压气机转子内部流场SPIV测量的精度分析

讨论了压气机转子内部流场测量结果的不确定度分析方法,分析了三维速度的直接测量结果、一阶统计量(涡量)和二阶统计量(雷诺应力)测量结果的收敛性,及其所能够达到的典型测量精度;最后分析了影响速度高阶统计量测量精度的主要因素,及提高其精度的可行技术途径.

Precision analysis of the flow field measured in compressor rotor by using stereoscopic particle image velocimetry

At present stereoscopic particle image velocimetry (SPIV) has been used more and more to study complex flows in compressors, and more attention has been paid on the measurement accuracy of it. This paper discussed the uncertainty analysis method of some SPIV results measured inside the compressor rotor. The convergence characteristics of the SPIV results of the three velocity components, the first-order results (vorticity) and the second-order statistics (the Reynolds stress) were investigated and the measurement accuracy was analyzed. Then the analyses of the main factors influencing the measurement accuracy of high-order statistics were carried out. At last, some advices for improving the measurement accuracy of SPIV in turbomachinery were given.