Domains and Boundaries of Pseudo-Stationary Oblique Shock-Wave Reflections.

作者：J.-H. Lee, I. I. Glass · 年份：1982 · DOI：10.21236/ada127785 · 被引用次数：8 · 研究领域：Gas Dynamics and Kinetic Theory、Ionosphere and magnetosphere dynamics、Computational Fluid Dynamics and Aerodynamics

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.