摘要：分析介绍了激光多普勒流动测量技术的原理和用LDV／PDPA同时测定颗粒流体两相速度和粒径大小的基本方法，并进一步讨论了用LDV／PDPA测量颗粒浓度和两相流动动态特性的问题。

关键词：激光多普勒技术；颗粒流体；两相流动；动态特性

Abstract：This paper describes and evaluates the techniques for simultaneous measrements

of velocities, particle size and concentration in two- phase flows by means of a Laser Doppler Velocimetry(LDV)of a Phase - Doppler Particle Analyzer(PDPA).The time series measurementsof the particle size and velocity by a PDPA are also presented in order to analyze the local dynamictwo- phase flow structrue.

Keywords：laser - Doppler measuremnent technology ; particle flow ; two - phase flows; dy-namic structure