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对压气机二维动叶栅,采用单通道和多通道计算模型进行了大涡模拟(LES),研究了节流过程中内部流场的非定常波动特征,分析了旋涡结构和波动频率的变化规律.结果表明:大流量工况时,前缘绕流和叶片吸力面分离产生的两种非定常波动共存,波动频率随压气机节流基本保持不变,此时吸力面分离表现为小尺度旋涡结构;近失速工况时,吸力面发生大尺度的流动分离,波动频率明显下降,低于叶片通过频率.
Large-eddy simulation (LES) was carried out on the two-dimensional compressor cascade with single-channel and multi-channel calculation models. The unsteady fluctuation characteristics of the internal flow field during throttling process were studied. The variation of the vortex structure and the fluctuation frequency The results show that there are two kinds of unsteady fluctuations caused by the flow around the leading edge and the suction surface of the blade coexist in the high flow rate conditions and the fluctuation frequency basically keeps unchanged with the throttling of the compressor, Vortex structure; In the near-stall condition, large-scale flow separation occurs on the suction side, and the frequency of fluctuation obviously decreases, which is lower than the blade passing frequency.