等离子体点火对燃烧转爆轰影响的数值计算  

Numerical Calculation of Effect of Plasma Ignition on DDT

作　　者：彭振[1] 翁春生[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094

出　　处：《燃烧科学与技术》2011年第1期84-89,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(10672080)

摘　　要：采用CE/SE方法对耦合的流体力学方程与麦克斯韦方程求解,对等离子体点火和气液两相爆轰过程进行数值模拟.讨论了3种不同点火位置对燃烧转爆轰(DDT)的影响.结果表明,等离子体点火可以在短时间内点燃爆轰管内汽油/空气混合物,经过一系列复杂的波系与波系、波系与管壁之间的相互作用最终形成稳定的爆轰波.壁面点火比中心点火具有优势,可以缩短DDT时间约8.5%,缩短DDT距离约10.6%,部分计算结果与试验结果符合良好.研究工作能够为PDE的优化设计提供理论指导.Numerical simulations of plasma ignition and two-phase gas-droplet detonation are carried out. Coupling fluid mechanics equations and Maxwell equations are solved by CE/SE method. The influences of 3 different ignition methods on deflagration to detonation transition （DDT） are analyzed and discussed. The results show that plasma ignition can ignite the gasoline-air liquid mixture in a short time, and steady detonation finally forms after a series of interaction between complex waves and the tube walls. Radial ignition of tube wall can achieve better results than central ignition of axial, with DDT time reduced by about 8.5% and DDT distance shortened by near 10.6%. Past of calculation results are in good agreement with experimental ones. The research casts some light on the improvement of the PDE design.

关 键 词：等离子体点火 脉冲爆轰发动机 两相 爆轰波 CE/SE方法 

分 类 号：V233.3[航空宇航科学与技术—航空宇航推进理论与工程]