Abstract:
Nano-tracer-based Planar Laser Scattering (NPLS) is a flow visualization technique developed by the authors. The NPLS technique is characterized with high spatial-temporal resolution and high signal-to-noise ratio under supersonic conditions. Flow visualization researches on complex flow phenomena such as the supersonic mixing layer, the supersonic flat boundary layer, the supersonic flow over compression-corner and the shock wave/boundary layer interaction have been carried out based on the NPLS. In recent years, the NPLS has been further applied to hypersonic boundary layer transition research. This paper mainly introduces the application of the NPLS technique in the visualization of boundary layer in the nozzle of hypersonic quiet wind tunnel, hypersonic conical boundary layer transition and delta wing boundary layer transition. The NPLS results under hypersonic conditions are in good agreement with the results obtained by high frequency sensors and temperature sensitive paint. This agreement indicates that the NPLS technique has a good application prospect in hypersonic boundary layer transition research.