论文部分内容阅读
在非设计工况下,压气机叶栅角区的三维分离加剧,流场内的湍流处于较强的非平衡状态,因此必须对于非平衡状态的湍流的输运过程给出准确的预估.基于不同工况下压气机内角区分离流动的湍流输运过程的分析,提出了一种修正Spalart-Allmaras(S-A)模型中模拟湍流黏性生成和耗散关系的改进方法,经过数值研究发现改进的S-A模型对于静子角区分离的模拟更接近物理实际,从而提高了对非设计工况的预估能力.
Under non-design conditions, the three-dimensional separation of the compressor cascades is exacerbated and the turbulence in the flow field is in a strong non-equilibrium state. Therefore, it is necessary to give an accurate prediction of the turbulent transport process in an unbalanced state. Based on the analysis of the turbulent transport process of the separation flow in the internal corner region of the compressor under different operating conditions, an improved method to correct the relationship between the turbulent viscosity generation and dissipation in the Spalart-Allmaras (SA) model is proposed. After numerical analysis, The SA model is closer to physical reality for the separation of stator angles and thus improves the ability to predict non-design conditions.