Cavitating Flow in the Volute of a Centrifugal Pump at Flow Rates Above the Optimal Condition

Cavitation is regarded as a considerable factor causing performance deterioration of pumps under off-design conditions, especially at overload conditions. To investigate the unsteady cavitation evolution around tongue pump volute, and its influence on flow field within passages impeller, numerical calculations several hydraulic tests were performed typical centrifugal with shrouded impeller. Emphasis was laid blade-loading distribution rates above optimal value. Results indicated that vapor likely to first emerge from volute rather than leading edge blades In contrast designed condition, in each passage obviously different. The rate reaches maximum just past location tongue, while minimum value projected appear upstream. squeezes area outlet corresponding thereby huge growth impeller outlet.