高 超 声 速 强 预 冷 发 动 机 热 力 循 环 研 究 进 展

Advanced propulsion systems serve as the fundamental support for the horizontal takeoff and landing reusable hypersonic vehicles，amongst which hypersonic precooled engines have garnered significant attention in recent years due to its high potential. Therefore，it is crucial to conduct an in-depth investigation into the thermodynamic cycle of precooled engines and acquire a deep understanding of its working characteristics. This paper provides a comprehensive review of the domestic and overseas progress in the thermodynamic cycle of hypersonic precooled engines. The review encompasses various aspects，such as the modeling and analysis methods employed for engine thermodynamic cycle，the performance analysis methods，and the typical thermodynamic cycle schemes of precooled engines. Specifically，the open-loop direct precooled cycle and the closed-loop indirect precooled thermodynamic cycle with intermediate medium are introduced due to their marked differences. The research shows that for open-looped direct precooled cycle，fuel type is fundamental in determining its performance，and improving the heat sink of fuel is an important way to improve engine performance. As for closed-loop indirect precooled thermodynamic cycle with intermediate medium，there are some contradictions between the engine performance（specific impulse，specific thrust，etc.）and the complexity of closed cycle. Overall，it is necessary to continue the study on the key components of hypersonic precooled engines，refine more accurate component performance models，and improve component size，weight and other estimation models，in order to achieve accurate evaluation of engine specific impulse，specific thrust，thrust-to-weight ratio and other overall performance parameters，and then support the highly feasible thermodynamic scheme design of hypersonic precooled engines.