变循环压缩系统单外涵模式外涵节流特性分析

In order to clarify the matching flow mechanism among the fan, the core drive fan stage (CDFS) and the high-pressure compressor in the compression system of a certain double bypass variable-cycle engine, the fluid mechanics software Numeca was used to obtain the external throttling characteristics in the single bypass mode under three typical back-pressure situations of internal bypass. The results show that the throttling of the external duct can achieve a substantial adjustment of the bypass ratio, and it can realize a substantial adjustment of the pressure ratio of the external duct and the adiabatic efficiency of double ducts by influencing the working status of the fan and CDFS.