涡轮轴断裂条件下空气系统强瞬变过程分析

建立了针对空气系统强瞬变过程的控制方程及模块化仿真模型,该模型包括构成瞬态空气系统网络的4类基本元件:容腔元件、节点元件、管道元件和节流元件。上述基本元件及其组合单元的仿真结果与公开的文献数据能够较好的吻合,证明该模型能够模拟容积效应、惯性力作用占主导的强瞬变空气系统演化。在此基础上,仿真分析了某型航空发动机高压涡轮(HPT)轴断裂失效条件下的空气系统强瞬变过程。结果表明,涡轮轴的断裂失效能够引起空气系统内部复杂响应过程,并能导致涡轮盘所受的轴向力反向。该瞬态空气系统模型成功模拟了气流参数毫秒时间量级的动态响应,为深入研究航空发动机内部复杂空气系统的瞬变机理提供了有效的技术手段。

Dynamic analysis of air system with fast transients in shaft failure event

This study established the governing equations and the corresponding modularized simulation model for air system in rapid transients. The modularized model consists of four kinds of basic components that constitute the transient air system network: pressure vessels, nodes, ducts, and throttles. The validation of the modular components and their assemblies against published data has been demonstrated to be successful. The model is proved to be able to handle volume packing effects and flow inertia effects that account for the main contributions to fast transient scenarios. On this basis, the model is utilized to analyze the flow evolution of air system in aero engine high pressure turbine (HPT) shaft failure event. The results show that the shaft failure can lead to complex dynamic response in the air system and the subsequent reversal of the turbine disk endload. The model established in this study successfully predicts the air system transient response within millisecond time scales, which provides an effective approach to gain insight into the complex transient mechanism of aero engine air system.