This paper describes numerically the rapid deflagration-to-detonation transition (DDT) in detail a high-frequency pulse detonation rocket engine. Different from traditional DDT, reactants are injected into chamber near open end and travel toward closed end. Previous experiments have implied that gasdynamic shock by injecting confined space intensive turbulence generated high-speed jet play impo...

We study the existence of profiles for Chapman-Jouguet detonation and deflagration waves in the Navier-Stokes equations for a reacting gas. In the limit of small viscosity, heat conductivity, and diffusion, the profiles correspond to heteroclinic orbits of a system of singularly perturbed ordinary differential equations. The burned end state of the waves, however, is a nonhyperbolic equilibrium...

The mechanism for deflagration-detonation-transition (DDT) by turbulent preconditioning, suggested to explain the possible occurrence of delayed detonations in Type Ia supernova explosions, is argued to be conceptually inconsistent. It relies crucially on diffusive heat losses of the burned material on macroscopic scales. Regardless of the amplitude of turbulent velocity fluctuations, the typic...

A hydromagnetic Rankine-Hugoniot model for propellant acceleration in gas-fed pulsed plasma thrusters is presented and verified against available experimental data. Building on early work by Cheng et al [Nuclear Fusion 10, pp. 305-317, 1970], the snowplow mode is compared to a detonation process and it is shown here that a competing “second” mode, which was observed independently in gas-fed pul...

We present full-star simulations of Type Ia supernova explosions on the basis of the standard Chandrasekhar-mass deflagration model. Most simulations so far considered only one spatial octant and assumed mirror symmetry to the other octants. Two full-star models are evolved to homologous expansion and compared with previous single-octant simulations. Therefrom we analyze the effect of abolishin...