Abstract

The efficiency of the centrifugal pump depends very largely on the efficiency of converting the kinetic energy of the water leaving the impeller into the pressure form. There are the two methods of enorgy-conversion generally adopted by designers of centrifugal pumps : one is to use the vortex or whirlpool chamber and the other the guide vane. And modern pump design appears to be tending to use the vortex chamber for low and medium types and the guide vane for high pressure type. The object of the experiments is to study if any variation in the efficiency and other characteristics of a high pressure centrifugal pump occurs, when fitted with guide vanes of different vane angle at entrance and divergent vortex chamber without guide vanes. This is the results obtained in each case. The comparison between the guide vanes and vortex. chamber is perhaps best seen from the attached figures. It would be generally stated that even for a high pressure centrifugal pump the good efficiency is obtainable from vortex chamber pump as from guide vane pump provided that a correct design of the vortex chamber is made, and also, that since the efficiency of the pump fitted with guide vane depends largely on the suitability of the vane angles, great care should be taken in the determination of the vane angle.