等离子体射流点火对燃烧转爆轰影响的二维数值计算  

Two-dimensional Numerical Calculation for the Influence of Plasma Jet Ignition on Deflagration-to-detonation Transition

作　　者：林玲[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,江苏南京210094

出　　处：《兵工学报》2014年第9期1428-1435,共8页Acta Armamentarii

基　　金：中央高校基本科研业务费专项(30920130112007);国家自然科学基金项目(11372141);高等学校博士学科点专项科研基金项目(20113219120045)

摘　　要：采用二维粘性CE/SE方法对等离子射流点火的多相爆轰进行了数值计算,分别以N-S方程和Euler方程为控制方程,对比了等离子体射流条件下粘性对爆轰流场的影响。分析了不同射流温度、时间及初始液滴半径对燃烧转爆轰过程的影响。计算结果表明:粘性作用对爆轰波的传播过程影响甚小,对爆轰参数数值大小有一定影响。提高初始射流点火的温度和时间,可以显著地缩短形成稳定爆轰的燃烧转爆轰距离(DDT);当等离子体射流已经充分点燃可爆混合物,继续增加射流时间对缩短DDT影响较小。当液滴半径小于50μm时,爆轰波峰值压力随着液滴半径的增加而增加;当液滴半径大于50μm时,爆轰波峰值压力随着液滴半径的增加而减小。计算结果对脉冲爆轰发动机(PDE)的设计与实验具有一定的指导作用。The multiphase detonation model of plasma jet ignition is calculated by the two-dimensional viscous CE/SE method. The influence of viscosity on the detonation flow field under the condition of the plasma jet is analyzed through N-S equation and Euler equation. The influences of different ignition temperatures and time of the jet and initial droplet radius on the process of deflagration-to-detonation transition （DDT） are analyzed. The calculated results show that the viscosity has a very small effect on the propagation of detonation wave, while has some effects on the detonation parameters. DDT distance can be significantly shortened by improving the initial jet ignition temperature and time. When the plasma jet has fully ignites explosive mixture, a continual increase in jet time has little effect on the decrease in the distance of DDT. When the droplet radius is less than 50 μm, the peak pressure of detonation wave increases with the increase in droplet radius. When the droplet radius is more than 50 μm, the peak pressure of detonation wave decreases with the increase in droplet radius.

关 键 词：兵器科学与技术 脉冲爆轰发动机 等离子体射流 多相爆轰 CE/SE方法 燃烧转爆轰 

分 类 号：TJ011.1[兵器科学与技术—兵器发射理论与技术]