气液两相脉冲爆轰发动机的建模和仿真

摘要

For the radius of droplets indetonation frield 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 refrence value to design of pulse detonation engine.%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.