Abstract:Rotating turbulent flows are widely existed in pumps, turbines, compressors and other fluid machinery. The three-dimensional stochastic fluctuations are very strong in this kind of flow. The high adverse pressure gradient, large streamline curvature and complex wall surface in rotating turbulent flow have significant effects on the performance of fluid machinery. Although a lot of turbulence models have been developed, there is no universal turbulence model that could be used to simulate rotating turbulent flow in fluid machinery. Each turbulence model has its own applicable scope. The prediction performance of the existing turbulence models either in physical or numerical aspects has not yet met the actual need of fluid machinery. Aiming at strong rotating and large curvature turbulent flow, the turbulence models were reviewed. From three aspects of the high Reynolds number flow in turbulent core area, the low Reynolds number flow near wall and the transition flow from laminar to turbulent areas, the applicability of existing turbulence models for fluid machinery was analyzed. The problems of two series turbulence models, including Reynolds-averaged Navier-Stokes models and scale-resolving simulation models used in solving rotating turbulent flow were compared. The typical Reynolds-averaged Navier-Stokes models introduced included Spalart-Allmaras, k-ε, k-ω , V2F and RSM models. The typical scale-resolving simulation models included LES, SAS, DES and ELES models. The effective methods to use the suitable turbulence model for different problems and different targets were investigated. The development trend of turbulence model and the application of turbulence model in fluid machinery were discussed.
