热传递对涡轮发动机瞬态性能影响的数值分析

Numerical simulation of effects of heat transfer on the transient performance of gas turbine engines

给出了一种预测热传递对涡轮发动机瞬态性能影响的物理模型,并将该模型与发动机动态特性模拟程序相结合,对某型双轴发动机的加、减速及Bodie加速瞬态性能进行了数值分析。结果表明,发动机瞬态过程中的热传递影响十分显著,尤其是当发动机作Bodie加速时,热传递显著提高加速初始阶段的涡轮前温度,致使压气机工作线明显向其不稳定边界靠近,降低压气机喘振裕度。

A model for predicting the effects of transient heat transfer on the gas turbine engine transient characteristics was presented . This model was added to the program which was used to simulate gas turbine engine dynamic perfonnance and a new program was developed. The program was applied to a two-spool turbine engine, and the transient results during gas turbine engine deceleration, acceleration, and bodie acceleration were given. It was apparent from the trajectory that Bodie acceleration reduced surge margins in the compressors,as compared to snap acceleration. The reason was the remarkable turbine inlet total temperature differences resulted from the effects of transient heat transfer between Bodie acceleration and snap acceleration.