A Study of Supercavitating Pumps : 1st Report, Pump Performance and Cavitation on impeller Blades

概要

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Experiments on two supercavitating pumps, pumps A and B, were carried out to investigate the characteristics of supercavitating pumps. The two pumps were designed for the specific speed N_s of 3,300 (in units m, m^3/min, rpm) and the suction specific speed S of 2,000. In the design of the impeller of pump A experimental data obtained by Wade and Acosta on supercavitating cascades of planoconvex hydrofoils were used. Wu's theory on supercavitating circular are hydrofoils was applied to design the impeller of pump B. Following results were obtained by experiments. The performance of pump A is N_s 3,030,S 2,320 and efficiency 59.4%, and that of pump B is N_s 3,440,S 3,260 and efficiency 51.8%, under supercavitating conditions. It was confirmed that specific speed and suction specific speed of supercavitating pumps were much higher than those of conventional axial flow pumps.
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