关键词: PIV技术, 风沙环境风洞, 风沙边界层, 沙粒速度, 沙粒浓度

Abstract: In order to test the accuracy of particle image velocimetry in wind tunnel and its application potential in blowing sand boundary layer research, seeding particles were selected as tracer and the wind velocity profile was re\|measured, the distribution law of sand particle velocity and concentration was also obtained. The results suggested that the wind velocity profile measured by PIV fits well with the standard wind profiler's result. The mean horizontal particle velocity changes with the height above the sand tray in power function, and the relative particle concentration changes with the height above the sand tray in exponential function. The mean horizontal particle velocity increases with the increase of the height and wind velocity, but the relative particle concentration decays with the height. The smaller the wind velocity the faster the relative particle concentration decays and vice versa. The results in this experiment agree well with those proposed in most previous studies, which reveal that PIV system assures the technical support on more accurate microcosmic research on aeolian sand movement in future.

Key words: PIV technology, blowing sand wind tunnel, blowing sand boundary layer, sand particle velocity, particle concentration