Measurement and visualization of surface friction beneath jet flow over planar surface using liquid crystal coatings

ZHAO Jisong; ZHANG Jinming; WANG Boqiao

doi:10.11729/syltlx20210106

Volume 36 Issue 2

May 2022

Turn off MathJax

Article Contents

Article Navigation > Journal of Experiments in Fluid Mechanics > 2022 > 36(2): 115-121

ZHAO J S，ZHANG J M，WANG B Q. Measurement and visualization of surface friction beneath jet flow over planar surface using liquid crystal coatings[J]. Journal of Experiments in Fluid Mechanics, 2022，36（2）：115-121. doi: 10.11729/syltlx20210106

Citation:

PDF( 7847 KB)

Measurement and visualization of surface friction beneath jet flow over planar surface using liquid crystal coatings

doi: 10.11729/syltlx20210106

College of Astronautics Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing　211106, China

Received Date: 2021-08-26
Accepted Date: 2021-12-13
Rev Recd Date: 2021-12-06

Available Online: 2022-05-26

Publish Date: 2022-05-19

Abstract

Abstract

The ability of Shear Sensitive Liquid Crystal （SSLC） coatings to measure and visualize surface friction fields is studied. Liquid crystal coatings are used to measure surface friction beneath the subsonic jet flow over a planar surface at various jet velocities, and to visualize unsteady surface friction fields of supersonic jet flow with shock cells. Experimental study shows that in terms of quantitative measurement, a single liquid crystal coating is able to measure surface friction rapidly with a high resolution and a wide range, and is also suitable for studying the variation of surface friction with the jet flow velocity. In the aspect of flow visualization, liquid crystal coatings provide another way for visualizing the flow field structures such as diamond shock cells of the supersonic jet flow and the unsteady characteristics of the shock cells.
- Shear Sensitive Liquid Crystal,
- surface friction,
- measurement,
- visualization,
- jet flow,
- shock waves

FullText(HTML)

References(23)

References

[1]	丁超,史志伟,玉曜瑜. 基于油膜干涉法的表面摩擦应力测量技术研究[J]. 实验力学,2011,26(6):707-714. DING C,SHI Z W,YU Y Y. Study of skin friction stress measurement technique based on oil film interferometry[J]. Journal of Experimental Mechanics,2011,26(6):707-714.
[2]	马洪强,高贺,毕志献. 高超声速飞行器相关的摩擦阻力直接测量技术[J]. 实验流体力学,2011,25(4):83-88. doi: 10.3969/j.issn.1672-9897.2011.04.016 MA H Q,GAO H,BI Z X. Direct measurement of skin friction for hypersonic flight vehicle[J]. Journal of Experiments in Fluid Mechanics,2011,25(4):83-88. doi: 10.3969/j.issn.1672-9897.2011.04.016
[3]	吕治国,李国君,赵荣娟,等. 激波风洞高超声速摩阻直接测量技术研究[J]. 实验流体力学,2013,27(6):81-85. doi: 10.3969/j.issn.1672-9897.2013.06.015 LÜ Z G,LI G J,ZHAO R J,et al. Direct measurement of skin friction at hypersonic shock tunnel[J]. Journal of Experiments in Fluid Mechanics,2013,27(6):81-85. doi: 10.3969/j.issn.1672-9897.2013.06.015
[4]	史云龙. 高超声速风洞模型表面摩阻测量技术研究 [D]. 绵阳: 中国空气动力研究与发展中心, 2015. SHI Y L. The research of model skin friction measurement technology in hypersonic wind tunnel [D]. Mianyang: China Aerodynamics Research and Development Center, 2015.
[5]	NAUGHTON J W,SHEPLAK M. Modern developments in shear-stress measurement[J]. Progress in Aerospace Sciences,2002,38(6-7):515-570. doi: 10.1016/S0376-0421(02)00031-3
[6]	REDA D C,MURATORE J J Jr. Measurement of surface shear stress vectors using liquid crystal coatings[J]. AIAA Journal,1994,32(8):1576-1582. doi: 10.2514/3.12146
[7]	REDA D C,WILDER M C,FARINA D J,et al. New methodology for the measurement of surface shear stress vector distributions[J]. AIAA Journal,1997,35(4):608-614. doi: 10.2514/2.165
[8]	REDA D C,WILDER M C,MEHTA R D,et al. Measurement of continuous pressure and shear distributions using coating and imaging techniques[J]. AIAA Journal,1998,36(6):895-899. doi: 10.2514/2.484
[9]	REDA D, MURATORE J Jr. A new technique for the measurement of surface shear stress vectors using liquid crystal coatings[C]//Proc of the 32nd Aerospace Sciences Meeting and Exhibit. 1994. doi: 10.2514/6.1994-729
[10]	FUJISAWA N, FUNATANI S, KOSAKA S. Measurement of shear-stress distribution by liquid-crystal coating[C]//Proc of SPIE 5058, Optical Technology and Image Processing for Fluids and Solids Diagnostics. 2003. doi: 10.1117/12.509840
[11]	FUJISAWA N,OGUMA Y,NAKANO T. Measurements of wall-shear-stress distribution on an NACA0018 airfoil by liquid-crystal coating and near-wall particle image velocimetry (PIV)[J]. Measurement Science and Technology,2009,20(6):065403. doi: 10.1088/0957-0233/20/6/065403
[12]	ZHAO J S,SCHOLZ P,GU L X. Color change characteristics of two shear-sensitive liquid crystal mixtures (BCN/192, BN/R50C) and their application in surface shear stress measurements[J]. Chinese Science Bulletin,2011,56(27):2897-2905. doi: 10.1007/s11434-011-4673-y
[13]	ZHAO J S,SCHOLZ P,GU L X. Measurement of surface shear stress vector distribution using shear-sensitive liquid crystal coatings[J]. Acta Mechanica Sinica,2012,28(5):1261-1270. doi: 10.1007/s10409-012-0144-1
[14]	陈星,文帅,潘俊杰,等. 三角翼标模摩擦阻力测量的高超声速风洞实验与数据确认[J]. 气体物理,2017,2(2):54-63. doi: 10.19527/j.cnki.2096-1642.2017.02.007 CHEN X,WEN S,PAN J J,et al. Delta wing model skin friction measurement test and data confirming in hypersonic wind tunnel[J]. Physics of Gases,2017,2(2):54-63. doi: 10.19527/j.cnki.2096-1642.2017.02.007
[15]	ZHAO J S. Measurement of wall shear stress in high speed air flow using shear-sensitive liquid crystal coating[J]. Sensors,2018,18(5):1605. doi: 10.3390/s18051605
[16]	ZHAO J S. Investigation on wall shear stress measurement in supersonic flows with shock waves using shear-sensitive liquid crystal coating[J]. Aerospace Science and Technology,2019,85:453-463. doi: 10.1016/j.ast.2018.12.034
[17]	赵吉松. 基于剪切敏感液晶涂层的壁面摩擦力矢量场全局测量方法[J]. 航空科学技术,2019,30(2):53-59. ZHAO J S. Measurement methods of wall shear stress vector field over planar surface using shear-sensitive liquid crystal coating[J]. Aeronautical Science and Technology,2019,30(2):53-59.
[18]	赵吉松. 平板表面薄圆柱绕流摩擦力矢量场全局测量[J]. 空气动力学学报,2020,38(1):27-34. doi: 10.7638/kqdlxxb-2018.0200 ZHAO J S. Global measurement of wall shear stress vector field over flat plate around thin cylinder[J]. Acta Aerodynamica Sinica,2020,38(1):27-34. doi: 10.7638/kqdlxxb-2018.0200
[19]	ZHAO J S,ZHANG J M,WANG B Q. A learning-based approach for solving shear stress vector distribution from shear-sensitive liquid crystal coating images[J]. Chinese Journal of Aeronautics,2021,35(4):55-65. doi: 10.1016/j.cja.2021.04.019
[20]	赵吉松. 基于剪切敏感液晶涂层的流道内壁面摩擦力场测量方法: CN109489934B[P]. 2021-04-06. ZHAO J S. Method for measuring friction field on inner wall of flow passage based on shear sensitive liquid crystal coating: CN109489934B[P]. 2021-04-06.
[21]	赵吉松, 朱博灵, 沈臻祺, 等. 一种应用液晶涂层和深度学习算法测量摩擦力场的方法: CN112326187A[P]. 2021-02-05. ZHAO J S, ZHU B L, SHEN Z Q, et al. Method for measuring friction field by applying liquid crystal coating and deep learning algorithm: CN112326187A[P]. 2021-02-05.
[22]	赵吉松, 李畅, 朱博灵, 等. 一种适用于任意照射和观测方向的液晶涂层颜色标定方法: CN112326186A[P]. 2021-02-05. ZHAO J S, LI C, ZHU B L, et al. Liquid crystal coating color calibration method suitable for any irradiation and observation direction: CN112326186A[P]. 2021-02-05.
[23]	TLC products for use in research and testing applications[EB/OL]. [2021-08-20]. https://www.lcrhallcrest.com/wp-content/uploads/2019/02/RD-TLC-Products-for-use-in-Research-Testing-Applications.pdf.