超音通流风扇发动机循环分析

CYCLE ANALYSIS FOR A SUPERSONIC THROUGH FLOW FAN ENGINE

关键词:  涡轮风扇发动机  超音速流  性能分析

Key words:  Turbofan engine  Supersonic flow  Performance analysis

摘要:

超音通流风扇发动机概念新、优点突出.本文发展的计算机程序能对不同类型发动机进行循环分析和某些参数的优化计算,对一架Ma=2.7的超音巡航运输机进行了算例分析.计算结果表明,超音通流风扇发动机耗油率大大低于常规涡扇和涡喷发动机,重量轻,推重比高,亦有明显优势.有效解决飞行剖面上进气道与发动机相容性问题,对提高推进系统性能关系很大.

Abstract:

The supersonic through flow(STF)fan engine is a new concept with many advantages. To carry out the cycle analysis for STF fan engine, a computer program system for evaluating engines’thermodynamic quality and optimizing its cycle variables has been developed. The program can be used for general turbofan and turbojet engines. Then, a STF fan engine equipped for a transport with cruise Mach number 2.7 was studied,the main results are as follows.At cruise condition,the specific fuel consumption is 2 %(or more) lower for STF fan engine than conventional turbofan engine and 8%(or mo-re)lower for STF fan engine than turbojet engine. At takeoff condition,STF fan engine also has lower specific fuel consumption advantages.Take a one stage 16 degree conical spike inlet as an example,when the entrance area of the STF fan inlet is designed at the takeoff state for a transport mission profile, the mass flow at other mission state can be also obtained fully.The good com- patibility of inlet with STF fan engin’e is the key for a high performance STF fan engine.