ON THE INTERFERENCE OF A WEAK AND A STRONG SHOCK-WAVE IN A DISSOCIATING NITROGEN FLOW

The influence of the nitrogen dissociation on the interactions due to the interference of two planar shock waves in a hypersonic high enthal py flow is theoretically investigated for infinite reaction rates. The two limiting cases ofinfinitely slow and infinitely fast reactions ar e modelled as a perfect gas and an ideal dissociating gas in chemical equilibrium. To investigate the influence of finite reaction rates on the interactions of shock waves, experiments are performed in the ''hi gh enthalpy shock tunnel Gottingen'' (HEG) with a wind tunnel model co nsisting of a wedge type shock generator and a transversally mounted c ylinder. The pressure and heat transfer loads resulting from the shock wave interferences are measured and the flow field is visualized by m eans of interferograms. The experimental results are compared with the results of a numerical simulation for a dissociating nitrogen flow an d with the experimental results for a perfect gas flow.