气液两相脉冲爆轰发动机的建模和仿真  

One-Dimension Euler-Lagrange Model and Simulation of Gas-Droplets Two Phase Detonation

作　　者：蒋弢[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：《计算机仿真》2012年第8期76-80,88,共6页Computer Simulation

基　　金：高等学校博士学科点专项科研基金资助项目(20093219110037);南京理工大学自主科研专项计划资助项目(2011XQTR05)

摘　　要：研究脉冲爆轰发动机喷射混合装置设计问题,针对两相爆轰流场中燃料液滴半径和数量实际上分布的不均匀性,为了建立更符合实际的模型,提出了气液两相爆轰的欧拉-拉格朗日模型,对气相采用CE/SE方法求解,液相采用四阶龙格库塔法求解。得到了液滴在爆轰管内的分布及对管内流场的影响。分析了填充速度和点火能量,不同液滴半径,单液滴粒径模型和Rosin-Rammler分布模型对燃烧转爆轰过程的影响。仿真结果表明,减小液滴半径,提高气液混合均匀程度和加快填充速度(点火能量足够大时)都可缩短点火起爆距离和时间,并为脉冲爆轰发动机提供了设计依据。For the radius of droplets indetonation fiield is non - uniform, an Euler - Lagrange model of gas - droplets two phase detonation was established, in which the gas and liquid equations were respectively calculated by CE/SE method and fourth - order Runge - Kutta method. The distribution of droplets and effects of the distribution were obtained. The effects of fill speed, ignition energy, droplets diameter, single droplet size model and Rosin - Rammler distribution model on DDT （Deflagration to Detonation Transition） were analysed. Numerical results show that decreasing the droplets diameter, increasing the fill speed when the ignition energy is strong enough, and well mixing the air - gasoline can all shorten the distance and time of DDT. The resulsts have an important refrenee value to design of pulse detonation engine.

关 键 词：脉冲爆轰发动机 欧拉-拉格朗日模型 时空守恒元与求解元方法 两相爆轰 燃烧转爆轰 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]