A small wind speed precision control method for low speed return wind tunnel

A precision control and small wind speed technology, applied in the field of wind tunnel experiments, can solve the problems of large precision control error, failure to start the wind speed control system, and no longer applicable, so as to expand the experimental range and improve the small wind speed control accuracy.

Inactive Publication Date: 2020-06-02
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

[0007] The above-mentioned wind speed control method is very suitable for controlling the accuracy of large wind speeds, but it is no longer suitable for controlling the accuracy of small wind speeds, and the precision control error is relatively large. Unable to start

Method used

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  • A small wind speed precision control method for low speed return wind tunnel
  • A small wind speed precision control method for low speed return wind tunnel
  • A small wind speed precision control method for low speed return wind tunnel

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] A low-speed backflow wind tunnel precision control method for small wind speeds, comprising the following steps:

[0027] Step 1: first modify the wall 1 of the stable section, and process four vent holes 2 on the wall 1 of the stable section, and the four vent holes 2 are evenly distributed on the wall 1 of the stable section along the circumferential direction;

[0028] Step 2: Machining a sealing groove on the outer surface of the wall 1 of the stable section on both sides of the vent hole 2, and then embedding a sealing strip 3 in the sealing groove;

[0029] Step 3: Make a deflation volume control sleeve 4, put the deflation volume control sleeve 4 on the outer side of the stable section hole wall 1, and set several A guide rail 5, the guide rail 5 is fixedly connected with the outer surface of the wall 1 of the stable se...

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Abstract

A small wind speed precision control method for a low-speed return wind tunnel comprises the following steps: processing a venting hole in a stable section wall; installing sealing strips on both sides of the venting hole; making a venting amount control sleeve and mounting a guide rail; mounting a rack; setting up a stepping motor and mounting a gear, and connecting the control end of the stepping motor to the wind tunnel system computer; installing a wind speed probe in the wind tunnel test section, and connecting the wind speed probe to the computer through a micro differential pressure sensor; isolating the venting amount control sleeve and the venting hole to the outside; starting the wind tunnel, measuring the actual wind speed in the wind tunnel test section, comparing the actual wind speed with a set wind speed through the computer, sending a control command to the stepping motor by the computer, driving the venting amount control sleeve to move by the stepping motor such thatthe venting hole is communicated to the outside, the communication area between the venting hole and the outside is increased at a constant rate, and the actual wind speed in the wind tunnel test section will gradually decrease, and immediately stopping the stepping motor when the actual wind speed in the wind tunnel test section reaches the set wind speed.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel experiments, and in particular relates to a small wind speed precision control method in a low-speed backflow wind tunnel. Background technique [0002] A wind tunnel is a pipe-like experimental device that can generate and control airflow artificially to simulate the flow of air around an aircraft or entity, measure the effect of airflow on the entity and observe physical phenomena. Wind tunnel experiment is an indispensable part of aircraft development. It not only plays an important role in the research and development of aviation and aerospace engineering, but also plays an important role in transportation, housing construction, wind energy utilization, etc. with the development of industrial aerodynamics. field is indispensable. When conducting wind tunnel experiments, the model or object is often fixed in the wind tunnel for repeated blowing, and the experimental data is obtained throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/02
Inventor 李国文王成军朱建勇张庆营
Owner SHENYANG AEROSPACE UNIVERSITY
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