Transient Behavior of a Cavitating Centrifugal Pump at Rapid Change in Operating Condition. 2nd Report. Transient Phenomena at Pump Starting/Stopping.

Abstract

In the 1st report, the transient characteristics of a cavitating centrifugal pump were related to the cavitation behavior at sudden opening or closure of discharge valve. In the 2nd report, experimental study was extended to transient behavior of cavitating centrifugal pump at the quick starting/stopping of pump. Unsteady pressure as well as flow rate was related to the time-dependent cavitation behavior in the manner similar to quick discharge valve operation case. As a result of the present study, pressure fluctuation was found to occur due to water column separation or oscillating cavitation at rapid transient operations. And experimental results indicate that transient phenomena at opening of discharge valve and pump starting are quite different from those at closing of discharge valve and pump stopping.