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CFD modelling of a jet pump with circumferential nozzles for large flow rates

Lisowski E., Momeni H.

Archives of Foundry Engineering

2010

Vol. 10, iss. 3 spec.

69--72

Jet pumps are devices which are widely used in transport of dangerous or aggressive goods, contaminations like solid particles or even food. The principle of jet pumps which is transferring energy of one fluid that is called primary or motive is transferred into a secondary fluid makes that such pumps have no moving parts and are able to work in remote in extreme conditions. Jet pumps main disadvantageous is low efficiency ranging 40% and low pumping height which significantly limits its usage. One of the way to eliminate the low pumping height is to applying second stage of motive fluid. The other way is correct design of motive nozzles. Presented in the paper jet pump is a Liquid Jet Liquid (LJL) class of jet pump which both, motive and secondary fluids are water. This pump is a two stage jet pump with circumferential nozzles which inlet port has diameter approx. 200 mm and is assigned for high flow rate up to 200 m3/h. The main aim undertaken in this paper is to investigate flow phenomena that appears during jet pump operation as well as investigating influence of various design of motive nozzles on value of head pressure. Investigated jet pump is a prototype that was prepared in cooperation between Bergen University College and Fjell Industries AS, Norway. Modelling of jet pump is a complex task and makes difficulties in modelling when using traditional approach therefore to simulate phenomena that appears in jet pump during operation was used CFD tool: Ansys CFX code. Numerical simulations allowed to obtain information about pressure and velocity distribution as well as estimate the head pressure for various design of motive nozzle. There was investigated three design of motive nozzle: standard, with additional circumferential holes and with set of circumferential holes on motive nozzle. Conducted research shown that by modification of motive nozzle is possible to increase pumping height with almost 45%.