Pressure fluctuation and radial thrust characteristics in double volute pumps with single and double outlet
Jiang Yue1, Li Hong1, Liu Yi2
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.School of Energy and Power Enginee-ring, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Abstract：In order to study the internal flow field in double volute pumps with different types of outlet, the three-dimensional, unsteady turbulent flows in a double volute pump with single and double outlet are simulated under various operational conditions by making use of the RNG k-ε turbulence model and sliding mesh technique. The pressure fluctuation and the corresponding frequency spectra at a few monitoring points are obtained as well. It is revealed that the pressure fluctuations in the double volute with single outlet are larger than those in the double volute with double outlet. The blade passing frequency dominates in the pressure fluctuations on the volute tongue and at the outlet under the design and off-design conditions for two volutes. At low flow rates, however, the impeller rotational frequency becomes dominant in the pressure fluctuations on the rib tip and at the volute outlet for the pump with single outlet. Two kinds of double volute can eliminate the radial thrust under different flow rates effectively, but the impeller in the double volute with single outlet is subject to a larger radial thrust because of a significant pressure fluctuation in that volute.
蒋跃, 李红, 刘宜. 单、双出口双蜗壳泵的压力脉动及径向力特性[J]. 排灌机械工程学报, 2014, 32(9): 748-753.
Jiang Yue, Li Hong, Liu Yi. Pressure fluctuation and radial thrust characteristics in double volute pumps with single and double outlet. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(9): 748-753.
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