LOCATIONS AND OSCILLATION PHENOMENA OF PSEUDO-SHOCK WAVES IN A STRAIGHT RECTANGULAR DUCT.

Abstract

The effect of the location of pseudo-shock waves on the oscillations of pseudo-shock waves in a straight rectangular duct when the flows are choked at the duct exit has been experimentally investigated using high-speed schlieren photography and wall pressure fluctuation measurements at five measuring points along a duct. The highspeed schlieren films of the pseudo-shock wave oscillations and the wall pressure fluctuations in the pseudo-shock waves were statistically analyzed using a micro computer. The characteristics of the pseudo-shock wave oscillations and the wall pressure fluctuations in the pseudo-shock waves are shown, and the mechanism of pseudo-shock wave oscillations is also discussed.