STUDY OF THE DIFFERENT PARAMETERS THAT INFLUENCE ON THE PERFORMANCE OF WATER JET PUMP

The aim of this study is to investigate the performance of water jet pump. This study is reported in a series of three papers. In this paper, the performance of water jet pump was studied. The effects of the pump operating conditions and geometries on its performance were investigated. The experimental rig was constructed such a way it can be changing the driving nozzle, mixing chamber and diffuser. During experimental program water is used in both motive and pumped sides. In this study three different diameters of driving nozzles, namely (10, 12.7 and 16 mm) have been used with one mixing chamber of 25.4 mm diameter (i.e. three different area ratios of 0.155, 0.25 and 0.4). Furthermore three different mixing chamber lengths to mixing chamber diameter ratio of 6.75, 7.25 and 7.86. And three different diffuser angles of 4 o , 5.5 o and 7 o respectively with one suction nozzle of semi cone angle of 22 o . The effect of nozzle to throat spacing to nozzle diameter ratio "X" with values of 0 D, D, 1.5 D and 2 D, on the jet pump performance was also tested under different flow rates and motive pressures. In all cases, it was found that the best efficiency for the jet pump is attained with "X" equal one, and the best values for these design parameters have been obtained from the experimental work. The performance of slurry jet pump and the comparison between them will later be discussed in another further paper.