Numerical Analysis of Shock Wave Reflections in Carbondioxide

When a plane moving shock wave encounters a sharp compressive corner in a shock tube, regular reflection or Mach reflection occurs, depending upon the Mach number of the incident shock wave, the corner wedge angle, and the initial thermodynamic state of the gas. These reflections have been investigated theoretically and experimentally by many researchers. Unfortunatedly, however, most of these investigations were done on diatomic gases such as air, oxygen and nitrogen. In the present paper, numerical computation is made for obtaining the quantities of carbondioxide behind incident shock wave as well as the reflected shock wave from an inclined wall. It is assumed that the vibrational temperature of molecules is in equilibrium with the translational temperature, and some dissociation occurs is instantaneously behind the shock waves. The analytical results taking into account these real gas effects are compared with those in the case of perfect gas