Abstract
The objective of this work is to study experimentally the characteristics of jet pump. Suction head, driving air pressure and the percentage of the distance between throat section and nozzle are recorded. The effect of each parameter on the pump performance is investigated, in order to have a better understanding about the behavior of such pump under various conditions. A simple geometry jet pump was designed, developed and tested. The experiments show that we should be careful in increasing the suction head, and stability must be considered between the suction head and the driving air mass flow rate. While the effect of increasing Pa will stop at certain maximum of the ratio of the mass flow rate of water to air (M), that is any increase in Pa will meet no change in M. While increasing S/Dth will leads to decrease in the percentage of M because the optimum S/Dth = 0.5 so that at this value we will have the best performance and any other values for S/Dth the percentage M will decreases, but this effect is not so clear and it could be neglected. The pump performance is not so sensitive with the change of S/Dth after S/Dth = 0.5. Also this information will help improving and extending the use of the jet pump in many practical applications.
Highlights
The jet pump is a low-pressure high volume flow rate pump
The experiments show that we should be careful in increasing the suction head, and stability must be considered between the suction head and the driving air mass flow rate
In this work the jet pump is studied experimentally to investigate the effect of Suction head, driving air pressure and the percentage of the distance between throat section and nozzle on the pump performance
Summary
The jet pump is a low-pressure high volume flow rate pump. Simplicity of design, absence of any moving parts, ability to handle muddy water, reliability, ruggedness, and low cost, more than compensate for the relatively poor efficiency of the pump. Vogal [7] measured the static pressure rise in a very long throat length up to 20 diameters in length, the results illuminated an often over looked point that is the dependence of optimum throat length on the flow ratio M, regardless, of the design area ratio of the pump. For an area ratio of R = 0.219 he found that the pressure rise in the mixing throat is at 5.3 diameters at low secondary flows approaching the cut-off point, and the required or optimum mixing length increased many times the diameters at high values of the flow ratio m, i.e., under low Pd conditions. Hammoud [10] showed that nozzle to throat spacing to nozzle diameter ratio (L/D), for optimum jet pump performance the drive pressure was of 1.5 bar, while increasing the motive pump pressure the pump performance decreased. Kumaraswamy [11] insured that nozzle to mixing tube spacing play an important role in the performance of the jet pump
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