An experiment on choking phenomena in supersonic Fanno flows

Abstract

An experimental study was performed on the choking due to the friction in supersonic Fanno flows in long constant-area ducts. The results show that the choking condition of the flow is much different from the calculated value by the previous one-dimensional theory. For a given inlet Mach number and a friction coefficient of a duct, for example, the maximum possible length of the duct is shorter than that predicted by the theory. The reason has been well explained by replacing a normal shock wave assumed in the theory by a pseudo-shock wave in real flow.