On the Unusual Pressure Rise at Turbine Pump Guide-Vane Entrance

Abstract

Under working condition, there happens an unusual high pressure rise at the guide vane entrance whenever the impeller blade tips pass the front of the guide vane passage. This unusual rise of pressure varies extremly according to existence or nonexistence of the cavitation in the pump. We analysed this phenomenon by means of Sulzer's experimental results which had been obtained by Siemens Oscillograph and then, we separated it into factors and attached theoretical meaning to it. We have made it clear that the only course of unusual pressure rise is the forced vibration of cavities in the turbine pump guide-vane entrance and differs of cavitation in infinite boundary as in the investigation reporeted by Knapp.