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Surface frictional resistance wind tunnel measurement method based on box type frictional resistance balance

A frictional resistance, wind tunnel measurement technology, applied in measurement devices, machine/structural component testing, aerodynamic testing, etc., can solve the problem of difficulty in resisting pressure gradient load interference on the test surface and temperature interference, weak self-rigidity, and difficulty in operation. Large and other problems, to achieve good thermal insulation protection, prevent channeling from entering, and reduce the effect of temperature conduction

Active Publication Date: 2020-05-19
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MEMS friction sensor has complex process, high cost, weak self-rigidity, difficult operation, and weak anti-interference ability
Strain balance or capacitive balance has a simple structure, mainly using one or two vertical beams as the measuring element, which is difficult to resist the pressure gradient load interference and temperature interference on the test surface, and the measurement error is large

Method used

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  • Surface frictional resistance wind tunnel measurement method based on box type frictional resistance balance
  • Surface frictional resistance wind tunnel measurement method based on box type frictional resistance balance
  • Surface frictional resistance wind tunnel measurement method based on box type frictional resistance balance

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Embodiment 1

[0086] The test wind tunnel of this embodiment is a hypersonic wind tunnel. The test model 11 of the present embodiment is a flat plate model, and the lower surface of the front edge of the test model 11 is processed with wedges facing the incoming flow of the wind tunnel.

[0087] The test results show that the box-type friction resistance balance used in the wind tunnel measurement method of surface friction resistance based on the box-type friction resistance balance of the present invention can measure the friction resistance in the range of 0.2N to 5N, and the minimum resolution is 0.001N. Accurate measurement under the normal force of 100N, pitching moment of 5N m and other disturbance loads of comparable magnitude.

[0088] The test results prove that the surface friction resistance wind tunnel measurement method based on the box friction resistance balance of the present invention has low cost, high performance and easy operation.

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Abstract

The invention discloses a surface frictional resistance wind tunnel measurement method based on a box type frictional resistance balance. According to the method, a special box type frictional resistance balance is used. The method comprises the following steps: 1, ; processing and calibrating the box type frictional resistance balance; inputting a resistance calculation formula of the box-type frictional resistance balance into a wind tunnel data collection system; design processing test model, a test model is installed in a wind tunnel, a box-type frictional resistance balance is installed in the wind tunnel, a measuring part is fixed on an upper connecting cover of the box-type frictional resistance balance, the width of a narrow slit among a model front cover plate, the measuring partand a model rear cover plate is adjusted, a balance line is connected to a wind tunnel data collection system, and the posture of the test model is adjusted to carry out a wind tunnel test. The box type frictional resistance balance special for the method has good temperature response capability and has overload protection and heat insulation protection functions. The method is low in cost, good in benefit, easy to operate, and especially suitable for accurate measurement of aircraft surface frictional resistance in high-speed and hypersonic wind tunnels.

Description

technical field [0001] The invention belongs to the technical field of high-speed wind tunnel tests, and in particular relates to a wind tunnel measurement method for surface frictional resistance based on a box-type frictional resistance balance. Background technique [0002] Surface friction is the resultant force of the shear force on the surface of the aircraft, and is an important part of the aircraft's drag. Its accurate measurement is of great significance to the design of the aircraft. At present, there is still a lack of reliable and accurate measurement methods for frictional resistance measurement. The known relatively accurate measurement methods are mainly MEMS (micro-electromechanical system) methods, strain balance measurement methods, and capacitive balance measurement methods. The MEMS friction sensor has complex process, high cost, weak self-rigidity, difficult operation, and weak anti-interference ability. The strain balance or capacitive balance has a si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/062
Inventor 张长丰潘华烨苗磊贾巍彭超马涛
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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