| 离心泵小流量工况下的内部流动特性 |
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| 引用本文： | 付燕霞,袁寿其,袁建平,付跃登,黄萍.离心泵小流量工况下的内部流动特性[J].排灌机械工程学报,2014,32(3):185-190. |
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| 作者姓名： | 付燕霞 袁寿其 袁建平 付跃登 黄萍 |
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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.比萨大学土木与工业工程系, 意大利 托斯卡纳大区 比萨 56121; 3.新誉集团有限公司, 江苏 常州 213011 |
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| 摘 要： | 为研究离心泵在小流量工况运行下性能及其内部流动特性,以型号为IS160-50-65的离心泵为研究对象,采用商用化软件Ansys CFX 12.0对模型离心泵的叶轮进口、叶轮流道以及蜗壳流道组成的全流场进行定常数值计算.同时,为了提高数值计算的准确性,考虑采用3种不同的网格数对模型离心泵的扬程进行网格无关性分析.且从离心泵的外特性及其内部流场分析了不同小流量工况下离心泵性能的变化规律.研究结果表明:与试验结果相比,设计工况下,扬程预测偏差为1.47%,效率预测偏差为3.61%;且随着流量降低,计算扬程的偏差值呈一定的下降趋势,计算效率的偏差值逐渐增大.另外,在设计工况下,离心泵的内部流动比较均匀;而在小流量工况下,离心泵进口管道及叶轮流道均出现回流现象,而回流引起的旋涡流有时甚至会堵塞叶轮流道;在极小流量Q/Qd=0.2时,回流区域已延伸至全部的进水管路中.
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| 关 键 词： | 离心泵 小流量工况 流动特性 水力性能 数值模拟 |
| 收稿时间： | 2013-11-14 |
Internal flow characteristics of centrifugal pump at low flow rates |
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| Fu Yanxia,Yuan Shouqi,Yuan Jianping,Fu Yuedeng,Huang Ping.Internal flow characteristics of centrifugal pump at low flow rates[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(3):185-190. |
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| Authors: | Fu Yanxia Yuan Shouqi Yuan Jianping Fu Yuedeng Huang Ping |
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| Institution: | 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Civil and Industrial Engineering Department, University of Pisa, Pisa, Toscana 56121, Italy; 3.New United Group, Changzhou, Jiangsu 213011, China |
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| Abstract: | In order to investigate the performance and internal flow characteristics of centrifugal pump at low flow rates, the type IS160-50-65 end-suction centrifugal pump was selected as computational model. The three-dimensional, steady, turbulent, incompressible fluid flow in the whole pump including a suction pipe, impeller and volute was simulated by means of software Ansys CFX 12.0. Meanwhile the grid independence was checked by employing three sets of mesh to improve the computational accuracy. Finally, both the performance and internal flow characteristics of the pump at low flow rates were analyzed with the mesh just determined. It was shown that the predicted pump head, total efficiency are deviated from the experimental data by 1.47% and 3.61% only under the design condition. As the flow rate is decreased, the predicted head is closer to the tested one to some extent; unfortunately, the estimated efficiency shows increasing disagreement with the experimental value. In addition, the internal flow is quite uniform under the design condition. At low flow rates, however, there is a recirculation in the suction pipe; a reverse flow occurs in the impeller passages as well. The reverse flow is so dominated that it can occupy the entire impeller passages at a certainly low flow rate. At an extreme low flow rate, say 20% design flow rate, the recirculation flow has extended into the whole suction pipe. |
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| Keywords: | centrifugal pump low flow rates flow characteristics hydraulic performances numerical simulation |
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