Production of converging cylindrical shock waves by finite element conical contractions
Abstract
An annular shock tube in which a planar incident shock is turned 90 degrees by area contractions has been used to examine cylindrical converging shock waves. The results show that of the two-dimensional configurations evaluated, a planar three-element contraction provides the most stable shock in a narrow exit passage. Conical contraction rings have been successfully employed in an annular shock tube to generate symmetrical converging cylindrical shocks which experience a breakdown in symmetry at a small radius. It is suggested that shocks on the converging wave lead to vortex formation during subsequent shock expansion. Perturbed cylindrical shocks cannot achieve perfect implosion because of the formation of triple shock waves and vortices.
- Publication:
-
Shock Tube and Shock Wave Research
- Pub Date:
- 1978
- Bibcode:
- 1978stsw.proc..107W
- Keywords:
-
- Cylindrical Waves;
- Shock Tubes;
- Shock Wave Generators;
- Shock Wave Propagation;
- Convergence;
- Finite Element Method;
- Implosions;
- Mach Number;
- Vortices;
- Wave Amplification;
- Fluid Mechanics and Heat Transfer