双反射技术对自由射流三维速度场的测量及显示

应用摄影测量和图像处理技术对自由射流的三维速度场进行了ＰＩＶ测量。构造了一种全新的双反射测量技术，使得二维测量中的多点同步和空间定位得到解决和提高。在精确计算了水与空气的折射关系之后，两幅像片间的同名点寻找更加可靠。重建和再现了ＰＩＶ中射流的连续三维瞬态粒子分布场和速度矢量场。

THREE-DIMENSIONAL MEASURING AND VISULIZATION OF AFREE JET BY MEANS OF TWO-RELECTION

Three-dimensional PIV of a free jet is given by means of the photogrammetryand image prcessing. In this paper,a new double-reflection method is being used to solve theproblems of synchronism and precision in the three-dimensional measuring of a high speedjet. The indices of refraction in water and air are considered,so the calculation of particle’s3-D position is correct. A succession of 3-D, global, instantaneous fields of particles andtheir velocity vectors have been reconstriicted by means of microcomput...