Abstract
Oscillation of the circular pseudo shock in the radial and spiral supersonic flow between two parallel discs was investigated both numerically and experimentally. In the simulation, 2 nd-order accurate, Harten-Yee's upwind TVD scheme was used for high resolution and numerical stability, and Baldwin-Lomax's algebraic model was used as the turbulence model. To simulate shock wave oscillation, the back pressure was fluctuated at the outlet boundary. The X-type pseudo shock, which appears at higher Mach number, is more stable than the A type one, which appears at lower Mach number. Oscillation of mode 0 is predominant when the swirl is absent, while it becomes weaker and higher modes appear with the increase in the swirl.
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