关键词: 喷雾发动机;水下航行;非设计工况;数值模拟 

Abstract: To predict the off-design performance of mist jet engine, the mathematical models were constructed under some assumptions. The thrust and propulsion efficiency were obtained by numerical simulation. The effects of ship velocity and ambient pressure on the performance were emphatically investigated for a comprehensive understanding of mist jet engine. When the ship velocity is higher than the design value,the gas mass flow rate must be increased. In this condition, the engine works with higher efficiency and less thrust. With increasing ambient pressure,less gas needs to be injected, but the thrust and propulsion efficiency of the engine decrease. By means of regulating the gas mass flow rate and initial pressure with feedback, it can drive the engine output the thrust close to the drag of the vehicle with varied velocity. 

Key words: Mist jet engine; Underwater movement; Off-design points; Numerical simulation