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根据大空间自然对流水平圆管上部上升的羽状烟柱区不符合边界层假设而导致各种解之间差异的问题,提出了利用横向大剪切量干涉实验装置来实现温度场的光学测量,得到了自然对流水平圆管在不同壁温时的实时条纹。利用彩色条纹图像中RGB原始数据中的R分量的峰、谷极值点的坐标来识别明、暗条纹并得到了全场的级数分布,以此反演出全场温度分布。实验结果表明:当圆管直径d为15.6mm、剪切量s为24.2mm时,实验得到的干涉条纹类似于利用全息干涉或马赫-曾得干涉原理得到的无限宽简单条纹;干涉条纹分辨率达到75.64pix/mm;利用横向大剪切量干涉法能够准确快速地反演全场温度分布,为工程热物理分析提供相关数据。
According to the problem that the feather-like smoke column area in the upper part of the circular tube with large space natural convection does not accord with the assumption of the boundary layer, the optical measurement of the temperature field is put forward by using the experimental apparatus of transverse large shear interference, The real-time streaks of natural convection tubes at different wall temperatures are obtained. The bright and dark fringes are identified by using the coordinates of the peak and valley points of the R component in the RGB original data in the color fringe image, and the series distribution of the whole field is obtained, so as to obtain the global temperature distribution. The experimental results show that the interference fringes obtained when the diameter d is 15.6mm and the shear amount s is 24.2mm are similar to those of the infinite width simple fringes obtained by the holographic interference or the Mach-Zehnder interferometry principle. The interference fringe resolution Up to 75.64pix / mm. Using the method of transverse large shear interferometry, the full-field temperature distribution can be accurately and quickly retrieved, providing relevant data for engineering thermophysical analysis.