Focusing of Converging Cylindrical Shock Wave.

Abstract

In order to study the stability of converging cylindrical shock waves an annular vertical diaphragmless shock tube was designed and constructed. This shock tube has a self-sustained structure and produces cylindrical shock waves with a wide range of shock Mach numbers and a higher degree of repeatability. Double exposure holographic interferometry method was used for quantitative flow visualization. It is found that the cylindrical shock waves converge more uniformly in this vertical strut-free shock tube than in a former horizontal annular shock tube and behavior of the converging cylindrical shock waves is clarified.