Flow in a Radial Impeller with Cavitation

抄録

The cavitation aspect and the water flow in the radial-flow impeller are discussed on the basis of the experiment conducted for a wide range of discharge flow-rate, suction static pressure and revolving speed with a centrifugal pump having three dimensional blades and the vortex chamber. That is, cavitation zones in the impeller are classified into five zones, the results of observation by the strobolight on the process of growth of each cavitation zone is interpreted considering the relation between the cavitation zone and the flow condition of water in the impeller. Above all, some interesting phenomena caused by cavitation such as the discontinuous change of direction of the pump characteristic curve and the discontinuous drop of the pump head are found and the causes of their occurrence are discussed.