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Investigation on wall shear stress measurement in supersonic flows with shock waves using shear-sensitive liquid crystal coating

机译：剪切敏感液晶涂层在超声速冲击波中测量壁面剪应力的研究

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Wall shear stress (skin friction) is one of the fundamental surface quantities in aerodynamics but its measurement remains challenging. This paper studies the measurement of wall shear stress vector fields in supersonic flows with shock waves using the shear-sensitive liquid crystal coating (SSLCC) technique. A previously developed SSLCC technique was improved and used for the measurement of wall shear stresses in a supersonic jet flow. Experimental results show that the flow structures including shock waves in the supersonic jet flow were visualized by the SSLCC technique; furthermore, the shear stress vector field over a planar surface induced by the supersonic jet flow was measured by the SSLCC technique. The shock waves and the compression-expansion repetitions in the supersonic jet flow were captured, respectively, by analysing the shear direction field and the skin friction line pattern. This work demonstrates the capabilities of the SSLCC technique to visualize and measure wall shear stresses in supersonic flows with complex shock waves. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：壁剪应力（皮肤摩擦）是空气动力学中基本的表面量之一，但其测量仍然具有挑战性。本文研究了利用剪切敏感液晶涂层（SSLCC）技术测量超声速流中冲击波壁剪切应力矢量场的过程。改进了先前开发的SSLCC技术，并将其用于测量超音速射流中的壁切应力。实验结果表明，采用SSLCC技术可以观察到超声速射流中包括冲击波在内的流动结构。此外，通过SSLCC技术测量由超声速射流引起的平面上的切应力矢量场。通过分析剪切方向场和皮肤摩擦线模式，分别捕获了超声速射流中的冲击波和压缩-膨胀重复。这项工作证明了SSLCC技术能够可视化和测量具有复杂冲击波的超音速流动中的壁切应力。 （C）2019 Elsevier Masson SAS。版权所有。

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