Optical Observation of a Supersonic Jet from a Small Nozzle

Abstract

Supersonic axisymmetric jets from various kinds of small nozzles with a throat diameter of a few millimeters and an exit Mach number of 1.0-5.9 are optically observed. The jet from a tapered divergent nozzle has a cell structure even in a correct-expanded case. The over all pressure ratio for a correctexpanded jet and the cell structures of jets are discussed in detail.