Transition profile calculation method for variable cross-section shape high-speed wind tunnel test section

A technology of high-speed wind tunnel and test section, which is applied in the field of wind tunnel test, can solve the problems such as the change of flow field characteristics in the wind tunnel test section, achieve the effect of expanding the local area of ​​the working space, simple design method, and expanding the test field

Active Publication Date: 2021-03-26
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

Since the test area is moved back by the rectangular cross-section test section and undergoes two surface transitions, the flow field characteristics of the wind tunnel test section may change greatly

Method used

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  • Transition profile calculation method for variable cross-section shape high-speed wind tunnel test section
  • Transition profile calculation method for variable cross-section shape high-speed wind tunnel test section
  • Transition profile calculation method for variable cross-section shape high-speed wind tunnel test section

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Embodiment 1

[0041] The rectangular cross-section test section of this embodiment is applied to a 2.4m×2.4m transonic wind tunnel, and it is necessary to transition the 2.4m×2.4m square entrance size to a 3.0m×1.92m rectangular wind tunnel with a length of 2m. The size of the hole test section, and then transition to the opening size of 2.4m x 2.4m through the symmetrical profile, and the rectangular section test section moved the test area back by 2 meters.

[0042]According to the transition profile solution method of the variable cross-section shape high-speed wind tunnel test section of the present invention, respectively adopt cubic curve, bi-cubic curve, and quintic curve to design the transition profile, the profile curve diagram obtained is shown in image 3 See Figure 4 .

[0043] from image 3 It can be seen that the velocity distribution of the flow field in the rectangular cross-section test section of the profile curve of the cubic curve, bi-cubic curve, and quintic curve i...

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Abstract

The invention discloses a transition profile calculation method for a variable cross-section shape high-speed wind tunnel test section. According to the transition profile calculation method, a cubiccurve, a bicubic curve and a quintic curve are adopted to design a transition profile; through computer numerical simulation, speed distribution cloud charts of rectangular section test section inletsof transition profiles of the cubic curve, the bicubic curve and the quintic curve are obtained respectively, whether a test section flow field meets high-speed wind tunnel test requirements or not is evaluated, curves which do not meet the requirements are excluded, and curves which meet the requirements are reserved; and machining process evaluation is carried out on the curves meeting the requirements, and the cubic curve is determined as the molded line of the transition profile. The transition profile calculation method is suitable for transforming an existing high-speed wind tunnel, expands the test field of the existing high-speed wind tunnel, and has high adaptability and high application value.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a method for calculating a transition profile of a variable cross-section high-speed wind tunnel test section. Background technique [0002] A wind tunnel is a ground pipe-like device that artificially generates and controls airflow, and is mainly used for the research of aerodynamic performance of aerospace vehicle models under different attitudes or different flow conditions. In a high-speed wind tunnel, the wind tunnel test section is the basic platform for carrying out various tests and providing aerodynamic measurement and pressure distribution measurement for different types of tests. Due to the wide variety of tests and different test purposes, a single wind tunnel test section cannot complete the test tasks of all projects. Therefore, for specific test content and projects, it is necessary to build a corresponding wind tunnel test section to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/02
CPCG01M9/02
Inventor 王瑞波吴军强林学东徐来武张林吴继飞魏志曾利权刘琴虞择斌杨洋刘光远陈学孔邓吉龙贾智亮
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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