Abstract: A Preliminary study on the combined jet engines suitable for earth/orbit space transportation is made in this paper.Some evaluation of performance, size and weight of the engine is carried out and the transportation capadility of the space plane which will be powered this type of engines is also estimated.

Key words: Space propulsion;Turbofan engine;Ramjet engine;Compound engines

摘要： 本文初步探讨了用作天地往返运输系统推进装置的组合发动机,估算了其性能、尺寸、重量以及使用这些发动机时的运载能力。

关键词: 航天推进;涡轮风扇发动机;冲压式喷气发动机;混合式发动机