Nanoparticle-based planar laser scattering (NPLS) experiments and large eddy simulation (LES) were launched to get the fine\nstructure of the supersonic planar mixing layer with finite thickness in the present study. Different fromthe turbulent development\nof supersonic planar mixing layer with thin thickness, the development of supersonic planar mixing layer with finite thickness\nis rapidly. The large-scale structures of mixing layer that possess the characters of quick movement and slow changes transmit\nto downriver at invariable speed. The transverse results show that the mixing layer is strip of right and dim and possess 3D\ncharacteristics.Meanwhile the vortices roll up fromtwo sides to the center. Results indicate that the higher the pressure of the high\nspeed side is, the thicker the mixing layer is. The development of mixing layer is restrained when the pressure of lower speed side\nis higher.The momentum thickness goes higher with the increase of the clapboard thickness. Through increasing the temperature\nto change the compression can affect the development of the vortices. The present study can make a contribution to the mixing\nenhancement and provide initial data for the later investigations.
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