On deviations from ideal Chapman-Jouguet detonation velocity

摘要: Experimental data shows that under certain conditions, measured detonation velocities exhibit deviations from theoretical values computed according to the Chapman-Jouguet (CJ) model. The purpose of this paper is investigate why in some circumstances such occur. A Zeldovitch-von Neuman-Doring model (ZND) taking into account specific chemical kinetics mixture enables us identify a critical parameter: effective reaction length. This parameter mainly related composition reactive mixture. It shown ratio dimension tube where velocity measurements are carried out can explain ideal values. simple has been applied series existing experimental characterized by deviations. Different initial namely, (1) mixtures near limits, (2) low pressures, and (3) containing halogenated hydrocarbons, investigated. All show deficit, ΔDcj, an incrasing, but not necessarily linear, function length/dimension tube, drea/dtube. To support statement, detailed one-dimensional numerical computation performed, both nonstationary hydrodynamics kinetics. These computations end up with wave traveling at velocity. suggests deviation CJ ought be explained parameters relative size surrounding wave; drea/dtube parameter.