超音通流风扇推进系统内流若干特征

CHARACTERISTICS OF INTERNAL FLOW PERFORMANCE OF AN STF FAN PROPULSION SYSTEM

探讨了一种非常规结构的推进系统—超音通流风扇推进系统的总体性能的特征。得到：（１）其必为变涵道比循环系统，由可变几何内、外涵通道提供对涵道比的主动控制；（２）一般的变涵道比循环推进系统超音速飞行时可获较常规系统更高的风扇增压比或风扇功率；（３）该推进系统高空单位流量推力与高度无关。简介了有关算例以说明诸点。

The total characteristics of a Supersonic Through Flow (STF) fan propulsion system of unconventional configuration have been studied.Therefrom some conclusions are obtained as:1.The system's bypass ratio must be actively controlled by adjusting both core and bypass engine's through flow areas.2.A general propulsion system with a bypass ratio variable cycle is able to hold a higher fan compression ratio or a stronger fan power in supersonic flight,when it is coupled with a variable core nozzle critical section area.3.For this new concept propulsion system,the specific thrust per unit of the total air mass flow does not vary with altitude up to the stratosphere.Some calculational results are presented briefly to support the above mentioned conclusions.