Domains and Boundaries of Pseudo-Stationary Oblique Shock-Wave Reflections.
TORONTO UNIV DOWNSVIEW (ONTARIO) INST FOR AEROSPACE STUDIES
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The reflection of oblique shock waves in air in pseudo-stationary flow was investigated analytically and numerically. The transition boundaries between the four types of shock-wave reflection regular RR, single Mach SMR, complex Mach CMR and double Mach DMR were established up to Ms 20 for both perfect and imperfect air in thermodynamic equilibrium rotation-vibration coupling, vibrational excitation, dissociation, electronic excitation and ionization. In addition, an analysis was made for perfect gases with differing gamma, in order to clarify the effects of the specific-heat ratio gamma, on the shock-wave configurations. It was verified that the reflected wave angle omega was a very sensitive function of gamma, and a decrease in gamma lowered the value of omega significantly and even shifted the value of omega towards negative values under certain conditions of Mach reflection. This phenomenon occurred in a perfect gas with gamma less than 1.4 and in imperfect air. However, it was absent in perfect air with gamma 1.4. An exmination of the perfect and imperfect air results shows no crossings of transition lines and removes the conjecture of possible triple-Mach reflection. The present analytical results were compared with the available experimental data for air and nitrogen for shock Mach numbers up to 10.
- Fluid Mechanics