精细化涡扇发动机过渡态建模与验证

Refined Turbofan Engine Transient State Modeling and Verification

关键词:  涡扇发动机  叶尖间隙  热存储  过渡态  部件级模型  传感器误差

Key words:  Turbofan engine  Tip clearance  Thermal storage  Transient state  Component-based model  Sensor error

摘要:

为了提高涡扇发动机过渡态性能仿真的精度并实现过渡态性能计算模型的工程应用，梳理了不同因素对涡轮发动机过渡态性能的影响机理，介绍了各影响因素的建模方法，在此基础上建立了精细化涡扇发动机整机过渡态性能仿真模型。研究分析了总温、总压和燃油流量传感器的过渡态效应及其建模方法。最终利用涡扇发动机整机地面台架加减速性能试验数据对精细化过渡态模型进行了验证，结果表明：高低压物理转速、推力、压气机出口总压和内涵排气温度的平均误差分别为0.45%，0.77%，0.61%，0.44%和1.77%，最大误差分别为2.82%，1.92%，7.45%，5.67%，5.28%，加速时间的误差小于0.26s。本文揭示了过渡态性能仿真模型误差的机理。

Abstract:

To improve the precision of the transient performance simulation of turbofan engine and to realize its engineering application， the influence mechanism of different factors on the transient performance of turbine engine is investigated. The modeling method of different factors are introduced， and on this basis， a refined simulation model of the transient state performance of a turbofan engine is established.The transient state effects of the sensor of total temperature， total pressure and fuel flow are studied and modeled. Finally， the refined transient state model is verified by the transient performance test data of acceleration and deceleration performance on the ground test stand of the turbofan engine. The results show that the average errors of high pressure spool speed， low pressure spool speed， thrust， compressor outlet total pressure and internal exhaust gas temperature are 0.45%， 0.77%， 0.61%， 0.44% and 1.77%， respectively， the maximum errors are 2.82%， 1.92%， 7.45%， 5.67% and 5.28%， respectively， the error of acceleration time is less than 0.26s. The study in this paper illustrates the mechanism that causes the error of the transient state performance simulation model.