论文部分内容阅读
剪切敏感液晶涂层具有对剪切应力敏感的光学特性,液晶涂层的显色不但与所受到的应力大小有关,而且与应力方向有关。在白色光垂直照射下,利用相机拍摄液晶涂层所反射的空间光谱图像,结合标定结果可以获得涂层受到的表面剪切应力矢量分布。基于这样的理论,开展了液晶涂层光学摩阻测量技术研究,包括:液晶材料喷涂工艺研究,搭建相应的测量系统,液晶涂层标定方法研究,表面摩阻测量实验研究等。低速喷流实验定量测量了喷流-平板干扰区表面剪切应力矢量分布。Ma=5的高超声速风洞实验获得了尖前缘平板表面摩阻分布定量测量结果,以此判断了平板边界层的转捩。
Shear-sensitive liquid crystal coatings have optical properties that are sensitive to shear stress. The color development of liquid crystal coatings is not only related to the amount of stress, but also to the direction of stress. Under the vertical illumination of white light, the space spectral image reflected by the liquid crystal coating is photographed by the camera, and the surface shear stress vector distribution of the coating can be obtained by combining the calibration results. Based on this theory, the liquid crystal coating optical friction measurement technology research, including: liquid crystal material spraying technology research, set up the corresponding measurement system, liquid crystal coating calibration method, surface friction measurement experiment research. The low velocity jet experiment quantitatively measured the surface shear stress vector distribution in the jet-slab interference zone. Ma = 5 hypersonic wind tunnel experiments obtained tip front plate surface friction distribution quantitative measurement results, in order to determine the plate boundary layer transition.