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利用数值模拟的方法对粒子图像测速仪的精度问题进行了数值实验。速度场是通过对一个片光源上两次曝光的图像进行互相关处理来得到的。为了研究流体运动的不均匀性对于一个诊断区内速度矢量测量结果的影响 ,针对五种典型的不均匀性进行讨论。数值实验的结果表明有几种流体运动不均匀性会显著地影响这种粒子图像测速方法的精度
Numerical experiments were carried out on the accuracy of particle image velocimetry using numerical simulation. The velocity field is obtained by crosscorrelating the two exposed images on a slice of the light source. In order to study the effect of inhomogeneity of fluid motion on velocity vector measurements in a diagnostic zone, five typical inhomogeneities are discussed. Numerical experiments show that there are several fluid inhomogeneities that can significantly affect the accuracy of the particle image velocimetry