| 平板表面射流摩擦力场液晶涂层法测量与显示 |
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| 引用本文： | 赵吉松,张金明,王泊乔.平板表面射流摩擦力场液晶涂层法测量与显示[J].实验流体力学,2022,36(2):115-121. |
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| 作者姓名： | 赵吉松 张金明 王泊乔 |
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| 作者单位： | 南京航空航天大学 航天学院，南京 211106 |
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| 基金项目： | 国家自然科学基金（11602107）；中央高校基本科研业务费（NS2021059） |
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| 摘 要： | 为了研究剪切敏感液晶（Shear Sensitive Liquid Crystal，SSLC）涂层在不同气流速度下用于测量和显示壁面摩擦力场的能力，应用SSLC涂层对不同速度下平板表面亚声速射流的摩擦力矢量场进行了测量，对带有激波单元的超声速射流摩擦力场及其动态特性进行了流动显示。研究结果表明:在定量测量方面，SSLC涂层能够在宽量程范围内快速、高分辨率地测量射流摩擦力矢量场，可用于射流摩擦力场随射流速度的变化特性研究；在流动显示方面，SSLC涂层可用于显示超声速射流的菱形激波单元等流场结构及其动态变化特性。
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| 关 键 词： | 剪切敏感液晶 摩擦力 测量 显示 射流 激波 |
| 收稿时间： | 2021-08-26 |
Measurement and visualization of surface friction beneath jet flow over planar surface using liquid crystal coatings |
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| Affiliation: | College of Astronautics Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China |
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| 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. |
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