低温等离子体放电区长度对点火起爆的影响

为了研究低温等离子体放电区长度,即放电区间隙不变,体积大小对脉冲爆震发动机点火起爆的影响,以丙烷为燃料,空气和纯氧为氧化剂,充分考虑其详细的化学反应动力学机理,将低温等离子体放电区等效为高温高压火核,对放电区长度为20,40,60mm三种结构,利用Fluent软件,对点火起爆过程进行数值模拟,并进行对比分析.结果表明:将低温等离子体放电区等效为高温高压火核是可行的,能够得到完整的点火起爆过程;不同放电区长度,对初始火焰形成、火焰传播速度和缓燃转爆震(DDT)时间有很大影响,对爆震波峰值压力影响不大. 

Influence of low temperature plasma discharge zone length on ignition initiating

For the fixed length of low temperature plasma discharge zone with the same discharge zone gap, the volume size''s influences on pulse detonation engine ignition initiating were studied. Propane was taken as fuel, air and pure oxygen as oxidant. The chemical reaction kinetics mechanism was fully considered in detail, and the low temperature plasma discharge zones were equivalent to high temperature and high pressure fire nucleus. Numerical simulations of the ignition initiating process were carried out by Fluent software. The lengths of the discharge zone of 20, 40, 60mm was comparatively analyzed. Results show that the low temperature plasma discharge zone equivalent to high temperature and high pressure fire nucleus is feasible, and complete ignition initiating process can be got; different lengths of discharge zone have strong influences on the initial flame form, the flame propagation speed and deflagration to detonation transition (DDT) time, but little influence on the detonation wave peak pressure.