基于气液两相流解析模型的水冲压发动机推进特性分析

给出了喷管中气液两相流动等温正压模型的解析解。基于该解析模型以及水冲压发动机内流道几何参数,迭代求解了发动机在一系列工况下的推进特性。研究表明,水冲压发动机的推力、效率、比冲随着气相质量流量以及航速的共同提高而提高,单单增加航速或单单增加气体质量流率,都会使得比冲和效率先增后减。单单增加气体质量流率,水流流量减小,推力增加,但是耗气量显著增加。单单增加航速,水的流量增加,推力将先增后减。

Performance investigation on the bubbly water ramjet based on an analytical model for the air-water multiphase flow

An analytical solution is given for the isothermal air-water flow in nozzles. With the geometri-cal parameters of a water ramjet, the propulsion performance of the ramjet is iteratively calculated and an-alyzed based on the analytical model. The propulsion force, specific impulse and efficiency are found to be augmented when the flow rate of air and cruising speed of the ramjet increase together. The propulsion ef-ficiency and specific impulse would increase at first but decrease later when only air flow rate or the cruis-ing speed augments. The propulsion force is found to be increased if only the mass flow rate of the air aug-ments, but the water mass flow rate is reduced subsequently and the consumption of the air considerably in-creases. The propulsion force increases at first but decreases later when only the cruising speed augments, causing the mass flow rate of water keeps increasing.