A technique for real-time visualization of flow structure in high-speed flows

摘要: A newly developed MHz rate imaging system that provides real-time flow visualization is described. The technique utilizes a custom-built Nd:YAG pulse burst laser and an ultra high-speed digital camera capable of capturing 17 images over 150 microseconds. was used to visualize Mach 1.3 (M c =0.6) axisymmetric jet. Sample results indicate the potential provide detailed information on dynamic characteristics large-scale structures. two-dimensional cross-correlation calculate convective velocity Present generally agree with findings earlier investigations significant deviation from theoretical predictions.