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

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-epsilon model, realizable k-epsilon model, standard k-omega model, shear stress transport k-omega model, v(2)-f model 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-epsilon model, realizable k-epsilon model, v(2)-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-omega model and shear stress transport k-omega model overestimate corner separation region at incidence of 0 degrees. The turbulence characteristics are discussed and turbulence anisotropy is observed to be stronger in the corner separating region. (C) 2016 Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics.