Numerical Investigation on Effects of Ignition Energy on Two-phase Detonation Wave Formation

Mechanism of deflagration to detonation transition(DDT)of liquid octane/air mixture is studied by using theory of one-dimension reacting flow,particle-trajectory model and two-step reaction model,of which the numerical formulation is described on the S αγ,β scheme of gasdynamic step and a second-order accurate Adams method of chemical step in Lagrangian mass coordination system,based on which code-CPTD is developed.Basic properties of liquid-fueled detonation structure together with the effects of ignition energy and initial temperature of detonable mixtures on detonation structure and development are investigated in our current study.Based on the results obtained numerically,it's found that the increasing of both ignition energy and initial temperature of detonable mixtures in the tube will significantly enhance transition to detonation.Detonation intensity rises with ignition energy,but decreases as initial temperature increases.Our calculations show that the numerical results are in good agreement with experimental ones,which implies that a feasible numerical method has been provided here to simulate pulse detonation engine operation processes including DDT phenomena.