Abstract
Experiments on air/water two-phase flow performance were carried out using a centrifugal pump with five kinds of closed impellers, each of which has a different outlet or inlet blade angle. Results are described as follows. (1) A sudden head drop due to gas accumulation in the impeller occurs at a low inlet void fraction with high inlet or outlet blade angle of impellers. (2) A degraded pump head at a high inlet void fraction becomes higher with increasing outlet blade angle. These results are discussed in terms of numerical calculations of one-dimensional two-phase flow.
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