涡扇发动机部件级起动模型

基于慢车以上部件级模型,通过外推部件特性,建立了双转子涡扇发动机起动模型,可执行地面状态下发动机从近似为零的初始状态加速至慢车的起动过程仿真.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较好的精度和实时性,动态误差小于5%,满足了某型发动机起动过程半物理仿真的需求.

Development of Component-Level Startup Model for a Turbofan Engine

Based on the above-idle component-level model,a two-spool turbofan engine startup model was developed using extrapolated component characteristics.The model can simulate the whole startup process on ground from near static conditions to idle.The influence of the fuel-air ratio on combustion efficiency was taking into account.Heat transfer model was also established to estimate the influence of heat transfer on combustor,high pressure turbine and low pressure turbine.The total pressure loss coefficients of different components varied with the high rotor speed.The method of volume dynamics was used in order to avoid the iterative calculations.Results show that the accuracy of the real-time model is good,and the dynamic simulation error is less than 5%.The model meets the requirements of semi-physical simulation.