Abstract: By using the k-ε turbulent model modified to consider the curvature and rotation, applying SIMPLE – C algorithm to make pressure – velocity correction equation, utilizing Alternative Direction Implicit method to solve linear equations, the 3 – D incompressible turbulent flow in the impellers of non – overloaded centrifugal pumps in computed. It shows that there exists back flow in the inlet and secondary flow in the outlet, etc. , which will be supportive to the optimal design of non – overload centrifugal pumps on the basis of flow field calculation.

Key words: Centrifugal pump, Computational fluid dynamics, Non – overload, Turbulent flow