Experimental Study of the Starting Process in a Reflection Nozzle

Abstract

The unsteady events occurring during the time after the shock enters the nozzle of a shock tunnel and until a steady flow is established have been investigated for a two-dimensional reflection nozzle by multiple shadowgraphs and interferograms. The influences of different parameters (nozzle half-angle, throat width, and nozzle inlet radius) on the starting process are presented on x-t diagrams for the incident shock Mach number MS = 3. The density along the nozzle axis is presented at several times during the starting process.