Performance of a regenerative pump for automobile was tested and carefully corrected to obtain performance of the pump. Flow calculations are also performed in one vane to vane region of the impeller and side channel. Corrections of leakage loss and performance reduction in the transient regions at the inlet and outlet are discussed in the study. The calculated values are good coincident with the measured and corrected values near the design and high flow rates. The flow is very complex three dimensional with a strong radial vortex due to centrifugal force and an axial vortex due to re-circulating flow between the impeller and the side channel. Momentum exchange on the plane between the impeller and the side channel are evaluated to estimate viscous losses in the pump. The present study contributes to showing the capability of flow simulation of complex flow in the regenerative pump by comparing the calculated performance with the measured value.

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