Numerical Simulation Of Turbulent Flow Through Compressor Cascade Blade Using Different Turbulence Models

At the present time, many variations of turbulence models are available. However, no unique turbulence model exists which can predict satisfactorily all turbulent flows. Each turbulence model can be applied successfully to some turbulent flows but not satisfactorily to others. For this reason numerical predictions, made using Computational Fluid Dynamics (CFD), are presented describing the behaviour of the performance of three two-equations turbulence models: the standard k-ε and k-ω and the SST (Shear Stress Transport) turbulence model. Comparaison are made in order to evaluate their predictive capability for turbulent flow through double-circular-arc axial compressor blade geometry ,giving emphasis to the accurate modeling of separated flow . The grid for the all geometries used in this investigation was created using the Gambit package, and the predictions from the CFD models have been obtained using the commercial CFD code Fluent. Computational results are compared with an available experimental data, which showed fair agreement taking in account errors in both experimental data and numerical resuIts.The SST model gives the best overall agreement on the static coefficient pressure, the mean velocity profiles and turbulence level, whereas the performance k-ω and the k-ε model is reasonably good. The performance of the k-e model is less good near the blade surface and for cases which presents a massively separation.