A multi-valve coordinated transient wind tunnel flow field control method and device

Abstract

The present invention discloses a multi-valve coordinated temporary wind tunnel flow field control method and device, which belongs to the field of wind tunnel flow field control technology. It solves the problem in the prior art that the traditional temporary wind tunnel flow field control method and device are difficult to ensure the flow field control accuracy; the present invention deploys a temporary wind tunnel flow field control device, sets the flow relationship between the bypass pipeline and the main pipeline; before the test run, obtains the initial opening of the main pipeline pressure regulating valve; presets the main pipeline pressure regulating valve to the initial opening, and presets the bypass pressure regulating valve to 50% opening; starts the test run, places the bypass pressure regulating valve in the current position and does not move, adjusts the wind tunnel total pressure or wind tunnel Mach number through the main pipeline pressure regulating valve to reach a preliminary stable state; adjusts the wind tunnel total pressure or wind tunnel Mach number through the bypass pressure regulating valve to reach a stable state. The present invention improves the control accuracy of the temporary wind tunnel flow field, can ensure the flow field control accuracy when the performance of the main pipeline pressure regulating valve equipment declines, and can be used to control the temporary wind tunnel flow field.

Description

Technical Field

[0001] The present invention relates to a temporary-rush wind tunnel flow field control method and device, and in particular to a multi-valve coordinated temporary-rush wind tunnel flow field control method and device, belonging to the technical field of wind tunnel flow field control. Background Art

[0002] Wind tunnel testing is an important technical means of verifying the aerodynamic characteristics of aviation and aerospace vehicles. The performance of the wind tunnel flow field plays a decisive role in the accuracy, authenticity, and reliability of the test results. Flow field control accuracy is a key indicator of flow field performance. Temporary wind tunnels generally regulate the wind tunnel flow field through a single pressure regulating valve. Given the small diameter of the wind tunnel and the wide range of air source pressures, minute adjustments to the flow rate are necessary, requiring the pressure regulating valve to possess extremely high sensitivity and operational precision, significantly increasing the design difficulty of the pressure regulating valve and its control system. Furthermore, as the equipment's operating time increases, there is a risk of performance degradation and difficulty maintaining flow field control accuracy.

[0003] In summary, a method and device for controlling the flow field of a temporary wind tunnel with stable performance and multi-valve coordination is needed. Summary of the Invention

[0004] A brief overview of the present invention is provided below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important aspects of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description discussed later.

[0005] In view of this, in order to solve the problem in the prior art that the traditional transient wind tunnel flow field control method and device are difficult to ensure the flow field control accuracy, the present invention provides a transient wind tunnel flow field control method and device with multi-valve coordination.

[0006] Technical Solution 1 is as follows: A multi-valve coordinated transient wind tunnel flow field control method includes the following steps:

[0007] S1. Install the temporary wind tunnel flow field control device and set the flow relationship between the bypass pipe and the main pipe;

[0008] S2. Before the test, determine the initial opening of the main line pressure regulating valve using a table lookup method based on the current gas source pressure, the target total pressure, and the target Mach number, taking into account the flow rate relationship.

[0009] S3. Preset the main line pressure regulating valve to the initial opening and the bypass pressure regulating valve to 50% opening;

[0010] S4. Start the test run. Open the quick valve of the transient wind tunnel flow field. Leave the bypass pressure regulating valve at its current position. Adjust the wind tunnel total pressure or wind tunnel Mach number through the main line pressure regulating valve to achieve a preliminary stable state.

[0011] S5. Leave the main line pressure regulating valve at its current position and adjust the wind tunnel total pressure or wind tunnel Mach number to a stable state through the bypass pressure regulating valve.

[0012] Furthermore, in S4, the total pressure in the wind tunnel is initially stable. ,in, is the total wind tunnel pressure and target total pressure The initial stable state of the wind tunnel Mach number is ,in, is the wind tunnel Mach number and target Mach number The difference.

[0013] Furthermore, in said S5, the wind tunnel total pressure is in a stable state. , the Mach number steady state is .

[0014] Technical Solution 2 is as follows: A multi-valve coordinated temporary impulsion wind tunnel flow field control device, used to implement the multi-valve coordinated temporary impulsion wind tunnel flow field control method described in Technical Solution 1, comprising a bypass pressure regulating valve, a main line pressure regulating valve, and a bypass pipe;

[0015] The inlet and outlet of the bypass pipe are connected to the main pipe of the temporary wind tunnel flow field, and the bypass pipe is parallel to the main pipe. A bypass pressure regulating valve is provided in the bypass pipe, and a main pressure regulating valve is provided in the main pipe.

[0016] The beneficial effects of the present invention are as follows: the multi-valve coordinated temporary impulsion wind tunnel flow field control method and device described in the present invention are suitable for temporary impulsion wind tunnel flow field control, and can conveniently realize fine adjustment of the wind tunnel flow field through the coordinated operation of the main line pressure regulating valve and the bypass pressure regulating valve, thereby reducing the difficulty of pressure regulating valve design; the multi-valve coordinated temporary impulsion wind tunnel flow field control method and device described in the present invention can conveniently realize fine adjustment of the wind tunnel flow field through the coordinated operation of the main line pressure regulating valve and the bypass pressure regulating valve, and can ensure the flow field control accuracy when the performance of the main line pressure regulating valve equipment declines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1The figure is a flow chart of a multi-valve coordinated transient wind tunnel flow field control method;

[0019] Figure 2 This is a schematic diagram of the structure of a multi-valve coordinated temporary impulse wind tunnel flow field control device;

[0020] Figure 3 The figure is a flow chart of an embodiment of a multi-valve coordinated transient wind tunnel flow field control method.

[0021] Figure numerals: 1. Bypass pressure regulating valve; 2. Main line pressure regulating valve; 3. Bypass pipeline; 4. Main line pipeline. DETAILED DESCRIPTION

[0022] To make the technical solutions and advantages of the embodiments of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be noted that the embodiments described are only a portion of the embodiments of the present invention, and are not an exhaustive list of all embodiments. It should be noted that the embodiments of the present invention and the features thereof may be combined with each other unless they conflict.

[0023] Example 1: Reference Figure 1-Figure 3 The present embodiment is described in detail. A method for controlling the flow field of a transient wind tunnel with multiple valves in coordination includes the following steps:

[0024] S1. Install the temporary wind tunnel flow field control device and set the flow relationship between the bypass pipe and the main pipe;

[0025] S2. Before the test, determine the initial opening of the main line pressure regulating valve using a table lookup method based on the current gas source pressure, the target total pressure, and the target Mach number, taking into account the flow rate relationship.

[0026] S3. Preset the main line pressure regulating valve to the initial opening and the bypass pressure regulating valve to 50% opening;

[0027] S4. Start the test run. Open the quick valve of the transient wind tunnel flow field. Leave the bypass pressure regulating valve at its current position. Use the main line pressure regulating valve to adjust the wind tunnel total pressure (for supersonic conditions) or the wind tunnel Mach number (for subsonic conditions) to achieve a preliminary stable state.

[0028] S5. Leave the main line pressure regulating valve at its current position and adjust the wind tunnel total pressure or wind tunnel Mach number to a stable state through the bypass pressure regulating valve.

[0029] Specifically, in S1, a bypass pipe 3 and a bypass pressure regulating valve 1 are added outside the main line pressure regulating valve 2. The maximum flow of the bypass pipe 3 is about 1 / 3 of the maximum flow of the main line pipe 4. The quick valve is located in front of the pressure regulating valve and serves as a stop valve at the front end of the wind tunnel.

[0030] Furthermore, in S4, the total pressure in the wind tunnel is initially stable. ,in, is the total wind tunnel pressure and target total pressure The initial stable state of the wind tunnel Mach number is ,in, is the wind tunnel Mach number and target Mach number The difference.

[0031] Furthermore, in said S5, the wind tunnel total pressure is in a stable state. , the Mach number steady state is , it is considered stable if the above conditions are met for 20 consecutive control cycles.

[0032] Example 2: Reference Figure 2 This embodiment is described in detail. A multi-valve coordinated temporary impulsion wind tunnel flow field control device is used to implement the multi-valve coordinated temporary impulsion wind tunnel flow field control method described in Example 1, comprising a bypass pressure regulating valve 1, a main line pressure regulating valve 2, and a bypass pipe 3;

[0033] The inlet and outlet of the bypass pipe 3 are connected to the main pipe 4 of the temporary wind tunnel flow field, and the bypass pipe 3 is parallel to the main pipe 4. A bypass pressure regulating valve 1 is provided in the bypass pipe 3, and a main pressure regulating valve 2 is provided in the main pipe 4.

[0034] Specifically, refer to Figure 2 , the arrows indicate the direction of airflow.

[0035] Although the present invention has been described with respect to a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the present invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative rather than restrictive of the scope of the invention, which is defined by the appended claims.

Claims

1. A multi-valve coordinated transient wind tunnel flow field control method, characterized in that: The following steps are involved: S1. Install the temporary wind tunnel flow field control device and set the flow relationship between the bypass pipe and the main pipe; S2. Before the test, determine the initial opening of the main line pressure regulating valve using a table lookup method based on the current gas source pressure, the target total pressure, and the target Mach number, taking into account the flow rate relationship. S3. Preset the main line pressure regulating valve to the initial opening and the bypass pressure regulating valve to 50% opening; S4. Start the test run. Open the quick valve of the transient wind tunnel flow field. Leave the bypass pressure regulating valve at its current position. Adjust the wind tunnel total pressure or wind tunnel Mach number through the main line pressure regulating valve to achieve a preliminary stable state. S5. Leave the main line pressure regulating valve at its current position and adjust the wind tunnel total pressure or wind tunnel Mach number to a stable state through the bypass pressure regulating valve.

2. The multi-valve coordinated transient wind tunnel flow field control method according to claim 1, characterized in that: In S4, the initial stable state of the total pressure in the wind tunnel is ,in, is the total wind tunnel pressure and target total pressure The initial stable state of the wind tunnel Mach number is ,in, is the wind tunnel Mach number and target Mach number The difference.

3. The multi-valve coordinated transient wind tunnel flow field control method according to claim 2, characterized in that: In S5, the wind tunnel total pressure is in a stable state. , the Mach number steady state is .

4. A multi-valve coordinated temporary flow control device for a wind tunnel, characterized in that: A method for realizing a multi-valve coordinated temporary flow field control method of a wind tunnel as claimed in any one of claims 1 to 3, comprising a bypass pressure regulating valve (1), a main line pressure regulating valve (2) and a bypass pipe (3); The inlet and outlet of the bypass pipe (3) are connected to the main pipe (4) of the temporary wind tunnel flow field, and the bypass pipe (3) and the main pipe (4) are parallel. A bypass pressure regulating valve (1) is provided in the bypass pipe (3), and a main pressure regulating valve (2) is provided in the main pipe (4).

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