Cavitation Tests on an Axial Flow Pump

概要

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Cavitation tests on an axial flow pump were made over a wide range of operating conditions. Through these tests, the aspects of cavitation in the impeller were observed with a strobolight and variation of the pump characteristics was studied. A parameter σ_s to represent the suction condition was introduced to give the cavitation limits for any flow rate. The pump head showed little change until the cavitation on the blade surface was developed considerably, while the shaft horse-power began to increase slightly with the incipient cavitation on the blade, decreasing abruptly as the pump head dropped due to the growth of cavitation. So that the efficiency showed gradual decrease as the incipient cavitation grew. The cavitation limits concerning the incipience on the blade and variation in pump performance are presented against the flow rate in terms of the parameter σ_s as well as in the suction specific speed.
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