CAVITATION SWIRL PROPAGATION IN ENTRANCE PIPE OF CENTRIFUGAL PUMP

摘要

Prerotation flow in the entrance pipe of turbomachines is created as a result of the larger category of secondary flows and it is important for pump hydraulic performance determination. This flow is an interaction, with the pump cavitation, especially regarding cavitation swirl, that is the time and place depending on the flow properties (of pump operating capacity and pump head). Experimental analysis of the cavitation swirl pressure pulsation, measured at the entrance (suction) pipe is given. A tested radial pump is installed in a special testing system. The results are discussed and given regarding time and frequency domain depending on the pump operating properties, especially those of the entrance flow pressure. Basic outlines for mathematical model for swirl frequency and magnitude modeling are given.