SHOCK WAVE BIFURCATIONS AND SELF-SUSTAINED-WAVES IN VIBRATIONALLY NONEQUILIBRIUM GAS

Abstract. The influence of vibrational nonequilibrium sustained by an external heat source on the shock wave structure is investigated. The gas with stationary nonequilibrium has the five fields of the nonequilibrium degree S with qualitatively different acoustical properties. Nonequilibrium leads to the strong modification of shock waves. The shock wave adiabat for a nonequilibrium gas with an exponential relaxation law is constructed. Unlike the frozen adiabat, this adiabat has two branches. Possible shock wave structures are described in S –D bifurcation diagram (D is the stationary wave speed). Weak shock waves are unstable. They disintegrate into sequence of the self-sustaining waves. Two types of the self-sustained waves (the pulse and the wave with non-zero asymptote) are obtained