喷雾发动机性能分析

Parametric study on the performance of mist jet engine

为了分析喷雾发动机的推进性能,采用双流体模型,对喷管内雾状气液两相流场进行了数值模拟,并根据计算结果及运行环境参数,求得发动机推力及推进效率。重点研究了入口压力,气相、液相质量流率,喷管半收缩角,液滴直径,船速等参数对发动机推力及推进效率的影响。结果表明:推力随入口压力、气相质量流率的增大而增大,推进效率随其增大而减小;推力及推进效率均随着液相质量流率的增大而增大,随着喷管半收缩角及液滴直径的增大而减小;当船速逐渐增大时,推力逐渐减小,推进效率却逐渐增大。

To predict the performance of mist jet engine,the gas-droplet nozzle flows were calculated with two-fluid model.The thrust and propulsion efficiency were obtained using the calculation results and boundary conditions.The influence of initial pressure pi,gas mass flow rate m G,water mass flow rate m L,half nozzle converging angle θ,droplet diameter D and ship velocity us to the thrust and efficiency were investigated.Results indicate that the thrust increases with increasing initial pressure and gas mass flow rate,but the efficiency decreases.The thrust and efficiency increase with increasing water mass flow rate,decreasing droplet diameter and half nozzle converging angle.With increasing ship velocity,the thrust decreases,but the efficiency increases.The results are useful for further investigation on the mist jet propulsion system.