动静干涉效应对轴流透平级气动性能的影响

INFLUENCES OF ROTOR-STATOR INTERACTION ON THE PERFORMANCE OF AXIAL-FLOW TURBINE STAGES

本文对Aachen一级半轴流式透平进行了准定常及非定常流动的数值模拟,讨论了引发动静干涉效应的主要因素,分析了非定常效应对叶栅通道中脉动速度、气流角、型面压力分布以及损失结构的影响。结果表明,对于Aachen透平而言,上游叶片排的尾迹区及二次涡是引发下游叶栅通道流场强非定常特性的最主要因素,引起了脉动速度、型面压力、攻角以及损失的较大变化,从而对透平级性能产生较大的影响。

Numerical simulations on the quasi-steady and unsteady flow in Aachen 1-1/2 Axial-Flow turbine stages are performed in this paper, and the influences of the rotor-stator interaction on the fluctuating velocity, flow angle, wall-pressure and loss mechanism are discussed. Results show that in Aachen turbine stages, the wakes and secondary vortices of the upstream blade row are the key factors causing the strong unsteady flow characteristics in the downstream blade rows and lead to significant changes in fluctuating velocity, wall-pressure, flow angle and losses, as a result, the performance of the turbine stages is greatly influenced.