LDV/PIV全场速度测量的误差分析

Error Analysis of the Whole Field Velocity Measurement Results via LDV/PIV

针对激光多普勒测速和激光粒子图像速度场测量的实验结果误差 ,提出了一种基于不可压缩流连续性的全场综合误差分析方法 .通过对轴对称旋转流动全场实验测量结果的误差分析发现 ,其实际全场测速综合误差虽然都小于 4% 。

The main objective of this paper is an error analysis of the whole field velocity measurement results by means of Laser Doppler Velocimetry (LDV) and Particle Image Velocimetry (PIV). As non invasive optics methods with advantages of high measurement precision and easy operation, these two measurement techniques are now popular in experimental fluid mechanics. The knowledge of the total measurement errors is especially important for the conplicated flow problems. The common analysis methods of the system errors were presented. To obtain the total errors, a new velocity field analysis method based on the continuum feature of incompressible flow was introduced. Experimental results of the axisymmetric rotating flow were analyzed. It is found that the total error source is less than 4% for the both techniques, but much higher than the system errors provided by the manufacturers.