环境湿度对民用涡扇发动机性能影响研究

环境湿度会对民用涡扇发动机的性能产生影响.在发动机部件匹配方法的基础上,引入湿度对气体性质和部件特性的修正模块,建立环境湿度对民用涡扇发动机影响的仿真模型;定量分析不同湿度对发动机推力、转速、进口流量等性能参数的影响,得到相应的湿度修正曲线;按照CCAR-25部中有关湿度的考核要求,计算相应湿度对发动机飞行包线内的六个典型工况的影响;将本文发展的仿真模型所得结果与文献结果进行对比.结果表明:发动机高温起飞时受湿度影响最大,其推力下降了0.56％;为了弥补推力损失,风扇相对换算转速需要提高0.23％;本文所得某涡喷和某涡扇发动机的修正曲线与文献结果趋势一致、量级相当,验证了仿真模型的可靠性.

Research on the Ambient Humidity Effect on Civil Turbofan Engine Performance

In order to analyze the humidity effect on civil turbofan engine performance parameters, the humidity correction module for gas property and component characteristics are led into the engine based on components match method, and the simulation model of ambient humidity effect on civil turbofan engine is established. The humidity effect on engine thrust, spool speed and inlet mass flow are analyzed, and the correction curves are obtained. According to the humidity requirement stipulated in the airworthiness regulation of CCAR 25, the humidity effect on 6 key operating conditions in the flight envelope is simulated. Results show that the engine will be affected most on the hot day takeoff, and the thrust will be decreased by 0.56 percent. In order to recuperate the thrust loss, the fan relative correct speed should be raised by 0.23 percent. The simulation results are compared with the humidity correction curves provided by the reference, and the same trend and similar order of magnitude verify the reliability of the simulation model.