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| Numerical simulation for influence of throat length on annular jet pump performance |
| Long Xinping, Yan Hengfei, Zhang Songyan, Yao Xin |
| (School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China) |
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Abstract The flow inside an annular jet pump was investigated numerically by Fluent based on finite volume method and Realizable k-ε turbulent model, and the reliability of calculations was examined and validated. From the flow field of the jet pump, the expansion and mixing of two streams in the annular jet pump exist in both throat pipe and diffuser. The development of jet flow and wall pressure distribution under different length of the throat pipe was discussed and the effect of throat length on performance and efficiency of annular jet pump was also compared and analyzed. The results show that the throat length has some influence on the expanding of jet flow inside the throat, as well as the performance and efficiency of annular jet pump. The longer throat length, the better expanding and mixability of jet, but over-long throat length will result in more friction loss. According to the principle of best efficiency, the range of throat length is =2.17～2.89, and when the throat length is 2.69 times of throat diameter, the efficiency achieves its maximum value of 35.6％.
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Received: 30 June 2009
Published: 30 May 2010
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