ​​the holes accounts for 20% of the total area of ​​the two wings, which increases the dynamic pressure distortion ratio and optimizes the effect of adjusting the dynamic pressure distortion ratio.

[0035] like Figure 4-5 As shown, the second adjustment module 3 includes a transmission rod 9, a cover 10, a mounting platform 11, and a second distortion element 12. The cover 10, the mounting platform 11, and the second distortion element 12 are sequentially arranged on the transmission rod 9. The inner wall of the groove is connected to the mounting platform 11. The transmission rod 9 is slidably connected to the mounting platform 11. The cover 10 is slidably connected to the second distortion section 4 and is tightly attached to the surface of the mounting platform 11 to cover the groove and prevent air leakage. The second distortion element 12 is located inside the second distortion element 12.

[0036] In this embodiment, the second adjustment module 3 is equipped with cN second distortion elements 12, where N is the number of dynamic measuring points and c is a positive integer. The second distortion elements 12 are clamped onto the transmission rod 9. During adjustment, a one-dimensional displacement device controls the transmission rod 9 to move the second distortion elements 12 along the incoming flow direction and radially. At the end of the adjustment, the second distortion elements 12 stop moving and are fixed in their respective positions. The distance from the second distortion element to the measuring section is used to adjust the dynamic pressure distortion adjustment ratio. The one-dimensional displacement device can be a drive device such as a motor, cylinder, or electric telescopic rod.

[0037] Furthermore, in this embodiment, a is set to 1.2, b to 2, N to 8, and c to 3, thereby making the dynamic pressure distortion ratio of the first adjustment module 2 more accurate and enabling the second adjustment module 3 to achieve a better dynamic pressure distortion ratio.

[0038] In summary, by changing the angle of the array elements and the distance of the measured cross section, the present invention retains the advantage of adjustable distortion intensity of the multi-hole hinge distortion generator, adds a second distortion generation section, increases the adjustment range of the dynamic pressure distortion index, and makes the adjustable range of the stable dynamic pressure distortion index even higher.

[0039] This invention also provides a test method for a steady-state adjustable pressure distortion generator, comprising the following steps:

[0040] Step S1: Select the height of the first distortion element, the height of the second distortion element, and the size of the partition based on the pipe diameter of the first distortion section.

[0041] Step S2: Determine the opening and closing schemes of each first distortion element, each second distortion element, and the distance from the second distortion element in the second adjustment module to the measurement section based on the target pressure distortion spectrum.

[0042] Step S3: Record the current ambient temperature, humidity and pressure information, and start the compressor.

[0043] Step S4: Adjust the Mach number of the flow field to the required range, generate a pressure spectrum, and calculate the steady-state pressure distortion index;

[0044] Step S5: Analyze the pressure spectrum and steady-state pressure distortion index, change the opening and closing scheme of the first and second distortion elements, adjust the distance between the second distortion element and the measurement section, regenerate the pressure spectrum and calculate the steady-state pressure distortion index.

[0045] Step S6: Repeat S5 until the target distortion map and the required steady-state pressure distortion index are formed.

[0046] This invention achieves adjustable steady-state distortion index by adding a distortion generation section, further reducing the requirements for components. Simultaneously, this invention can simulate steady-state pressure distortion of different structures, directions, and intensities at the engine inlet, demonstrating excellent engineering applicability and versatility, and can be used for compressor stability testing.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dynamically adjustable pressure distortion generator, characterized in that, include: The system comprises a first distortion segment (1), a first adjustment module (2), a second adjustment module (3), and a second distortion segment (4), wherein the first distortion segment (1) is connected to the second distortion segment (4) via a flange; The first distortion segment (1) is connected to the middle of a first adjustment module (2) for adjusting the dynamic pressure distortion ratio. The second distortion segment (4) is provided with several slots evenly distributed, and a second adjustment module (3) is connected to each of the slots for improving the dynamic pressure distortion ratio. The first adjustment module (2) includes a frame (5), a partition and a first distortion element (8). The partition is disposed inside the frame (5) and connected to the inner wall of the frame (5). The first distortion element (8) is disposed on the partition and is located in the first distortion segment (1). The second adjustment module (3) includes a transmission rod (9), a cover (10), a mounting platform (11), and a second distortion element (12). The cover (10), the mounting platform (11), and the second distortion element (12) are sequentially arranged on the transmission rod (9). The inner wall of the groove is connected to the mounting platform (11). The transmission rod (9) is slidably connected to the mounting platform (11). The cover (10) is slidably connected to the mounting platform (11) and closely attached to the surface of the second distortion section (4) to cover the groove and prevent air leakage. The second distortion element (12) is located inside the second distortion section (4).

2. The dynamically adjustable pressure distortion generator according to claim 1, characterized in that, The first distortion element (8) and the second distortion element (12) are both V-shaped elements, and holes are vertically opened on the surfaces of the two wings. The total area of ​​the holes accounts for 20% of the total area of ​​the two wings.

3. The dynamically adjustable pressure distortion generator according to claim 2, characterized in that, The first distortion element (8) and the second distortion element (12) each have three angles, namely 0°, 60° and 120°.

4. The dynamically adjustable pressure distortion generator according to claim 1, characterized in that, The first distortion segment (1) and the second distortion segment (4) have the same diameter, and the middle part of the first distortion segment (1) is square, which is used to insert the first adjustment module (2).

5. The dynamically adjustable pressure distortion generator according to claim 1, characterized in that, The first adjustment module (2) is provided with A first distortion element (8), where [] represents rounding, D is the pipe diameter of the first distortion section, a and b are the horizontal and vertical distances between the centers of two adjacent first distortion elements, and the second adjustment module (3) is provided with cN second distortion elements (12), where N is the number of dynamic measurement points and c is a positive integer.

6. A test method for a dynamically adjustable pressure distortion generator, used in any one of claims 1-5, characterized in that, Includes the following steps: Step S1: Select the height of the first distortion element, the height of the second distortion element, and the size of the partition based on the pipe diameter of the first distortion section; Step S2: Determine the opening and closing schemes of each first distortion element, each second distortion element, and the distance from the second distortion element in the second adjustment module to the measurement section based on the target pressure distortion spectrum. Step S3: Record the current ambient temperature, humidity, and pressure information, and start the compressor; Step S4: Adjust the Mach number of the flow field to the required range, generate a pressure spectrum, and calculate the steady-state pressure distortion index; Step S5: Analyze the pressure spectrum and steady-state pressure distortion index, change the opening and closing scheme of the first distortion element and the second distortion element, adjust the distance between the second distortion element and the measurement section, regenerate the pressure spectrum and calculate the steady-state pressure distortion index. Step S6: Repeat S5 until the target distortion map and the required steady-state pressure distortion index are formed.

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