| 单、双出口双蜗壳泵的压力脉动及径向力特性 |
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| 引用本文： | 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. |
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| 作者姓名： | 蒋跃 李红 刘宜 |
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| 作者单位： | 1.江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013; 2.兰州理工大学能源与动力工程学院, 甘肃 兰州 730050 |
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| 摘 要： | 为研究两种不同双蜗壳型式离心泵的水力特性,采用RNG k-ε湍流模型和滑移网格技术,对单出口双蜗壳及双出口双蜗壳离心泵进行了不同工况下三维非定常湍流数值模拟,得到不同型式双蜗壳泵内压力脉动情况,同时对两种型式泵的径向力进行定常计算对比分析.结果表明:单出口双蜗壳泵内压力脉动高于双出口双蜗壳泵内的压力脉动;在设计工况和非设计工况下,两种型式泵的隔舌及出口处压力脉动的频率均以叶片通过频率为主;在小流量工况下,单出口双蜗壳泵的出口及隔板起始端位置处频率以叶轮转频为主;两种型式双蜗壳离心泵在不同工况下都能有效地平衡径向力,由于单出口双蜗壳泵内存在较为明显的压力脉动,导致其叶轮受到的径向力较大.
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| 关 键 词： | 双蜗壳泵 双出口 单出口 压力脉动 径向力 |
| 收稿时间： | 2013-09-22 |
Pressure fluctuation and radial thrust characteristics in double volute pumps with single and double outlet |
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| Jiang Yue,Li Hong,Liu Yi.Pressure fluctuation and radial thrust characteristics in double volute pumps with single and double outlet[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(9):748-753. |
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| Authors: | Jiang Yue Li Hong Liu Yi |
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| Institution: | 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 |
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| 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. |
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| Keywords: | double volute pump double outlet single outlet pressure fluctuation radial force |
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