A Calculation Method of Transition Surface in High Speed Wind Tunnel Test Section with Variable Section Shape
A high-speed wind tunnel and test section technology, applied in the field of wind tunnel test, can solve problems such as the change of the flow field characteristics of the wind tunnel test section, and achieve the effect of expanding the local scope of the workspace, strong practicability, and strong adaptability
Active Publication Date: 2021-08-10
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
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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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The invention discloses a transition profile calculation method for a variable cross-section shape high-speed wind tunnel test section. The transitional surface calculation method adopts cubic curve, double cubic curve and quintic curve to design the transitional surface; through computer numerical simulation, the rectangular cross-section test section of the transitional surface of cubic curve, double cubic curve and quintic curve is respectively obtained The cloud image of the velocity distribution at the entrance, evaluate whether the flow field of the test section meets the requirements of the high-speed wind tunnel test, exclude the curves that do not meet the requirements, and keep the curves that meet the requirements; evaluate the processing technology of the curves that meet the requirements, and determine the cubic curve as the transitional surface molding line. The transitional surface calculation method is suitable for transforming the existing high-speed wind tunnel and expanding the test field of the existing high-speed wind tunnel, and has strong 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...
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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