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

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...

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

Images