ELECTRON DENSITY AND IONIZATION PHENOMENA IN SHOCK WAVES.
Annual summary rept.,
HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF PHYSICS
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A new shock-tube suitable for microwave and optical measurements was designed and manufactured. It was established that the Mach speed behind a taper section ending in an area change is close to that predicted by the steady state theory, provided measurements are made far enough downstreams, and provided viscous corrections are being made. However, near the transition section, large deviations from the values predicted either by the steady state or linear theory are found. Within 20-50 nozzle lengths there are fluctuations in the Mach speed which are only damped out far enough downstreams. For the inverse problem of a shock flow into an expanding constriction yielding a larger area, one also finds that the Mach speed far enough downstreams approximates the steady state theory. However, near the transition section the fluctuations are not as violent. The optical data show a peculiar intensity dependence on the position behind the shock front.
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics