A passive control on shock oscillations in a supersonic diffuser

Title & Authors
A passive control on shock oscillations in a supersonic diffuser
Kim, Hui-Dong; Matsuo, Kazuyasu;

Abstract
Shock wave/boundary layer interaction frequently causes the shock wave to oscillate violently and thus the global flow field to unstabilize. In order to stabilize the shock wave system in the diffuser of a supersonic wind tunnel, the present study attempted to control the shock oscillations by using a passive control. A porous wall with the porosity of 19.6% was mounted on a shallow cavity. Experiment was made by means of schlieren optical observation and wall pressure measurements. The flow Mach number just upstream the shock system and Reynolds number based on the turbulent boundary layer thickness were 2.1 and 1.8 * 10$\small{\^}$6/, respectively. The results show that the present passive control method on the shock wave/boundary layer interaction in the supersonic diffuser can significantly suppress the oscillations of shock system, especially when the shock system locates at the porous wall.
Keywords
Compressible Flow;Boundary Layer;Interaction;Oscillation;Pseudo Shock Wave;Supersonic Diffuser;Supersonic Wind Tunnel;
Language
Korean
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