An ejection slot follow-up adjustment mechanism, flow field control method and system

Abstract

The present invention relates to the field of wind tunnel testing, and provides an ejector slot follow-up adjustment mechanism, a flow field control method and system, the mechanism comprising an ejector slot formed by a test section air-permeable wall panel and a test section solid wall panel located on both sides of the flow field, and a rotation center and a scimitar mechanism located in the middle of the flow field; and also comprising a servo motion mechanism, which is respectively connected to the test section solid wall panels on both sides of the flow field, and is used to drive the test section solid wall panels to control the opening of the ejector slot. During the test, the ejector slot opening on both sides of the flow field is adjusted according to the sideslip angle formed by the deflection of the scimitar mechanism. The present invention proposes a driving mechanism that can realize the continuous movement of the sideslip angle of the model, and the movement of the sideslip angle is completely decoupled from the movement of the angle of attack and does not affect each other; by introducing a servo motion mechanism to dynamically adjust the ejector slot opening according to the sideslip angle, the difference in the flow area on both sides of the scimitar mechanism can be minimized as much as possible, thereby reducing the asymmetry of the left and right flow fields, reducing the lateral deviation angle of the airflow, and better reducing the interference of the bracket.

Description

Technical Field

[0001] The invention relates to the field of wind tunnel testing, and in particular to an ejection slot follow-up adjustment mechanism, a flow field control method and a system. Background Art

[0002] The ejection slot is set near the support area of ​​the test section. Its main function is to eliminate support interference and reduce the range of the support interference area. The ejection slot opening can be adjusted to adapt to different Mach number states. In general, the ejection slot opening is adjusted in a left-right symmetrical static manner, that is, when the test Mach number is determined, the ejection slot opening is adjusted in advance, and then the wind tunnel is started for the blowing test. During the test, the ejection slot is fixed. Figure 1 However, this method is only applicable to the case where the scimitar mechanism of the test section is always located on the mid-axis plane of the flow field, that is, the left and right flow fields are basically symmetrical (except for the model area). When the scimitar mechanism moves, the traditional left-right symmetrical static adjustment method of the ejection slot opening is difficult to play a good role in eliminating interference. Summary of the invention

[0003] In view of the problems existing in the prior art, an ejector slot follow-up adjustment mechanism, a flow field control method and a system are provided, which can realize the continuous movement of the sideslip angle of the model, and the movement of the sideslip angle is completely decoupled from the movement of the angle of attack, and do not affect each other. At the same time, the ejector slot opening is dynamically adjusted according to the sideslip angle.

[0004] The first aspect of the present invention proposes an ejection slot follow-up adjustment mechanism, which is applied to a transonic wind tunnel test flow field, and includes a test section air-permeable wall panel and a test section solid wall panel located on both sides of the flow field, and a rotation center and a scimitar mechanism located in the middle of the flow field; for any side of the flow field, the test section air-permeable wall panel and the test section solid wall panel are adjacently arranged, and an ejection slot is formed at the junction; the scimitar mechanism is located between the ejection slots on both sides of the flow field, and rotates around the rotation center; and also includes a servo motion mechanism, which is respectively connected to the test section solid wall panels on both sides of the flow field, and is used to drive the test section solid wall panels to control the opening of the ejection slot.

[0005] As a preferred solution, one end of the solid wall panel of the test section is hinged, and the other end is connected to the air-permeable wall panel of the test section to form an injection gap; the servo motion mechanism changes the opening of the injection gap by pulling the solid wall panel of the test section.

[0006] As a preferred solution, the servo motion mechanism is a telescopic mechanism, one end of which is fixed to the solid wall plate of the test section, and the other end of which is fixed to the stationary chamber outside the flow field.

[0007] The second aspect of the present invention proposes a method for controlling the flow field of an ejector slot with follow-up adjustment, which is implemented based on the ejector slot follow-up adjustment mechanism described in the first aspect. During the test, the ejector slot opening on both sides of the flow field is adjusted according to the sideslip angle formed by the deflection of the scimitar mechanism.

[0008] As a preferred solution, the scimitar mechanism is in the side sliding zero position, that is, when no deflection occurs, the ejection slots on both sides are in a preset opening that is symmetrical on the left and right; wherein the preset opening is set according to the Mach number used in the test process.

[0009] As a preferred solution, when the scimitar mechanism is deflected, the opening of the introduction slot on one side of the scimitar mechanism increases as the sideslip angle increases, while the opening of the introduction slot on the other side decreases as the sideslip angle increases.

[0010] As a preferred solution, the method for adjusting the opening of the injection slit is specifically as follows:

[0011]

[0012]

[0013] in, is the preset opening of the left and right ejection slots corresponding to Mach, is the opening of the left injection slit, which faces the left side of the airflow. is the right injection slot opening, which faces the right side of the airflow. is the test model attack angle, is the sideslip angle of the scimitar mechanism, is the blockage coefficient of the test model; is the left side slip angle sine coefficient, is the first-order coefficient of the left slip angle, is the left side slip angle second order coefficient; is the right side slip angle sine coefficient, is the first-order coefficient of the right slip angle, is the second-order coefficient of the right slip angle.

[0014] A third aspect of the present invention provides a system, comprising a computer system and a computer program, wherein when the computer program is run by the computer system, the method described in the second aspect is executed.

[0015] Compared with the prior art, the beneficial effects of the above technical solution are as follows: the present invention proposes a driving mechanism that utilizes the scimitar mechanism to rotate around the rotation center to realize the sideslip angle movement of the model, which can realize the continuous movement of the sideslip angle of the model, and the movement of the sideslip angle is completely decoupled from the movement of the angle of attack and does not affect each other. In view of the situation that during the test, the movement causes the position of the scimitar mechanism in the flow field to change, thereby causing the asymmetry of the flow field in the bracket area, the present invention proposes a flow field control method, which can minimize the difference in the flow area on both sides of the scimitar mechanism by introducing a servo motion mechanism to dynamically adjust the opening of the ejection slot according to the sideslip angle, thereby reducing the asymmetry of the left and right flow fields, reducing the lateral deviation angle of the airflow, and better reducing the interference of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the flow field in the traditional test section.

[0017] Figure 2 This is a schematic diagram of the continuously variable sidesliding scimitar mechanism proposed in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the flow field of the large sideslip angle test section proposed in an embodiment of the present invention.

[0019] Figure 4 Schematic diagram of the ejection slit follow-up adjustment mechanism proposed in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the follow-up adjustment of the ejection slit under a large side-slip state proposed in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the flow field of the ejector slot follow-up adjustment under a large sideslip state proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limitations on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0023] Example 1

[0024] To achieve continuous sideslip angle motion of the model, please refer to Figure 2~Figure 3The present embodiment proposes an ejection slot follow-up adjustment mechanism, which is applied to a transonic wind tunnel test flow field, and includes a test section air-permeable wall panel and a test section solid wall panel located on both sides of the flow field, and a rotation center and a scimitar mechanism located in the middle of the flow field; for any side of the flow field, the test section air-permeable wall panel and the test section solid wall panel are adjacently arranged, and an ejection slot is formed at the junction; the scimitar mechanism is located between the ejection slots on both sides of the flow field, and rotates around the rotation center; and also includes a servo motion mechanism, which is respectively connected to the test section solid wall panels on both sides of the flow field, and is used to drive the test section solid wall panels to control the opening of the ejection slot.

[0025] Please refer to Figure 4 , one end of the solid wall plate of the test section is hinged, and the other end is connected with the air-permeable wall plate of the test section to form an ejection slit; the servo motion mechanism changes the opening of the ejection slit by pulling the solid wall plate of the test section. In a preferred embodiment, the servo motion mechanism is a telescopic mechanism, one end of which is fixed to the solid wall plate of the test section, and the other end is fixed to the stationary room outside the flow field.

[0026] In the ejection slot follow-up adjustment mechanism proposed in this embodiment, the scimitar mechanism can realize the side slip angle movement of the model by moving around the rotation center. Its advantage is that the continuous movement of the side slip angle of the model can be realized, and the movement of the side slip angle is completely decoupled from the movement of the angle of attack and does not affect each other.

[0027] Example 2

[0028] This embodiment proposes a method for controlling the flow field by following the ejection slot adjustment, which is implemented based on the ejection slot following adjustment mechanism proposed in Example 1. During the test, the ejection slot openings on both sides of the flow field are adjusted according to the side slip angle formed by the deflection of the scimitar mechanism.

[0029] Specifically, during the test, the movement of the model will cause the position of the scimitar mechanism in the flow field to change, which will cause the asymmetry of the flow field in the bracket area. Please refer to Figure 3 In the process of using the mechanism to carry out wind tunnel tests, the traditional left-right symmetrical static adjustment of the ejection slot opening is difficult to play a good role in eliminating interference. Therefore, this embodiment proposes a flow field control method by dynamically adjusting the ejection slot opening.

[0030] Please refer to Figure 5 When the scimitar mechanism deflects, the ejection slot on one side of the scimitar mechanism increases in opening as the sideslip angle increases, while the ejection slot on the other side decreases in opening as the sideslip angle increases. It should be noted that when the scimitar mechanism is in the sideslip zero position, that is, when no deflection occurs, the ejection slots on both sides are at preset openings that are symmetrical on the left and right; the preset openings are set according to the Mach number used in the test process. Please refer to Figure 6 At this time, the difference in flow area on both sides of the scimitar mechanism can be minimized as much as possible, thereby reducing the asymmetry of the left and right flow fields, reducing the lateral deflection angle of the airflow, and better reducing the interference of the bracket.

[0031] In order to more accurately adjust the opening of the ejection slit, this embodiment also proposes a specific method for calculating the opening of the ejection slit, which is as follows:

[0032]

[0033]

[0034] in, To correspond to the preset opening of the left and right ejection slots under Mach, the preset opening can be set according to the static adjustment method. is the opening of the left injection slit, which faces the left side of the airflow. is the right injection slot opening, which faces the right side of the airflow. is the test model attack angle, is the sideslip angle of the scimitar mechanism, is the blockage coefficient of the test model; is the left side slip angle sine coefficient, is the first-order coefficient of the left slip angle, is the left side slip angle second order coefficient; is the right side slip angle sine coefficient, is the first-order coefficient of the right slip angle, It is the second-order coefficient of the right sliding angle. It should be noted that the parameters required for calculating the opening of the ejection slot can be obtained during the test, and the ejection slot opening can be accurately controlled based on the obtained parameters.

[0035] In one embodiment, a system is also proposed, including a computer system and a computer program. When the computer program is run by the computer system, the method for controlling the ejector slot follow-up flow field is executed.

[0036] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer readable medium, and the computer program includes a program code for executing the method shown in the flowchart.

[0037] It should be noted that the computer-readable medium shown in the embodiment of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0038] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0039] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0040] As another aspect, the present application further provides a computer program product or a computer program, the computer program product or the computer program including computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the ejection slot follow-up adjustment flow field control method described in the above embodiment.

[0041] As another aspect, the present application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the ejection slot follow-up adjustment flow field control method described in the above embodiment.

[0042] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0043] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software, or by combining software with necessary hardware. Therefore, the technical solution according to the implementation method of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation method of the present application.

[0044] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific situations; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling the flow field of an ejection slot with dynamic adjustment, characterized in that: The ejection slot follow-up adjustment mechanism is implemented based on the ejection slot follow-up adjustment mechanism, which is applied to the transonic wind tunnel test flow field, including the test section air-permeable wall panel and the test section solid wall panel located on both sides of the flow field, and the rotation center and the scimitar mechanism located in the middle of the flow field; for any side of the flow field, the test section air-permeable wall panel and the test section solid wall panel are arranged adjacent to each other, and an ejection slot is formed at the junction; the scimitar mechanism is located between the ejection slots on both sides of the flow field, and rotates around the rotation center; it also includes a servo motion mechanism, which is respectively connected to the test section solid wall panels on both sides of the flow field, and is used to drive the test section solid wall panels to control the opening of the ejection slot; the ejection slot follow-up adjustment flow field control method includes: during the test process, according to the sideslip angle formed by the deflection of the scimitar mechanism, adjusting the ejection slot opening on both sides of the flow field; when the scimitar mechanism deflects, the ejection slot on one side of the scimitar mechanism increases its opening as the sideslip angle increases, and the ejection slot on the other side decreases its opening as the sideslip angle increases; the ejection slot opening adjustment method is specifically as follows: in, is the preset opening of the left and right ejection slots corresponding to Mach, is the opening of the left injection slit, which faces the left side of the airflow. is the right ejector slot opening, which faces the right side of the airflow. is the test model attack angle, is the sideslip angle of the scimitar mechanism, is the blockage coefficient of the test model; is the left side slip angle sine coefficient, is the first-order coefficient of the left slip angle, is the left side slip angle second coefficient; is the right side slip angle sine coefficient, is the first-order coefficient of the right slip angle, is the second-order coefficient of the right slip angle.

2. The method for controlling the flow field of the ejection slot according to claim 1, characterized in that: One end of the solid wall plate of the test section is hinged, and the other end is connected with the air-permeable wall plate of the test section to form an injection slit; the servo motion mechanism changes the opening of the injection slit by pulling the solid wall plate of the test section.

3. The method for controlling the flow field of the ejection slot according to claim 1, characterized in that: The servo motion mechanism is a telescopic mechanism, one end of which is fixed on the solid wall plate of the test section, and the other end is fixed in the stationary chamber outside the flow field.

4. The method for controlling the flow field of the ejection slot according to claim 1, characterized in that: The scimitar mechanism is in the side-slip zero position, that is, when no deflection occurs, the ejection slots on both sides are in a preset opening that is symmetrical on the left and right; wherein the preset opening is set according to the Mach number used in the test process.

5. A system, characterized in that: The invention comprises a computer system and a computer program. When the computer program is run by the computer system, the method according to any one of claims 1 to 4 is executed.

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