Transition performance simulation of turbine shaft fracture in high bypass ratio turbofan engine with split flow
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摘要: 为了研究双轴大涵道比分排涡扇发动机轴断裂失效后的动态性能，找出涡轮轴断裂后最先发生的危害事件，建立能够模拟气流参数毫秒时间量级动态响应的大涵道比分排涡扇发动机共同工作方程和性能模型。计算分析了地面起飞状态和巡航状态下某大涵道比民用涡扇发动机分别在高、低压轴断裂后发动机气路参数的瞬态响应规律和机理，为主被动安全设计提供参考。结果表明：高、低压轴断裂后几十毫秒内最先发生的危害性事件分别是中压压气机喘振和涡轮转子超转；同时涡轮前温度会有所升高。Abstract: To deal with the dynamic performance of biaxial high bypass ratio turbofan engine with split flow in shaft fracture event and find out the first hazardous event after shaft fracture，the common working equation and performance model of high bypass ratio turbofan engine with split flow capable of simulating the dynamic response of airflow parameters in millisecond time scale were established based on the simulation platform independently developed.The dynamic response of airflow parameters was simulated in the order of milliseconds in the model.The transient response law and mechanism of gas path parameters of a civil turbofan engine with high bypass ratio under high and low-pressure shaft fracture in the take-off state and the cruise state were calculated and analyzed by using the model，which provided a basis for the design of passive safety.The results showed that the first hazardous events that occur within a few tens of milliseconds after the shaft fracture of the high and low-pressure shafts were the surge of the medium-pressure compressor and the over-rotation of the turbine rotor；at the same time，the temperature rose in front of the turbine.
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Key words:
- zero-dimensional simulation /
- performance model /
- shaft fracture /
- dynamic simulation /
- passive safety
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