Numerical study of corner separation in a linear compressor cascade using various turbulence models

• Published in: Chinese journal of aeronautics 2016-06, Vol.29 (3), p.639-652
• Main Authors: Liu, Yangwei, Yan, Hao, Liu, Yingjie, Lu, Lipeng, Li, Qiushi
• Format: Article
• Language: English
• Subjects: Cascades; Compressor cascade; Compressors; Corner separation; Corners; Mathematical models; Separation; Turbomachinery CFD; Turbulence anisotropy; Turbulence models; Turbulent flow; 分离流; 剪切应力; 压气机叶栅; 应用; 数值研究; 标准k-ε模型; 湍流模型; 直线
• ISSN: 1000-9361
• DOI: 10.1016/j.cja.2016.04.013

Three-dimensional corner separation is a common phenomenon that significantly affects compressor performance. Turbulence model is still a weakness for RANS method on predicting corner separation flow accurately. In the present study, numerical study of corner separation in a linear highly loaded prescribed velocity distribution （PVD） compressor cascade has been investigated using seven frequently used turbulence models. The seven turbulence models include Spalart Allmaras model, standard k-e model, realizable k-e model, standard k-to model, shear stress transport k co model, v2-fmodel and Reynolds stress model. The results of these turbulence models have been compared and analyzed in detail with available experimental data. It is found the standard k-1： model, realizable k-e model, v2-f model and Reynolds stress model can provide reasonable results for predicting three dimensional corner separation in the compressor cascade. The Spalart-Allmaras model, standard k-to model and shear stress transport k-w model overesti- mate corner separation region at incidence of 0°. The turbulence characteristics are discussed and turbulence anisotropy is observed to be stronger in the corner separating region.