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针对采用二次进水机制的水冲压发动机,基于特殊的工作方式初步建立了相应的热力循环模型,进而在不同的发动机工况下分析了循环热效率性能。选定水反应金属燃料基础配方为Mg/AP/HTPB的混合物,在不同组分配方条件下,相应发动机热力循环效率随各影响参数的变化规律一致,均随燃烧室压强和水反应金属燃料中金属含量的增加而呈增加趋势,相反,水燃比的增加会引起热效率的降低。特别地,给定一合理水燃比3.0,保持燃烧室压强和航行器航深分别为2.5 MPa和10 m,50%和60%镁含量的水反应金属燃料对应发动机的循环热效率分别为37.78%和44.38%,初步验证了基于联合循环的水冲压发动机良好的循环性能。
Aiming at the water-ramjet engine with secondary water inlet mechanism, a corresponding thermodynamic cycle model is established based on special working mode, and the cycle thermal efficiency performance is analyzed under different engine operating conditions. Under the condition of different components and formulas, the thermodynamic cycle efficiency of the corresponding engine is consistent with the changing law of all influencing parameters, both of which are related to the pressure of the combustion chamber and the content of water in the reaction of metal fuel Metal content increases with an increasing trend, on the contrary, the increase in water-fuel ratio will cause thermal efficiency decreased. In particular, given a reasonable water-to-oil ratio of 3.0, the thermal cycle efficiencies of the corresponding water-reacting metal-based fuels corresponding to 2.5 MPa and 10 m, 50% and 60% respectively of the combustion chamber pressure were 37.78% and 44.38%, preliminary verified the good cycle performance of the water-ramjet engine based on combined cycle.