Computational Study of Rotating-Stall Inception in Axial Compressors
Computational Study of Rotating-Stall Inception in Axial Compressors
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DOI：
10.2514/2.5147
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发表时间：
1997
影响因子：
1.9
通讯作者：
Li He
中科院分区：
文献类型：
--
作者：
Li He
使用准三维时间推进纳维-斯托克斯方法和混合长度湍流模型对轴流压缩机中的旋转失速初始进行了计算研究。特别令人感兴趣的是与入口停滞压力畸变和转子/定子叶片相互作用相对应的外部圆周扰动的影响。目前的结果表明，就失速单元数量和旋转速度而言，旋转失速开始模式受到小的外周静止或旋转扰动的影响。正如在大多数实验中观察到的那样，第一模式圆周扰动具有最大的不稳定效应，导致单细胞模式在绝对坐标系中以约 50% 的转子速度旋转。以较高绝对速度旋转的短尺度多细胞图案也可能被具有相同圆周长度尺度的扰动所激发。短尺度多细胞模式在孤立的叶片排中比在一个阶段中更持久。在后一种情况下，由转子-定子相互作用引发的短尺度模式将迅速转变为长尺度单细胞模式，并与转速的明显变化相关。
Rotating-stall inception in axial-e ow compressors has been studied computationally using a quasi-threedimensional time-marching Navier ‐ Stokes method with a mixing-length turbulence model. Of particular interest was the effect of external circumferential disturbances corresponding to inlet stagnation pressure distortions and rotor/stator blade interactions. The present results show that rotating stall onset patterns in terms of number of stall cells and rotating speeds were ine uenced by small external circumferential stationary or rotational disturbances. First mode circumferential disturbances had the most destabilizing effect, resulting in a single-cell pattern rotating in the absolute frame at about 50% rotor speed, as is observed in most experiments. Short-scale multiple-cell patterns rotating at a higher absolute speed could also be excited by a disturbance with the same circumferential length scale. Short-scale multiple-cell patterns tended to be more persistent in an isolated blade row than in a stage. In the latter case, a shortscale pattern initiated by a rotor ‐ stator interaction would quickly change into a long-scale single-cell pattern, associated with a distinct change of the rotating speed.