CE/SE法模拟爆震波点火及传播过程

Numerical simulation of detonation ignition and propagation progress by CE/SE method

运用时空守恒元和解元(CE/SE)法模拟一维爆震波的形成及传播过程,分析产生爆震波的不同机理和DDT(爆燃-爆震转捩)过程的影响因素.采取激波点火和热点点火两种点火方式,分别对应SDT(激波-爆震转捩)和DDT过程,热点点火初始场采用线性温度分布和阶梯性温度分布,整个管道均为常压.用隐式梯形方法实现刚性源项积分.结果表明,SDT和DDT对应于不同的爆震波机理,并且DDT受点火区不同参数的影响,为研究爆震波点火和DDT过程提供了理论依据.

A space-time conservation element and solution element method （CE/SE） was used to simulate the formation and propagation process of one-dimensional detonation; also the detonation mechanism and influential factors to DDT （deflagration to detonation transition） were analyzed. Shock ignition method and hotspots ignition method, corresponding to SDT （shock to detonation transition） and DDT respectively, were employed. For the hotspot ignition, the initial pressure was 1 atm and temperature was linear or step-wise. Implicit trapezoidal technique was employed to handle stiff source term. Results show that the shock ignition and hotspot ignition are of different detonation mechanisms and DDT is affected by parameter variations in ignition zone. The results will offer reference to study of detonation ignition and DDT process.