Abstract
This paper describes an experimental study on the supersonic internal flows with Pseudo-Shock Waves (PSW) in a straight square duct with cross section of 80×80mm^2, using the pressure-vacuum type Mach 2 and Mach 4 supersonic wind tunnel of Muroran Institute of Technology. The formation process and characteristics of the Mach 2 and Mach 4 PSW were investigated by high speed digital camera observation and duct wall pressure fluctuation measurements. The free stream Mach number and unit Reynolds number just upstream of the PSW were M_∞=1.96, Re_∞=2.43×10^7m^<-1> and M_∞=3.98, Re_∞=2.22×10^7m^<-1>.
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