The underwater closed-loop propulsion system is characterized by high energy densityhigh specific power and zero emission, which make it superior in terms of range, speed, depth and stealth. In this paper, the dynamic model of the underwater closed-loop propulsion system is developed. The combustor model is based on the interphase coupling of fuel gas and coolant water. The turbine model takes rotator and volume inertia into account. The condenser model is divided into three zones: superheated, saturated and supercooled region. Using the model, the dynamic behavior of the system is simu-lated. The results indicate that as long as the ratio of fuel gas to coolant water keep constant during the dynamic process, the combustor temperature will remain stable. As such, the combustor pressure and turbine power output is determined solely by total flux of the work fluid. This conclusion implies the decouple control strategy for the system.%水下闭式循环动力系统具有高比能量、大比功率以及无工质排放的优点,能够大幅提高水下航行器航速、航程、航深和隐蔽性.本文首次针对某新型水下闭式循环动力系统建立其动态模型,其中燃烧室模型考虑气相氢、氧气和液相冷却水的相互耦合作用,汽轮机模型考虑其转子惯性和容积惯性,冷凝器模型考虑3个相区:过热区、饱和区和过冷区.利用该模型对系统动态过程进行仿真分析,结果表明只要氢、氧气和冷却水流量在系统动态过程中保持一定的比例关系,则燃烧室温度基本保持不变,而燃烧室压力和汽轮机输出功率仅取决于总工质流量.该结论为制定系统解耦控制策略奠定了基础.
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