Formation of a reverse flow behind the Mach disk at various Reynolds numbers
摘要
The existence of a reverse flow behind the Mach disk in the first shock cell of a supersonic underexpanded jet is numerically studied by solving the Navier–Stokes equations. It is shown that the reverse flow existence depends on the Reynolds number: it emerges at low Reynolds numbers and vanishes when the Reynolds number exceeds a certain value. Thus, for experimental observations of this paradoxical phenomenon, it is necessary to perform experiments with sufficiently rarefied gaseous jets.