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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。
In this paper, the design of pulse detonation engine injection mixing device is studied. In view of the non-uniform distribution of fuel droplet radius and number in two-phase detonation flow field, in order to establish a more realistic model, Eulerian-Lagrangian model, the CE / SE method is used to solve the gas phase and the fourth-order Runge -kutta method is used to solve the liquid phase. The distribution of droplets in the detonation tube and the influence on the flow field in the tube were obtained. The effects of filling velocity and ignition energy, different droplet radius, single droplet size model and Rosin-Rammler distribution model on combustion-to-detonation process were analyzed. The simulation results show that reducing the droplet radius, improving the gas-liquid mixing uniformity and accelerating the filling speed (when the ignition energy is large enough) can shorten the ignition initiation distance and time, and provide the design basis for the pulse detonation engine.