加力涡扇发动机过失速/旋转失速特性分析

Modeling the rotating behavior of an augmented turbofan engine

关键词:  涡扇发动机  发动机故障  旋转失速  失速特性  数值仿真

Key words:  Turbofan engine  Engine failure  Rotating stall  Stalling characteristics  Numerical simulation

摘要:

研究了混合加力涡扇发动机过失速特性数值模拟方法。采用了轴流压缩系统的逐级动态响应模型 ,并发展了风扇出口分流环内外流耦合分析模型。采用两种不同方式诱导了涡扇发动机过失不稳定流态。结果表明发动机的函道比的动态突变可成为预测涡扇发动机进入不可恢复失速状态的关键参数

Abstract:

A digital computer model was developed to simulate post stall operation of an augmented turbofan engine. The model was based on stage by stage dynamic response code. A new method was developed to model the dynamic flow at the fan exit properly. Nozzle minimum area and afterburner fuel transient simulation were conducted to induce the post instability.The operation and the sequences of events leading to rotating stall were investigated . The typical behavior and performance of the turbofan engine during the rotating stall were obtained . A significant parameter,which may predict the nonrecoverable stall event was found.