Hypervelocity flow in axisymmetric nozzles

A simple procedure for the design of axisymmetric supersonic nozzles for use in reflected-mode shock tunnels is described. This method has been used to design a moderate Mach number (M = 4) nozzle and a high Mach number (M = 10) nozzle. Both nozzles have been calibrated by measuring the pitot profiles near the nozzle exit planes and, although the M = 4 nozzle performs well, the M = 10 appears to have reached a Mach number - pressure limit in which the unsteady nozzle boundary layers significantly affect the test flow.