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| Structure optimization of annular jet pumps |
| Zeng Qinglong1,2, Long Xinping1,2, Xiao Longzhou1,2, Lü Qiao1,2 |
| 1.School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China; 2.Key Laboratory of Hubei Pro-vince for Water Jet Theory & New Technology, Wuhan, Hubei 430072, China |
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Abstract With the method of DOE(the design of experiment method)and CFD, the optimum structure parameters combination of an annular jet pump(AJP)was mainly investigated for the maximum efficiency. The AJP model designed by previous researchers, with the area ratio 1.75, was adopted as the simulation prototype. The experimental data of the performance were used to validate the simulation results. Based on DOE, four main factors, namely the flow ratio q, the relative throat length lt, the included angles of the suction chamber α and the diffusion angle in diffuser β, were selected for the optimization of the efficiency, and series of experiments were carried out to study the inner flow of pump with different structure parameters combination. Then, the significance of structural parameters to the AJP performance was ascertained and the optimum structure parameters combination was obtained by means of statistic software package. The results confirmed the availability and effectiveness of the method that the maximum efficiency 36.3% from DOE is nearly the same with the corresponding results 35.8% from CFD. Moreover, among all the main structural parameters impacting on AJP performance, the influence of the relative throat length is considerably greater than that of the included angle of the suction chamber and the diffusion angle in diffuser. It can be concluded that the effects of two-factor interactions are more significant than that of one factor acting alone. The basis for the further optimization and determination of reasonable working range of AJP is provided.
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Received: 22 October 2012
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