Abstract
Investigations based on experimental measurements and flow dynamics analysis have been completed to reveal the mechanism of flow separations in the pump flow. The possible flow separation including the rotating stall in the vaned diffuser under the normal flow condition has been confirmed to be merely a diffuser effect and caused by the oversized expansion angle of the diffuser. The part load flow separation of both the stationary and the non-stationary character has been identified to have its occurrence origin in the flow at the impeller inlet. The mechanism of the flow separation at the impeller inlet has been revealed with respect to the built-up of a flow dynamical barrier on the shroud side. It exactly explains the coincidence of the flow separation at the impeller inlet and that at the impeller outlet. To quantify the onset of the flow separation, a hypothesis is established based on the revealed mechanism. This has been satisfactorily validated by the test based on the flow visualization, pressure measurements and LDA applications. The method for stability control of the pump flows with effective suppression of the flow separation has also been presented.
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