Frictional resistance calibrating device aiming at liquid crystal coating

A technology of liquid crystal coating and frictional resistance, which is applied in the field of frictional resistance calibration devices, can solve the problems of not meeting the test accuracy requirements, not easy to control, complicated methods, etc., and achieve simple structure, easy adjustment, and easy acquisition Effect

Active Publication Date: 2017-05-10
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous calibration methods usually rely on the establishment of a standard flow field, and then use other sensors for comparative measurement.

Method used

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  • Frictional resistance calibrating device aiming at liquid crystal coating
  • Frictional resistance calibrating device aiming at liquid crystal coating

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0022] The static friction force is used as the standard input required for calibration, so as to observe the response of the sensing element—the liquid crystal coating—to the friction force, and obtain the required calibration data. Liquid crystal coating is a material sensitive to shear force. When subjected to shear force, the wavelength of light reflected by the liquid crystal to the outside world will change, allowing people to observe the color change of the liquid crystal. The largest color change can be observed in the direction of . Therefore, a piece of glass can be placed on the surface of the liquid crystal coating, and the glass is in direct contact with the liquid crystal coating, and the weight is passed through the fixed pulley to apply a lateral pulling force (not greater than the maximum static friction force) to it. In the ac...

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Abstract

The invention discloses a frictional resistance calibrating device aiming at liquid crystal coating, and relates to a model surface friction measurement field of a wind tunnel test. The frictional resistance calibrating device comprises a glass disc, an outer cover, a tray, a measuring bench, a base, a fixed pulley, and a weight. The base is a disc mechanism, and is horizontally disposed on the lowest end. The measuring bench is fixedly disposed on the upper surface of the base, and the tray is fixedly disposed on the upper surface of the base. The glass disc is fixedly disposed on the upper surface of the tray, and the outer cover is fixedly disposed on the upper surface of the tray. The outer edge of the glass disc is fixedly by the outer cover in a limited way, and the fixed pulley is fixedly disposed on the edge part of the base. The weight is fixedly connected with the outer cover side edge by an inelastic rope, which is disposed on the fixed pulley. By using the frictional resistance calibrating device, results are acquired directly without help of other sensors, and the measurement results are not affected by the precision of the sensors, and then loading is easy to adjust and control, and the calibration precision is improved. The frictional resistance calibrating device has advantages of small device size, simple structure, high maintenance performance, economy, and practicability.

Description

technical field [0001] The invention relates to the field of model surface friction measurement in wind tunnel tests, in particular to a friction resistance calibration device for liquid crystal coatings. Background technique [0002] In the high-speed flight environment, the frictional resistance accounts for a large proportion of the total resistance of the aircraft, which not only affects the aerodynamic performance of the aircraft, but also has a great influence on the aerodynamic heat. As a basic work of fluid mechanics, friction prediction research has been paid attention to by people, and research institutions and universities all over the world have invested a lot of energy in researching friction resistance. Due to the influence of the flow state, especially when the flow transitions from laminar flow to turbulent flow under hypersonic conditions, there are certain difficulties in the prediction of friction in both wind tunnel experiments and numerical simulations. ...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01L1/24
CPCG01L1/24G01L5/0028G01L5/0033Y02T90/00
Inventor 姚大鹏陈星宫建文帅潘俊杰
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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