涡扇发动机低压部件通流耦合计算

Research on Coupled Throughflow Calculation of Turbofan Engine Low-pressure Parts

为了研究各部件匹配与过渡段几何参数对发动机总体性能的影响,针对某涡扇发动机风扇、低压涡轮、内外涵道、掺混段和尾喷管等部件,基于周向平均Navier-St okes通流控制方程,采用时间推进有限体积法进行了部件耦合计算求解,将沿程各部件性能计算参数与试验做了对比,结果表明:在设计状态下发动机沿程各截面计算特征参数与试验值最大误差不超过5.0%,说明该通流耦合计算方法能够快速预估发动机总体性能,完善各部件匹配关系,在发动机总体设计初期有一定工程应用价值。

Purpose of this paper is studying influence of component matching and transition geometric parameter on engine overall performance. It is in accordance with parts of a turbofan engine,such as fan,low-pressure turbine,internal and external bypass,mixing section and nozzle. On the basis of circumferentially averaging Navier-Stokes through-flow governing equations,time marching finite volume method was adopted, every component performance calculation parameter along the passage was compared to experiment. The results indicate that, in design point, the max error of characteristic parameters between calculation and experiment data of every section along engine is within 5%. It shows that the throughflow coupling calculation method is able to predicate engine overall performance quickly and improve matching relationship of every part. Therefore, this method is valuable in preliminary design stage of engine.