Measurement of surface shear stress vector distribution using shear-sensitive liquid crystal coatings

The global wall shear stress measurement tech- nique using shear-sensitive liquid crystal （SSLC） is extended to wind tunnel measurements. Simple and common every- day equipment is used in the measurement; in particular a tungsten-halogen light bulb provides illumination and a saturation of SSLC coat...

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Bibliographic Details
Published in:Acta mechanica Sinica 2012-10, Vol.28 (5), p.1261-1270
Main Authors: Zhao, Ji-Song, Scholz, Peter, Gu, Liang-Xian
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Coatings
Computational Intelligence
Cylinders
Engineering
Engineering Fluid Dynamics
Fluid flow
Illumination
Liquid crystals
Research Paper
Stress concentration
Theoretical and Applied Mechanics
Wall shear stresses
Wind tunnels
剪切应力分布
壁面剪切应力
应力矢量
敏感
测量技术
液晶
膜表面
风洞测量
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Summary:The global wall shear stress measurement tech- nique using shear-sensitive liquid crystal （SSLC） is extended to wind tunnel measurements. Simple and common every- day equipment is used in the measurement; in particular a tungsten-halogen light bulb provides illumination and a saturation of SSLC coating color change with time is found. Spatial wall shear stress distributions of several typical flows are obtained using this technique, including wall-jet flow, vortex flow generated by a delta wing and junction flow behind a thin cylinder, although the magnitudes are not fully calibrated. The results demonstrate that SSLC technique can be extended to wind tunnel measurements with no complicated facilities used.
ISSN:0567-7718
1614-3116
DOI:10.1007/s10409-012-0144-1