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对某压气机二维叶栅的非定常分离流场进行了数值模拟,通过对多种工况的计算,进行了频谱分析,对叶栅非定常流动的流场结构和流动机理做了初步的探讨。在来流均匀,定常边界条件下,叶栅内流动仍然表现出强烈的非定常性;在大攻角下有类卡门涡的脱落;旋涡脱落的频率,随着攻角和马赫数的变化而变化;分离点的位置随着攻角和马赫数的变化而变化。
The unsteady flow field of a two-dimensional cascade of a compressor is numerically simulated. The frequency spectrum analysis of a two-dimensional cascade of a compressor is carried out. The flow field structure and flow mechanism of cascade unsteady flow are preliminarily studied Discussion. Under the condition of even flow and steady boundary, the flow inside the cascade still shows a strong unsteady flow; at the high angle of attack, there is a fall of the quasi-Karman vortex; the frequency of vortex shedding changes with the angle of attack and the Mach number Change; separation point position with the angle of attack and Mach number changes.