| 超低比转数多级离心泵水力优化与性能试验 |
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| 引用本文： | 马新华,何勇冠,陆伟刚,蔡朋飞.超低比转数多级离心泵水力优化与性能试验[J].排灌机械工程学报,2016,34(9):755-760. |
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| 作者姓名： | 马新华 何勇冠 陆伟刚 蔡朋飞 |
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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.长沙三昌泵业有限公司, 湖南 长沙 410000 |
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| 摘 要： | 为提高现有超低比转数多级离心泵水力性能,基于ANSYS CFX软件,对多级离心泵内部全流场定常流动进行数值模拟,通过定义叶轮、泵腔、导叶扬程及效率,分别分析叶轮、泵腔、导叶内能量转换与流动损失情况,得到影响多级离心泵性能的主要因素为叶轮与导叶的匹配,次要因素为叶轮内的流动损失.提出取导叶喉部进口绝对速度为叶轮出口绝对速度的1/2计算导叶喉部面积,并逐步优化设计一流道式导叶,通过调整叶片型线消除叶轮流道内旋涡.优化后的叶轮与导叶各处速度变化均匀缓慢,大大降低了流动损失.将性能较优的模型进行制造和测试,测试结果表明,优化后方案的额定工况下扬程提高8.1 m,效率提高3.2%,达到了国家标准,取得了较好的优化效果.将数值模拟结果与试验结果进行对比,分析二者的差异,为进一步优化改进超低比转数多级泵的水力设计方法提供参考.
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| 关 键 词： | 超低比转数多级离心泵 流道式导叶 叶轮 优化设计 |
| 收稿时间： | 2015-06-20 |
Hydraulic optimization and performance test of super low-specific-speed multistage centrifugal pump |
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| MA Xinhua,HE Yongguan,LU Weigang,CAI Pengfei.Hydraulic optimization and performance test of super low-specific-speed multistage centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(9):755-760. |
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| Authors: | MA Xinhua HE Yongguan LU Weigang CAI Pengfei |
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| Institution: | 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Sanchang Pump Co.Ltd., Changsha, Hunan 410000, China |
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| Abstract: | In order to improve the hydraulic performance of existing super low-specific-speed multistage centrifugal pumps, based on ANSYS CFX, the whole flow field of a series of multistage centrifugal pumps is simulated. The energy conversion efficiency and hydraulic loss in the impeller, casing and diffuser are analyzed by defining the head and efficiency for each of them. As a result, the primary factor affecting the performance of the multistage centrifugal pump is identified to be the matching between impeller and diffuser, and the secondary factor is the flow loss in the impeller. It is proposed that the throat area of diffuser should be calculated by making use half magnitude of the absolute velocity at the impeller outlet, the designed diffuser is optimized step by step and the vortex in the impeller is eliminated by adjusting the impeller blade profile. The fluid velocity in the impeller and optimal diffuser varies uniformly and slowly, reducing the flow loss significantly. The optimized pump is manufactured, tested and compared with the original one. It is shown that the head and efficiency are significantly improved by 8.1 m and 3.2%, respectively, meeting the requirements in the national pump standard. The method in which the simulated results are compared with the measurements and then the differences between them are analyzed can provide a reference for hydraulic performance optimization of a super low-specific-speed multistage centrifugal pump. |
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| Keywords: | super low-specific-speed multistage centrifugal pump channel radial guide vane impeller optimization design |
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