A multi-valve group continuously variable Mach number control device and control method

Abstract

A multi-valve group continuously variable Mach number control device and control method belongs to the technical field of multi-valve group device flow field control. To solve the problem of multi-valve group synchronous control under continuously variable Mach number conditions, the present invention establishes a corresponding relationship between the profile of a flexible-wall nozzle and a target Mach number through simulation calculation and profile calibration to select the Mach number; determines whether to use a low-pressure air source or a medium-pressure air source for air supply, and determines the target value of the exhaust pressure, low-pressure intake pressure, or medium-pressure intake pressure corresponding to the selected Mach number according to the test purpose; and synchronously controls the corresponding nozzle profile, stable section total pressure, test section static pressure, low-pressure intake pressure, and exhaust pressure according to each selected Mach number discrete point of the flexible-wall nozzle profile, or synchronously controls the corresponding nozzle profile, stable section total pressure, test section static pressure, medium-pressure intake pressure, and exhaust pressure, thereby constructing a parameter correspondence table for each variable in the continuously variable Mach number process for real-time control.

Description

Technical Field

[0001] The present invention belongs to the technical field of flow field control of a multi-valve group device, and in particular relates to a multi-valve group continuously variable Mach number control device and a control method. Background Art

[0002] The multi-valve group continuously variable Mach number device is a device used in aerodynamic research, providing strong support and guarantee for the development of aviation and aerospace. The multi-valve group continuously variable Mach number device uses a compressor group as a continuous driving air source, adjusting the intake valve group and the exhaust valve group to achieve the target total pressure and target exhaust pressure before and after the test section, while ensuring that the nozzle profile is at the target Mach number. The regulating valve group is controlled in real time to maintain the Mach number of the flow channel at the target Mach number. Because the target Mach number in the flow channel is a continuously changing state, it is necessary to ensure that the Mach number accurately reaches the target value while continuously coordinating and synchronizing a series of regulating devices such as the intake pressure, exhaust pressure, total pressure, and nozzle. This places high demands on the control process and control accuracy of the entire system. For these reasons, a multi-valve group continuously variable Mach number device and method that can achieve precise and synchronous control is urgently needed to meet the relevant testing requirements of continuously variable Mach number. Summary of the Invention

[0003] The problem to be solved by the present invention is the target quantity precision control and multi-valve group synchronous control problem under the condition of continuously variable Mach number, and a multi-valve group continuously variable Mach number control device and control method are proposed.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A multi-valve group continuously variable Mach number control device comprises a low-pressure air source, the low-pressure air source is connected to a low-pressure air intake stop valve, the low-pressure air intake stop valve is connected to a low-pressure air discharge main regulating valve, a low-pressure air discharge auxiliary regulating valve and a low-pressure stop valve, the low-pressure air discharge main regulating valve and the low-pressure air discharge auxiliary regulating valve are connected to an air discharge tower, a medium-pressure air source is connected to a medium-pressure air intake stop valve, the medium-pressure air intake stop valve is connected to a medium-pressure air discharge main regulating valve, a medium-pressure air discharge auxiliary regulating valve and a medium-pressure stop valve, the medium-pressure air discharge main regulating valve and the medium-pressure air discharge auxiliary regulating valve are connected to an air discharge tower, the air discharge stop valve is connected to the air discharge tower, and a stop valve on the air intake side of the main line is connected. Connected to the low-pressure stop valve, medium-pressure stop valve, bleed stop valve, main regulating valve of the main line and auxiliary regulating valve of the main line, the main regulating valve of the main line and the auxiliary regulating valve of the main line are connected to the stable section, the stable section, the flexible-wall nozzle, the test section, and the main line exhaust-side stop valve are connected in sequence, the main line exhaust-side stop valve is connected to the main exhaust regulating valve, the auxiliary exhaust regulating valve, the air supply regulating valve, and the exhaust stop valve, the exhaust stop valve is connected to the exhaust tower, the air supply regulating valve, the air supply stop valve, and the air supply tower are connected in sequence, the main exhaust regulating valve and the auxiliary exhaust regulating valve are connected to the exhaust stop valve, and the exhaust stop valve is connected to the exhaust device;

[0006] A low-pressure pressure sensor is installed on the pipeline between the low-pressure air intake stop valve and the low-pressure stop valve, a medium-pressure pressure sensor is installed on the pipeline between the medium-pressure air intake stop valve and the medium-pressure stop valve, a stable section total pressure sensor is installed in the stable section, a test section static pressure sensor is installed in the test section, and an exhaust pressure sensor is installed on the connecting pipeline between the main line exhaust side stop valve and the exhaust main regulating valve, exhaust auxiliary regulating valve, air supply regulating valve, and exhaust stop valve; the central controller controls and adjusts all valves based on the pressure data collected by the low-pressure pressure sensor, medium-pressure pressure sensor, stable section total pressure sensor, test section static pressure sensor, and exhaust pressure sensor.

[0007] Furthermore, the flexible wall nozzle is designed to be symmetrical in the upper and lower directions. The upper flexible wall group and the lower flexible wall group are respectively installed on the upper wall and the lower wall of the nozzle. The upper flexible wall group and the lower flexible wall group each include several equidistantly arranged action units and flexible wall panels. Each action unit is composed of a motor, a reducer and an elevator. The elevator end of each action unit is connected to the flexible wall panel, and the nozzle controller is connected to each action unit through the EtherCAT real-time bus.

[0008] Furthermore, during one profile movement, the nozzle controller controls all the action units of the upper flexible wall group and the lower flexible wall group to move synchronously, thereby moving the flexible wall panel from profile A to profile B.

[0009] Furthermore, the design flow of the low-pressure air release auxiliary regulating valve is set to 1 / 4 of the design flow of the low-pressure air release main regulating valve, the design flow of the medium-pressure air release auxiliary regulating valve is set to 1 / 4 of the design flow of the medium-pressure air release main regulating valve, the design flow of the main line auxiliary regulating valve is set to 1 / 4 of the design flow of the main line main regulating valve, and the design flow of the exhaust auxiliary regulating valve is set to 1 / 4 of the design flow of the exhaust main regulating valve.

[0010] A control method for a multi-valve group continuously variable Mach number control device is implemented based on the multi-valve group continuously variable Mach number control device, comprising the following steps:

[0011] S1. Through simulation calculations and profile calibration, establish the correspondence between the flexible-wall nozzle profile and the target Mach number and select the Mach number;

[0012] S2. Based on the Mach number selected in step S1, determine the corresponding target values ​​for the total pressure in the stable section and the static pressure in the test section. Determine whether to use a low-pressure or medium-pressure air source for air supply. Based on the test objectives, determine the target values ​​for the extraction pressure, low-pressure intake pressure, or medium-pressure intake pressure corresponding to the selected Mach number.

[0013] S3. For each selected Mach number discrete point, the corresponding nozzle profile, stable section total pressure, test section static pressure, low-pressure intake pressure, and exhaust pressure are synchronously controlled. Alternatively, the nozzle profile, stable section total pressure, test section static pressure, intermediate-pressure intake pressure, and exhaust pressure are synchronously controlled. When the Mach number intervals between discrete points do not meet the requirements, linear interpolation is performed between the points to construct a parameter table for each variable in the continuously variable Mach number process. This allows for real-time control of a multi-valve group continuously variable Mach number control device.

[0014] Furthermore, the calculation formula for determining the corresponding target value of the total pressure of the stable section and the target value of the static pressure of the test section in step S2 is:

[0015] ;

[0016] in, is the Mach number, is the total pressure in the stable section, is the static pressure of the test section.

[0017] Step S3 uses an incremental PI closed-loop control method to synchronously control the target pressure of the low-pressure air release auxiliary regulating valve, the low-pressure air release main regulating valve, the medium-pressure air release auxiliary regulating valve, the medium-pressure air release main regulating valve, the main line auxiliary regulating valve, the main line main regulating valve, the air extraction auxiliary regulating valve, and the air extraction main regulating valve.

[0018] Furthermore, the specific implementation method of step S3 includes the following steps:

[0019] S3.1. Close the low-pressure air intake stop valve, medium-pressure air intake stop valve, low-pressure air discharge main regulating valve, low-pressure air discharge auxiliary regulating valve, medium-pressure air discharge main regulating valve, medium-pressure air discharge auxiliary regulating valve, low-pressure stop valve, medium-pressure stop valve, main line air intake stop valve, main line main regulating valve, main line auxiliary regulating valve, main line exhaust stop valve, exhaust main regulating valve, exhaust auxiliary regulating valve, exhaust stop valve, air supply regulating valve, air supply stop valve, and exhaust stop valve. Open the air discharge stop valve. Maintain the nozzle profile at the initial profile. ;

[0020] S3.2 based on step S2 to determine the use of low-pressure gas source or medium-pressure gas source gas supply, low-pressure target pressure adjustment control or medium-pressure target pressure adjustment control;

[0021] The low pressure target pressure adjustment and control method is to open the low pressure intake stop valve, and after the low pressure sensor reading remains stable, open the low pressure exhaust main regulating valve for closed loop control, and Initial target value of low pressure sensor When the relationship (1) is satisfied, the valve position of the low-pressure bleed main regulating valve is kept unchanged, and the low-pressure bleed auxiliary regulating valve is started for closed-loop control. The expression is:

[0022] (1)

[0023] in, is the error band of low pressure inlet pressure;

[0024] The medium pressure target pressure is regulated and controlled by opening the medium pressure intake stop valve, and after the medium pressure sensor reading remains stable, opening the medium pressure exhaust main regulating valve for closed-loop control, and Initial target value of medium pressure sensor When the relationship (2) is satisfied, the valve position of the medium-pressure bleed main regulating valve is kept unchanged, and the medium-pressure bleed auxiliary regulating valve is started for closed-loop control. The expression is:

[0025] (2)

[0026] in, is the error band of the medium pressure inlet pressure;

[0027] S3.3. Based on the low-pressure target pressure regulation control or medium-pressure target pressure regulation control in step S3.2, open the low-pressure stop valve or medium-pressure stop valve, close the bleed stop valve, open the main line inlet side stop valve, open the main line main regulating valve to perform closed-loop control, and read the total pressure sensor in real time during the stable period. and the initial target value of the total pressure sensor in the stable section When the relationship (3) is satisfied, the valve position of the main regulating valve of the main line is kept unchanged, and the auxiliary regulating valve of the main line is started to perform closed-loop control. The expression is:

[0028] (3)

[0029] in, is the error band of the total pressure in the stabilizing section;

[0030] S3.4. Open the air extraction stop valve and the air supply stop valve. If the air extraction pressure sensor reads Initial target value of the exhaust pressure sensor If the relationship (4) is satisfied, the main regulating valve of the exhaust is opened for closed-loop control, and the real-time reading of the exhaust pressure sensor is Initial target value of the exhaust pressure sensor When the relationship (5) is satisfied, the valve position of the main exhaust control valve is kept unchanged, and the auxiliary exhaust control valve is started for closed-loop control. When the relationship (6) is satisfied, the valve positions of the main exhaust control valve and the auxiliary exhaust control valve are kept unchanged, and the air supply control valve is started for closed-loop control. The expression is:

[0031] (4)

[0032] (5)

[0033] (6)

[0034] in, is the error band of the pumping pressure;

[0035] After step S3.1 to step S3.4, the test section has formed the initial Mach number ;

[0036] S3.5. The central controller shall synchronously control the nozzle profile, main line main regulating valve, low-pressure bleed main regulating valve, exhaust main regulating valve or air supply regulating valve so that the nozzle profile, stable section total pressure, low-pressure bleed pressure, and exhaust pressure reach the same level. Target value corresponding to the step 、 、 、 , at this time the Mach number is formed , repeat step S3.5 until all Mach number sequences are completed, where Mach number The nozzle profile below, Mach number The total pressure of the stable section under Mach number The low pressure sensor target value under Mach number The target value of the exhaust pressure sensor under

[0037] Beneficial effects of the present invention:

[0038] The multi-valve group continuously variable Mach number control device described in the present invention can effectively coordinate a complex system of multiple valves and multiple components to achieve a continuous, reliable, and high-precision change state of the controlled Mach number in the flow channel of the device. The present invention can meet the overall system's requirements in many aspects such as real-time performance, stability, reliability, and convenience and operability of the control process, and has good application prospects in continuously variable Mach number control. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a structural schematic diagram of a multi-valve group continuously variable Mach number control device according to the present invention, in which: 1- low-pressure air source, 2- medium-pressure air source, 3- venting tower, 4- low-pressure air intake stop valve, 5- medium-pressure air intake stop valve, 6- low-pressure air discharge main regulating valve, 7- low-pressure air discharge auxiliary regulating valve, 8- medium-pressure air discharge main regulating valve, 9- medium-pressure air discharge auxiliary regulating valve, 10- low-pressure stop valve, 11- medium-pressure stop valve, 12- air discharge stop valve, 13- main line air intake side stop valve, 14- main line main regulating valve, 15- main line auxiliary regulating valve , 16-stable section, 17-flexible wall nozzle, 18-test section, 19-main line exhaust side stop valve, 20-exhaust main regulating valve, 21-exhaust auxiliary regulating valve, 22-exhaust stop valve, 23-air supply regulating valve, 24-air supply stop valve, 25-exhaust stop valve, 26-exhaust tower, 27-air supply tower, 28-exhaust device, 29-low pressure sensor, 30-medium pressure sensor, 31-stable section total pressure sensor, 32 test section static pressure sensor, 33-exhaust pressure sensor, 34-central controller;

[0040] Figure 2 101 - upper flexible wall assembly, 102 - lower flexible wall assembly, 103 - upper nozzle wall, 104 - lower nozzle wall, 105 - actuating unit, 106 - motor, 107 - reducer, 108 - elevator, 109 - flexible wall plate, 110 - nozzle controller.

[0041] Figure 3 This is the control principle diagram of the present invention;

[0042] Figure 4 This is a flow chart of a control method for a multi-valve group continuously variable Mach number control device according to the present invention. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the specific embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the specific embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in various different configurations, and the present invention can also have other embodiments.

[0044] Therefore, the following detailed description of the specific embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected specific embodiments of the present invention. All other specific embodiments obtained by those skilled in the art based on the specific embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] In order to further understand the content, features and effects of the present invention, the following specific embodiments are given as examples, and the attached Figure 1 -Attached Figure 4 The detailed instructions are as follows:

[0046] Example 1:

[0047] A multi-valve group continuously variable Mach number control device comprises a low-pressure gas source 1, wherein the low-pressure gas source 1 is connected to a low-pressure air intake stop valve 4, the low-pressure air intake stop valve 4 is connected to a low-pressure air discharge main regulating valve 6, a low-pressure air discharge auxiliary regulating valve 7 and a low-pressure stop valve 10, the low-pressure air discharge main regulating valve 6 and the low-pressure air discharge auxiliary regulating valve 7 are connected to an air discharge tower 3, a medium-pressure gas source 2 is connected to a medium-pressure air intake stop valve 5, the medium-pressure air intake stop valve 5 is connected to a medium-pressure air discharge main regulating valve 8, a medium-pressure air discharge auxiliary regulating valve 9 and a medium-pressure stop valve 11, the medium-pressure air discharge main regulating valve 8 and the medium-pressure air discharge auxiliary regulating valve 9 are connected to the air discharge tower 3, the air discharge stop valve 12 is connected to the air discharge tower 3, the main line air intake side stop valve 13 is connected to the low-pressure stop valve 10, the medium-pressure stop valve 11. The venting stop valve 12, the main regulating valve 14 of the main line, and the auxiliary regulating valve 15 of the main line are connected. The main regulating valve 14 and the auxiliary regulating valve 15 of the main line are connected to the stabilizing section 16. The stabilizing section 16, the flexible-wall nozzle 17, the test section 18, and the main line air extraction side stop valve 19 are connected in sequence. The main line air extraction side stop valve 19 is connected to the main air extraction regulating valve 20, the auxiliary air extraction regulating valve 21, the air supply regulating valve 23, and the exhaust stop valve 25. The exhaust stop valve 25 is connected to the exhaust tower 26. The air supply regulating valve 23, the air supply stop valve 24, and the air supply tower 27 are connected in sequence. The main air extraction regulating valve 20 and the auxiliary air extraction regulating valve 21 are connected to the air extraction stop valve 22. The air extraction stop valve 22 is connected to the air extraction device 28.

[0048] A low-pressure pressure sensor 29 is installed on the pipeline between the low-pressure air intake stop valve 4 and the low-pressure stop valve 10, a medium-pressure pressure sensor 30 is installed on the pipeline between the medium-pressure air intake stop valve 5 and the medium-pressure stop valve 11, a stable section total pressure sensor 31 is installed in the stable section 16, a test section static pressure sensor 32 is installed in the test section 18, and an exhaust pressure sensor 33 is installed on the connecting pipeline between the main line exhaust side stop valve 19 and the exhaust main regulating valve 20, the exhaust auxiliary regulating valve 21, the air supply regulating valve 23, and the exhaust stop valve 25; the central controller 34 controls and adjusts all valves based on the pressure data collected by the low-pressure pressure sensor 29, the medium-pressure pressure sensor 30, the stable section total pressure sensor 31, the test section static pressure sensor 32, and the exhaust pressure sensor 33.

[0049] Furthermore, the flexible wall nozzle 17 is designed to be symmetrical in the upper and lower directions. The upper flexible wall group 101 and the lower flexible wall group 102 are respectively installed on the upper wall 103 and the lower wall 104 of the nozzle. The upper flexible wall group 101 and the lower flexible wall group 102 each include a plurality of equally spaced action units 105 and a flexible wall plate 109. Each action unit 105 is composed of a motor 106, a reducer 107 and an elevator 108. The end of the elevator 108 of each action unit 105 is connected to the flexible wall plate 109. The nozzle controller 110 is connected to each action unit 105 via an EtherCAT real-time bus.

[0050] Furthermore, during one profile movement, the nozzle controller 110 controls all the motion units 105 of the upper flexible wall group 101 and the lower flexible wall group 102 to move synchronously, thereby moving the flexible wall plate 109 from profile A to profile B.

[0051] Furthermore, the design flow of the low-pressure air release auxiliary regulating valve 7 is set to 1 / 4 of the design flow of the low-pressure air release main regulating valve 6, the design flow of the medium-pressure air release auxiliary regulating valve 9 is set to 1 / 4 of the design flow of the medium-pressure air release main regulating valve 8, the design flow of the main line auxiliary regulating valve 15 is set to 1 / 4 of the design flow of the main line main regulating valve 14, and the design flow of the exhaust auxiliary regulating valve 21 is set to 1 / 4 of the design flow of the exhaust main regulating valve 20.

[0052] Example 2:

[0053] A control method for a multi-valve group continuously variable Mach number control device is implemented based on the multi-valve group continuously variable Mach number control device described in Example 1, comprising the following steps:

[0054] S1. Through simulation calculation and profile calibration, establish the corresponding relationship between the profile of the flexible-wall nozzle 17 and the target Mach number and select the Mach number;

[0055] S2. Based on the Mach number selected in step S1, determine the corresponding target values ​​for the total pressure in the stable section and the static pressure in the test section. Determine whether to use low-pressure air source 1 or medium-pressure air source 2 for air supply. Based on the test objectives, determine the target values ​​for the extraction pressure, low-pressure intake pressure, or medium-pressure intake pressure corresponding to the selected Mach number.

[0056] Furthermore, the calculation formula for determining the corresponding target value of the total pressure of the stable section and the target value of the static pressure of the test section in step S2 is:

[0057] ;

[0058] in, is the Mach number, is the total pressure in the stable section, is the static pressure of the test section;

[0059] S3. The flexible-wall nozzle 17 profile is controlled synchronously, according to each selected Mach number discrete point, along with the corresponding nozzle profile, stable section total pressure, test section static pressure, low-pressure intake pressure, and exhaust pressure. Alternatively, the nozzle profile, stable section total pressure, test section static pressure, intermediate-pressure intake pressure, and exhaust pressure are controlled synchronously. When the Mach number intervals between discrete Mach number points do not meet the requirements, linear interpolation is performed between the points to construct a parameter correspondence table for each variable in the continuously variable Mach number process, thereby providing real-time control of a multi-valve group continuously variable Mach number control device.

[0060] Furthermore, step S3 uses an incremental PI closed-loop control method to synchronously control the target pressure of the low-pressure air release auxiliary regulating valve 7, the low-pressure air release main regulating valve 6, the medium-pressure air release auxiliary regulating valve 9, the medium-pressure air release main regulating valve 8, the main line auxiliary regulating valve 15, the main line main regulating valve 14, the air extraction auxiliary regulating valve 21, and the air extraction main regulating valve 20.

[0061] Taking the use of low-pressure gas source 1 and various main regulating valves as an example, the calculation method is as follows:

[0062] ;

[0063] in, 、 、 are the valve position control increments of the low-pressure venting main regulating valve 6, the main line main regulating valve 14, and the exhaust main regulating valve 20 at time k, 、 、 They are the proportional control coefficients of the low-pressure venting main regulating valve 6, the main line main regulating valve 14, and the exhaust main regulating valve 20, respectively. 、 、 are the integral control coefficients of the low-pressure venting main regulating valve 6, the main line main regulating valve 14, and the exhaust main regulating valve 20, respectively. and The real-time readings of the low pressure sensor 29 at time k and time k-1 are respectively and target value The deviation of and The real-time readings of the total pressure sensor 31 in the stable section at time k and time k-1 are respectively and target value The deviation value of and The real-time readings of the exhaust pressure sensor 33 at time k and time k-1 are respectively and target value Deviation value of

[0064] Furthermore, the specific implementation method of step S3 includes the following steps:

[0065] S3.1. Close the low-pressure air intake stop valve 4, the medium-pressure air intake stop valve 5, the low-pressure air discharge main regulating valve 6, the low-pressure air discharge auxiliary regulating valve 7, the medium-pressure air discharge main regulating valve 8, the medium-pressure air discharge auxiliary regulating valve 9, the low-pressure stop valve 10, the medium-pressure stop valve 11, the main line air intake stop valve 13, the main line main regulating valve 14, the main line auxiliary regulating valve 15, the main line air extraction stop valve 19, the main extraction regulating valve 20, the auxiliary extraction regulating valve 21, the extraction stop valve 22, the air supply regulating valve 23, the air supply stop valve 24, and the exhaust stop valve 25. Open the air discharge stop valve 12. Maintain the nozzle profile at the initial profile. ;

[0066] S3.2 based on step S2 to determine the use of low-pressure gas source 1 or medium-pressure gas source 2 gas supply, low-pressure target pressure adjustment control or medium-pressure target pressure adjustment control;

[0067] The low pressure target pressure adjustment and control method is to open the low pressure intake stop valve 4, and after the low pressure pressure sensor 29 reading remains stable, open the low pressure exhaust main regulating valve 6 for closed loop control, and the low pressure pressure sensor 29 real-time reading is Initial target value of low pressure sensor 29 When the relationship (1) is satisfied, the valve position of the low-pressure bleed main regulating valve 6 is kept unchanged, and the low-pressure bleed auxiliary regulating valve 7 is started to perform closed-loop control. The expression is:

[0068] (1)

[0069] in, is the error band of low pressure inlet pressure;

[0070] The medium pressure target pressure is regulated and controlled by opening the medium pressure intake stop valve 5, and after the medium pressure sensor 30 reading remains stable, opening the medium pressure exhaust main regulating valve 8 for closed loop control, and Initial target value of medium pressure sensor 30 When the relationship (2) is satisfied, the valve position of the medium-pressure air release main regulating valve 8 is kept unchanged, and the medium-pressure air release auxiliary regulating valve 9 is started to perform closed-loop control. The expression is:

[0071] (2)

[0072] in, is the error band of the medium pressure inlet pressure;

[0073] S3.3. Based on the low-pressure target pressure regulation control or medium-pressure target pressure regulation control in step S3.2, open low-pressure shutoff valve 10 or medium-pressure shutoff valve 11, close bleed shutoff valve 12, open main line inlet side shutoff valve 13, open main line main regulating valve 14 to perform closed-loop control, and read the total pressure sensor 31 in real time during the stable period. and the initial target value of the total pressure sensor 31 in the stable section When the relationship (3) is satisfied, the valve position of the main regulating valve 14 of the main line is kept unchanged, and the auxiliary regulating valve 15 of the main line is started to perform closed-loop control. The expression is:

[0074] (3)

[0075] in, is the error band of the total pressure in the stabilizing section;

[0076] S3.4. Open the air extraction stop valve 22 and the air supply stop valve 24. If the air extraction pressure sensor 33 reads The initial target value of the exhaust pressure sensor 33 If the relationship (4) is satisfied, the main regulating valve 20 for exhaust is opened for closed-loop control, and the exhaust pressure sensor 33 reads the real-time reading. The initial target value of the exhaust pressure sensor 33 When the relationship (5) is satisfied, the valve position of the main exhaust control valve 20 is kept unchanged, and the auxiliary exhaust control valve 21 is started for closed-loop control. When the relationship (6) is satisfied, the valve positions of the main exhaust control valve 20 and the auxiliary exhaust control valve 21 are kept unchanged, and the air supply control valve 23 is started for closed-loop control. The expression is:

[0077] (4)

[0078] (5)

[0079] (6)

[0080] in, is the error band of the pumping pressure;

[0081] After step S3.1 to step S3.4, the test section has formed the initial Mach number ;

[0082] S3.5. The central controller 34 synchronously controls the nozzle profile, main line main regulating valve 14, low-pressure bleed main regulating valve 6, exhaust main regulating valve 20 or air supply regulating valve 23, so that the nozzle profile, stable section total pressure, low-pressure bleed pressure, and exhaust pressure simultaneously reach Target value corresponding to the step 、 、 、 , at this time the Mach number is formed , repeat step S3.5 until all Mach number sequences are completed, where Mach number The nozzle profile below, Mach number The total pressure of the stable section under Mach number The low pressure sensor target value under Mach number The target value of the exhaust pressure sensor under

[0083] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0084] Although the present application has been described above with reference to specific embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A multi-valve group continuously variable Mach number control device, characterized in that: The invention comprises a low-pressure gas source (1), wherein the low-pressure gas source (1) is connected to a low-pressure air intake stop valve (4), the low-pressure air intake stop valve (4) is connected to a low-pressure air discharge main regulating valve (6), a low-pressure air discharge auxiliary regulating valve (7) and a low-pressure stop valve (10), the low-pressure air discharge main regulating valve (6) and the low-pressure air discharge auxiliary regulating valve (7) are connected to an air discharge tower (3), a medium-pressure gas source (2) is connected to a medium-pressure air intake stop valve (5), the medium-pressure air intake stop valve (5) is connected to a medium-pressure air discharge main regulating valve (8), a medium-pressure air discharge auxiliary regulating valve (9) and a medium-pressure stop valve (11), the medium-pressure air discharge main regulating valve (8) and the medium-pressure air discharge auxiliary regulating valve (9) are connected to an air discharge tower (3), an air discharge stop valve (12) is connected to an air discharge tower (3), an air intake side stop valve (13) of the main pipeline is connected to the low-pressure stop valve (10), the medium-pressure stop valve (11), the air discharge stop valve ( 12), the main regulating valve (14) of the main line is connected to the auxiliary regulating valve (15) of the main line, the main regulating valve (14) of the main line and the auxiliary regulating valve (15) of the main line are connected to the stable section (16), the stable section (16), the soft wall nozzle (17), the test section (18), and the main line exhaust side stop valve (19) are connected in sequence, the main line exhaust side stop valve (19) is connected to the exhaust main regulating valve (20), the exhaust auxiliary regulating valve (21), the air supply regulating valve (23), and the exhaust stop valve (25), the exhaust stop valve (25) is connected to the exhaust tower (26), the air supply regulating valve (23), the air supply stop valve (24), and the air supply tower (27) are connected in sequence, the exhaust main regulating valve (20) and the exhaust auxiliary regulating valve (21) are connected to the exhaust stop valve (22), and the exhaust stop valve (22) is connected to the exhaust device (28); A low-pressure pressure sensor (29) is installed on the pipeline between the low-pressure air intake stop valve (4) and the low-pressure stop valve (10), a medium-pressure pressure sensor (30) is installed on the pipeline between the medium-pressure air intake stop valve (5) and the medium-pressure stop valve (11), a stable section total pressure sensor (31) is installed in the stable section (16), a test section static pressure sensor (32) is installed in the test section (18), and an exhaust pressure sensor (33) is installed on the connecting pipeline between the main line exhaust side stop valve (19) and the exhaust main regulating valve (20), the exhaust auxiliary regulating valve (21), the air supply regulating valve (23), and the exhaust stop valve (25); the central controller (34) controls and adjusts all valves based on the pressure data collected by the low-pressure pressure sensor (29), the medium-pressure pressure sensor (30), the stable section total pressure sensor (31), the test section static pressure sensor (32), and the exhaust pressure sensor (33).

2. A multi-valve group continuously variable Mach number control device according to claim 1, characterized in that: The flexible wall nozzle (17) is designed to be symmetrical in the upper and lower directions. The upper flexible wall group (101) and the lower flexible wall group (102) are respectively installed on the upper wall (103) and the lower wall (104) of the nozzle. The upper flexible wall group (101) and the lower flexible wall group (102) each include a plurality of equally spaced action units (105) and a flexible wall plate (109). Each action unit (105) is composed of a motor (106), a reducer (107) and an elevator (108). The end of the elevator (108) of each action unit (105) is connected to the flexible wall plate (109). The nozzle controller (110) is connected to each action unit (105) via an EtherCAT real-time bus.

3. A multi-valve group continuously variable Mach number control device according to claim 2, characterized in that: During one profile movement, the nozzle controller (110) controls all the action units (105) of the upper flexible wall group (101) and the lower flexible wall group (102) to move synchronously, thereby causing the flexible wall plate (109) to move from profile A to profile B.

4. A multi-valve group continuously variable Mach number control device according to claim 3, characterized in that: The design flow rate of the low-pressure air release auxiliary regulating valve (7) is set to 1 / 4 of the design flow rate of the low-pressure air release main regulating valve (6), the design flow rate of the medium-pressure air release auxiliary regulating valve (9) is set to 1 / 4 of the design flow rate of the medium-pressure air release main regulating valve (8), the design flow rate of the main line auxiliary regulating valve (15) is set to 1 / 4 of the design flow rate of the main line main regulating valve (14), and the design flow rate of the exhaust auxiliary regulating valve (21) is set to 1 / 4 of the design flow rate of the exhaust main regulating valve (20).

5. A control method for a multi-valve group continuously variable Mach number control device, implemented by the multi-valve group continuously variable Mach number control device according to any one of claims 1 to 4, characterized in that: The steps include: S1. Establishing the corresponding relationship between the profile of the flexible wall nozzle (17) and the target Mach number through simulation calculation and profile calibration, and selecting the Mach number; S2. Based on the Mach number selected in step S1, determine the corresponding target value of the total pressure in the stable section and the target value of the static pressure in the test section, determine whether to use the low-pressure gas source (1) or the medium-pressure gas source (2) for gas supply, and determine the target value of the exhaust pressure or the target value of the low-pressure intake pressure or the target value of the medium-pressure intake pressure corresponding to the selected Mach number according to the test purpose; S3. The profile of the flexible wall nozzle (17) is controlled synchronously according to each selected Mach number discrete point, and the corresponding nozzle profile, stable section total pressure, test section static pressure, low pressure intake pressure and exhaust pressure are controlled synchronously, or the nozzle profile, stable section total pressure, test section static pressure, medium pressure intake pressure and exhaust pressure are controlled synchronously. When the intervals between the Mach numbers in the Mach number discrete points do not meet the requirements, linear interpolation is performed between the points to construct a parameter correspondence table of each variable in the process of continuously changing Mach number, and a multi-valve group continuously changing Mach number control device is controlled in real time.

6. The control method of a multi-valve group continuously variable Mach number control device according to claim 5, characterized in that: The calculation formula for determining the corresponding target value of the total pressure of the stable section and the target value of the static pressure of the test section in step S2 is: ； in, is the Mach number, is the total pressure in the stable section, is the static pressure of the test section.

7. The control method of a multi-valve group continuously variable Mach number control device according to claim 6, characterized in that: Step S3 uses an incremental PI closed-loop control method to synchronously control the target pressure of the low-pressure air release auxiliary regulating valve (7), the low-pressure air release main regulating valve (6), the medium-pressure air release auxiliary regulating valve (9), the medium-pressure air release main regulating valve (8), the main line auxiliary regulating valve (15), the main line main regulating valve (14), the air extraction auxiliary regulating valve (21), and the air extraction main regulating valve (20).

8. The control method of a multi-valve group continuously variable Mach number control device according to claim 7, characterized in that: The specific implementation method of step S3 includes the following steps: S3.

1. Close the low-pressure air intake stop valve (4), the medium-pressure air intake stop valve (5), the low-pressure air discharge main regulating valve (6), the low-pressure air discharge auxiliary regulating valve (7), the medium-pressure air discharge main regulating valve (8), the medium-pressure air discharge auxiliary regulating valve (9), the low-pressure stop valve (10), the medium-pressure stop valve (11), the main line air intake side stop valve (13), the main line main regulating valve (14), the main line auxiliary regulating valve (15), the main line air extraction side stop valve (19), the main air extraction regulating valve (20), the air extraction auxiliary regulating valve (21), the air extraction stop valve (22), the air supply regulating valve (23), the air supply stop valve (24), and the air exhaust stop valve (25). Open the air discharge stop valve (12) and keep the nozzle profile at the initial profile. ; S3.

2. Based on step S2, it is determined whether to use a low-pressure gas source (1) or a medium-pressure gas source (2) to supply gas, and to adjust and control the low-pressure target pressure or the medium-pressure target pressure; The low pressure target pressure is controlled by opening the low pressure intake stop valve (4), and after the low pressure pressure sensor (29) reading remains stable, opening the low pressure exhaust main regulating valve (6) for closed loop control, and after the low pressure pressure sensor (29) real-time reading Initial target value of low pressure sensor (29) When the relationship (1) is satisfied, the valve position of the low-pressure bleed main regulating valve (6) is kept unchanged, and the low-pressure bleed auxiliary regulating valve (7) is started to perform closed-loop control. The expression is: (1) in, is the error band of low pressure inlet pressure; The medium pressure target pressure is controlled by opening the medium pressure intake stop valve (5), and after the medium pressure sensor (30) reading remains stable, opening the medium pressure exhaust main regulating valve (8) to perform closed loop control, and after the medium pressure sensor (30) real-time reading and the initial target value of the medium pressure sensor (30) When the relationship (2) is satisfied, the valve position of the medium-pressure air release main regulating valve (8) is kept unchanged, and the medium-pressure air release auxiliary regulating valve (9) is started to perform closed-loop control. The expression is: (2) in, is the error band of the medium pressure inlet pressure; S3.

3. Based on the low-pressure target pressure regulation control or medium-pressure target pressure regulation control in step S3.2, open the low-pressure stop valve (10) or the medium-pressure stop valve (11), close the bleed stop valve (12), open the main line inlet side stop valve (13), open the main line main regulating valve (14) to perform closed-loop control, and read the total pressure sensor (31) in real time during the stable period. and the initial target value of the total pressure sensor (31) in the stable section When the relationship (3) is satisfied, the valve position of the main regulating valve (14) of the main line is kept unchanged, and the auxiliary regulating valve (15) of the main line is started to perform closed-loop control. The expression is: (3) in, is the error band of the total pressure in the stabilizing section; S3.

4. Open the air extraction stop valve (22) and the air supply stop valve (24). If the air extraction pressure sensor (33) reads and the initial target value of the exhaust pressure sensor (33) If the relationship (4) is satisfied, the main regulating valve (20) of the exhaust is opened for closed-loop control, and the real-time reading of the exhaust pressure sensor (33) is obtained. and the initial target value of the exhaust pressure sensor (33) When the relationship (5) is satisfied, the valve position of the main exhaust control valve (20) is kept unchanged, and the auxiliary exhaust control valve (21) is started to perform closed-loop control. When the relationship (6) is satisfied, the valve positions of the main exhaust control valve (20) and the auxiliary exhaust control valve (21) are kept unchanged, and the air supply control valve (23) is started to perform closed-loop control. The expression is: (4) (5) (6) in, is the error band of the pumping pressure; After step S3.1 to step S3.4, the test section has formed the initial Mach number ; S3.

5. The central controller (34) synchronously controls the nozzle profile, the main regulating valve (14) of the main pipeline, the low-pressure exhaust main regulating valve (6), the exhaust main regulating valve (20) or the air supply regulating valve (23) so that the nozzle profile, the total pressure of the stable section, the low-pressure exhaust pressure, and the exhaust pressure simultaneously reach Target value corresponding to the step 、 、 、 , at this time the Mach number is formed , repeat step S3.5 until all Mach number sequences are completed, where Mach number The nozzle profile below, Mach number The total pressure of the stable section under Mach number The low pressure sensor target value under Mach number The target value of the exhaust pressure sensor under

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