涡扇发动机高空起动模型研究

基于慢车以上的部件级模型,通过外推部件特性,建立了双转子涡扇发动机部件级高空起动模型,可执行高空风车起动或起动机起动仿真.模型考虑了起动过程中油气比对燃烧效率的影响,燃烧室、高低压涡轮的热惯性及起动过程中总压恢复系数的变化,采用容积动力学方法避免了迭代运算,仿真结果表明该模型具有实时性,仿真转速误差小于5%,能够满足发动机高空起动性能仿真的需求.

Research on the startup model of turbofan engine at high altitude

Based on the above-idle component-level model,a two-spool turbofan engine startup model was developed according to extrapolated component characteristics.The model can simulate the startup of windmilling and starter at high altitude.This model has taken into account the influence of fuel-air ratio on combustion efficiency,heat transfer model was built up to estimate the influence of heat transfer on combustor,thermal inertia of combustor and high-/low-pressure turbine as well as the change of total pressure recovery coefficients of different components during startup.The method of volume dynamic was used in order to avoid iterative calculations.The simulation results show that the real-time model has a simulated speed error less than 5%,making it possible to meet the demand of high-altitude startup performance simulation for aeroengine.