Experimental Study of the Starting Process in a Reflection Nozzle

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.