民用大涵道比涡扇发动机吸雨能力评估的方法研究

摘要

从发动机吸雨后性能改变的基本原理出发，建立了部件气动热力损失、机械损失和工质热力学通用模型，借鉴适航咨询通告初步定义了关键吸雨工况及水含量。基于商用性能分析软件，对一个大涵道比9的涡扇发动机各项性能的变化进行了计算与分析，提出了一种定量描述发动机吸雨能力的评估方法。%Rain ingestion in aero engine could cause compressor surge, combustor blow-out, mechanical damage and occasionally significant thrust lost. The paper analyses the effect of rain ingestion on the engine performance and describes a generalized model to estimate the mechanical, aerodynamic and thermal impact on the engine. These estimates are then used to evaluate the rain ingestion capability of a turbofan engine.