Numerical and Experimental Study on the Shutdown Transition Process of a Large Axial Flow Pump System Focusing on the Influence of Gate Control

Large axial flow pump systems (LAPS) are widely used in coastal stations. In the actual operation of a LAPS, various accidents often occur during shutdown due to unreasonable control stop measures such as gate. this paper, based on secondary development Flowmaster numerical software, simulation study was conducted process LAPS with different gate laws. It found that MBV greater if closed more slowly after unit powered off. When 30 s scheme used, 1.63Qr. 60s long 1.67Qr, an increase 2.45%. 150s MVV stopping reached 1.68Qr, which is 3.07%. The method closing advance can significantly improve violent fluctuations KCPs transition and will effectively reduce backflow reverse speed process. Taking total time 120 example, when 25% advance, MRS were reduced by 14.31% 1.93%. scenario preclosing 100% gates adopted, 96.31% 100%.