To optimize the aerodynamic performance of turbine blades by CFD method,using the Reynolds-averaged Navier-Stokes method,numerical simulations were conducted for three typical turbine models with blade heights of 66,44,and 22 mm,which are commonly encountered in engineering applications.The computational results were compared with experimental measurements.Additionally,through a numerical simulation method-large eddy simu-lation,unsteady calculations were performed for the 22 mm blade height model,and the results agreed well with ex-perimental data in terms of isentropic efficiency,mass flow rate,and other macroscopic flow parameters.In the three-dimensional flow field,the flow at the root and tip of the turbine blades exhibited more complexity.The re-search findings indicate that the Reynolds-averaged Navier-Stokes method can provide reasonably accurate assess-ments for turbine models with blade heights of 66 and 44 mm.However,for the 22 mm blade height turbine,only the large eddy simulation method could effectively capture the turbulent flow details near the end-wall region.Sig-nificant losses were observed in the blade tip region,where the Reynolds-averaged Navier-Stokes method did not accurately capture the pulsating flow details,and thus,the flow near the end-wall region of short blades could not be accurately computed.
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