基于NPLS技术,在超声速静风洞中对超声速半球绕流流场进行了实验研究,观察到了三维弓形激波及其与边界层相互作用所诱导的转捩/分离区,再现了超声速半球绕流流场的复杂结构.根据所得NPLS图像的时间相关性,分析了绕流流场结构的时空演化特征,得到了大尺度涡结构在流向和展向的运动特征,并且观察到了明显的周期性和相似的几何结构特征. Based on the NPLS technique, the flow field of the supersonic hemisphere was experimentally studied in a supersonic static tunnel, and the three-dimensional arcuate shock wave and the transition / dissociation region induced by the interaction with the boundary layer were observed. The supersonic hemispherical flow was reconstructed Based on the temporal correlation of the NPLS images obtained, the temporal and spatial evolution of the flow field structure is analyzed, and the characteristics of the large-scale vortex structure in the flow direction and the span direction are obtained, and the obvious periodicity and similarity are observed The geometric structure features.