Formation and Stability of Near Chapman-Jouguet Standing Oblique Detonation Waves

A numerical investigation of the behavior of standing oblique detonation waves (ODWs) near the Chapman-Jouguet (minimum entropy) point is the main purpose of this investigation. The laminar, two-dimensional Navier-Stokes equations coupled with a nonequilibrium hydrogen-air combustion model based on chemical kinetics are used to represent the physical system. The equations are solved with the window allocatable resolver for propulsion computational fluid dynamics code. A time-accurate simulation of the formation of a standing ODW near the Chapman-Jouguet condition yields a nonoscillatory, stable structure. The stability of the ODW to inhomogeneities in the oncoming fuel-air mixture is assessed through other time-accurate simulations by artificially introducing small disturbances consisting of pure air just upstream of the ODW structure.