Study on the optimum mixing throat length for drive nozzle position of the central jet pump |
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| Authors: | C Prabkeao K Aoki |
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| Institution: | 1. Department of Mechanical Engineering, Faculty of Engineering, King Mongkuts Institute of Technology, Ladkrabang(KMITL), Bangkok, Thailand
2. Department of Mechanical Engineering, School of Engineering, Tokai University, Japan
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| Abstract: | The present paper describes a numerical prediction of optimum mixing throat length for various drive nozzle positions of the
central jet pump. The flow pattern and pressure distribution in the pump for various positions of the drive nozzle are investigated
by three-dimensional numerical analysis using the RNG k-ε turbulent flow model. Numerical analysis was carried out for values
of the nozzle throat ratiod/D of the jet pump of 0.5, 0.6 and 0.7, respectively. The static pressure in the flow field of the jet pump is calculated for
the following conditions: (1) drive nozzle position from the entrance of the throatl /D=0 ∼ 2.0, (2) flow rate ratioM=0∼ 1.2, and (3) Reynolds numberRe=3.6×105. These calculations revealed that (1) the optimum length of the mixing throat forl/D=0∼ 1.0 isLm/D=2.0 ∼ 3.5, (2) the length of the mixing throat forl/D=0 andM=0 (suction flow rate ratio=0) is approximatelyLm/D=3.5, and (3) the maximum efficiency is obtained ford/D=0.6 atl/D=0.5. Moreover, the flow pattern in the mixing throat is clarified through a spark tracing experiment. The results obtained
in the visualization experiment and the numerically obtained mixing length agreed well. |
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