Holographic interferometric investigation of the stability of converging cylindrical shock waves
Abstract
An experimental investigation has been carried out of the propagation and stability of converging cylindrical shock waves produced with an annular shock tube in which a planar incident shock wave is turned 90 deg through an area contraction. Double exposure holographic interferometry and a streak camera technique were used for flow visualization at shock Mach numbers of 1.10-2.10, in air, at 10-100 KPa. It can be seen from the quantitative isopycnics evaluated from the infinite fringe interferograms that the converging cylindrical shock wave is always unstable even for weak shock waves of Mach number 1.10 and a shock front instability of mode m = 4 exists near the center of the convergence which tends to be more significant for stronger shock waves.
- Publication:
-
IN: International Symposium on Physical and Numerical Flow Visualization
- Pub Date:
- 1985
- Bibcode:
- 1985pnfv.symp...59T
- Keywords:
-
- Cylindrical Waves;
- Flow Distribution;
- Flow Stability;
- Holographic Interferometry;
- Shock Wave Propagation;
- Convergence;
- Mach Number;
- Shock Fronts;
- Shock Tubes;
- Streak Cameras;
- Instrumentation and Photography