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Study on the Interaction between Low-Mach-Number Grid Turbulence and Spherical Shock Wave

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Characteristics of low-Mach-number grid turbulence interacted with a spherical shock wave are investigated by means of laboratory experiments using a wind tunnel and a diaphragm-less shock tube. Turbulence-generating grids are installed at the entrance to the test section of the wind tunnel to generate nearly isotropic turbulence. A shock wave propagates spherically from the open end. A shock wave was generated by the diaphragm-less shock tube using a quick piston valve, and was emitted from the open end of the shock tube, which was directed vertically downward across the turbulent flow. A shock wave propagates spherically from the open end. The shock wave generator could be driven automatically with good repeatability. Instantaneous streamwise velocity before and after passing a shock wave is measured by hot wire anemometry. The probe is set up in the upstream of the open end of the shock tube. The results show that streamwise turbulent intensity is increased and the streamwise integral length scale is decreased after interaction with a shock wave.

Author(s):

Takuya Kitamura    
Nagoya University
Japan

Kouji Nagata    
Nagoya University
Japan

Yasuhiko Sakai    
Nagoya University
Japan

Akihiro Sasoh    
Nagoya University
Japan

Osamu Terashima    
Nagoya University
Japan