Abstract
A similarity law is proposed and verified, using a pump operating at several speeds of rotation. The work on the liquid by the rotor and the work on the gas by the liquid are theoretically calculated. The comparison of the calculated work with the ideal work shows some of the causes of energy dissipation. At a low speed and at a high compression ratio, the pump does not operate properly. The mechanism of abnormal operation is explained and the critical condition was measured for a pump with three different types of discharge ports.
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