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建立了具有涡轮叶尖间隙计算功能的发动机实时模型并设计了主动间隙控制系统,以反映涡轮叶尖间隙控制对发动机动、静态性能的影响。提出以半无限平面瞬态热传导与多项式拟合相结合的方法,更准确计算发动机动态过程中变化的叶尖间隙;基于涡轮叶尖间隙的变化量和涡轮性能参数的关系实时修正当前涡轮性能参数,提高了常规发动机部件级模型的计算准确度,且涡轮叶尖间隙每减少0.25mm,涡轮效率提高1%,耗油率下降1%;在分析气冷式主动间隙控制系统的基础上,设计了一种可以控制叶尖间隙变化的机械式主动间隙控制系统,使动态过程中变化的叶尖间隙始终处于指令间隙。通过对发动机地面加速过渡过程和巡航减速过渡过程的仿真,验证了上述方案的有效性。
The real-time model of the engine with turbine tip clearance calculation function is established and the active clearance control system is designed to reflect the influence of turbine tip clearance control on the dynamic and static performance of the engine. The method of combining semi-infinite plane transient heat conduction and polynomial fitting is put forward to calculate more accurately the tip clearance which varies during the dynamic process of the engine. Based on the relationship between the variation of turbine tip clearance and turbine performance parameters, the current turbine performance parameters , The computational accuracy of conventional engine component level model is improved, and for every 0.25mm reduction of turbine tip clearance, the turbine efficiency increases by 1% and the fuel consumption rate decreases by 1%. Based on the analysis of air-cooled active clearance control system, A mechanical active clearance control system that can control the tip clearance changes, so that the tip clearance changes in the dynamic process is always in the command gap. The effectiveness of the above scheme is verified through the simulation of the acceleration process of the ground acceleration and the process of cruising and decelerating transition.