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为了研究在实验中发现的角区分离区域内速度概率密度分布(PDF)双峰现象并探索其机理,利用脱体涡模拟(DES)对压气机叶栅中角区分离流动进行数值模拟,成功模拟出双峰现象,并讨论了双峰现象的可能机理。DES模拟结果中,双峰点位置以及内外峰随双峰点位置变化而此消彼长的发展趋势与实验结果一致。对来流攻角脉动特性的分析表明,角区分离中双峰现象与叶栅前缘附近非定常来流和角区内分离流动的相互作用有关。
In order to study the bimodal phenomenon of velocity PDF distribution and to explore its mechanism in the isolated region of the angular zone, the desorption eddy simulation (DES) was used to simulate the separation flow in the corner region of the compressor cascade. The bimodal phenomenon is simulated and the possible mechanism of bimodal phenomenon is discussed. In the DES simulation results, the development trend of the double peak position and the internal and external peaks with the change of the double peak position are consistent with the experimental results. The analysis of the characteristics of the pulsating flow at the angle of attack shows that the bimodal phenomenon in the angular separation is related to the interaction between the unsteady flow near the leading edge of the cascade and the separation flow in the angular zone.