基于改进流线曲率法的环形扩压器数值分析

环形扩压器是高涵道比发动机中使用的过渡流道的基本形式。使用高性能的过渡流道是降低低压涡轮级的负荷系数,提高涡轮效率的重要手段之一。发展了环形扩压器性能预测的方法,基于改进的流线曲率法对环形扩压器进行数值模拟,重点分析了影响性能计算的诸多因素。同时,模拟计算四种不同旋流角时扩压器的性能,给出了扩压器的速度和压力分布,揭示了不同旋流角对扩压器性能的影响,给出了最佳旋流角的数值。比较和分析了数值结果和实验结果之间的区别,分析了粘性和掺混对扩压器的影响。通过对两组数据的对比,解释了掺混作用对性能计算的影响,论证了算法的可行性。

Numerical Analysis of Annular Diffusers for Turbomachinery

As the basic form of the intermediate duct for the high bypass turbo- fan engine, using high per- formance annular duct is one of the best methods to reduce the load and improves the efficiency of low- pressure turbine. A performance prediction system is established based on the renewed streamline curva- ture method. The factors involving in this method are specifically explained. In addition, an actual diffuser with different swirl angles is analyzed by this method. The velocity and pressure profiles are figured out. The numerical results confirm the experimental results, which also demonstrate the feasibility of the algo- rithm.