Abstract: A Preliminary design study for separate turbofan-ramjet engine was conducted. Choices of engine configuration, selection of design parameters, including of bypass ratio, pressure ratio, temperature before turbine and type of fuel etc, and operat- ing mode of turbofan-ramjet engine were discussed.The calculation of examples indicates the effect of differnt design parameters on engine performance. In addition, the effect of use of common inlet on engine performance was analysed.

Key words: Turbofan engine;Ramjet engine;Compound engine;Aerospace plane;Design;Research

摘要： 本文对分离式涡扇-冲压发动机进行了初步设计研究,讨论了如何选择发动机结构外形,设计参数(包括旁路比、压力比、涡轮前温度和燃料种类)以及涡轮冲压发动机工作方式等。通过计算表示了不同设计参数对发动机性能的影响,还分析了普通进气道对发动机性能的影响。

关键词: 涡轮风扇发动机;冲压式喷气发动机;混合式发动机;航空航天飞机;设计;研究