The advantages and disadvantages of several commonly turbulence model in centrifugal pump inner flow simulation were analyzed. Two new models based on SST k—ω turbulence model were improved with considering the effects of rotation and curvature. The procedures of new models were implemented on the open source code OpenFOAM. Simultaneously, the new turbulence models were adopted to simulate the inner flow in a centrifugal pump with different specific speeds under different operating points. Lastly, comparisons were made with experimental results and the numerical results from the original and modified models. The results showed that the modified models could calculate the inner flow of centrifugal pump successfully, and energy performance by new models was closer to experimental results than that of original model.