Density fluctuations near a blunted body streamlined by a supersonic turbulent flow were experimentally investigated by the laser schlieren-technique. The turbulence was generated by a grid placed in the low-pressure chamber of a shock tube (with cell size of $2\times2$ mm). The test gas was air. The Mach number values of the incident shock wave were 2.2-3.4 and the initial pressure was 3-30 torr. The density-fluctuation structure function and correlation coefficient and also the turbulence scale were determined.
Department of Quantum Statistics and Field Theory, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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