Study on Overall Performance Design of Hypersonic Precooled Combined Cycle Engine with Paralleled Heat Release and Compression System

摘要

Propulsion system is one of the most important issues of high speed transportation, and hypersonic precooled combined cycle engine (HPCCE) is a potential plan. It utilizes the thermal energy of high speed air flow through precooling process and transfers it into the power for driving the air compression, which, improves performance and avoids some thermal protection problems under high speed condition. However, with ordinary flow path design, over-high fuel consumption and pressure ratio shadows its advantages. Paralleled heat release and compression system, with several separated channels, is proved to be a solution. The system is analyzed through theoretical discussion and quantitative study, where operation mechanism, parameters design, feasibility and installing effects are studied. A simulation model is built to analyze the performance of paralleled system, and the equivalent component method is proposed for measuring its effect on the overall performance of the engine. The paralleled systems can sharply improve the engine performance in fuel consumption and simplify the compressor design. Inside the system, higher compression efficiency, more branches and higher heat transfer capacity enhance the performance benefits, but the feasible region and size limitations of the system cannot be ignored either. Besides, key technologies and further study goals are summarized.