Author(s)

R. Klasinc, R. Logar & A.Predin

Abstract

On a cavitation test stand the hydraulic resistance-head loss coefficient was measured at a sudden pipe expansion in a closed circuit. The results were compared using a well-tried calculating method (impulse loss after Borda- Carnot). Then, the head loss coefficients were measured for certain cavitation numbers. This showed that only very severe cavitation influences the head loss coefficients. Over a large range of cavitation numbers, the loss coefficient remained unaffected. The same behaviour was revealed by velocity profile measurements. Surprisingly, the fluctuating components of the velocities (RMS values) corresponded for cavitating and non-cavit

Keywords