风沙两相流测量技术研究进展

围绕风沙两相流的测量, 归纳了过去几十年来在风沙动力学研究中所使用的风速测量技术和输沙率测量装置.着重讨论了高频测量在目前风沙动力学研究中的必要性, 分析了传统风速和输沙率测量装置的优缺点.对新一代光学测量技术------PIV在风沙两相流测量中的应用进行了较为详细的探讨.指出PIV测速技术在风沙两相流研究中具有广泛的应用前景, 使用PIV测速技术可以得到风沙流结构、两相速度场等宏观信息, 同时也可以进行单个颗粒运动状态的研究. 

DEVELOPMENT OF WIND-SAND FLOW MEASUREMENT TECHNIQUES

To analyze the relations between the sand transport rate and the forcing wind,a high sampling frequency is necessary for the measurement of the wind velocity and the sand transport rate.This paper reviews the development of measurement techniques related to wind-sand flows in past several decades.Merits and demerits of conventional measurement devices for the wind velocity and the sand transport rate are discussed in detail.Moreover,the Particle Image Velocimetry (PIV),a new optical velocity measurement technique is specially addressed in this paper,which has great potential applications in the wind-sand flow experiment. Based on the PIV technique,not only the macro information such as two phase velocity field of wind and sand, wind sand flow integral structure,but also micro information such as single grain motion,can be obtained.