急拡大部をもつ管内の高速流れ

抄録

It is well known that self-excited flow cscillation can occur in a duct downstream of a sudden area change when the line pressure is high enough to produce transonic or supersonic flow. The mechanism of the flow oscillation has not yet been well established. The experiment was carried out using the duct of rectangular cross section to visualize the flow pattern. The numerical method was also used to simulate the steady flow pattern in the duct. The flow pattern during the oscillation, as well as the steady flow pattern, is obtained by Mach-Zehnder interferometry, shadowphotography, and the numerical technique.