叶片交错布置对双吸离心泵外特性的影响
宋冬梅1，费宇1，赖喜德2，刘雪垠1，杜波1
（1.四川省机械研究设计院，四川 成都 610063；2.西华大学 能源与环境学院，四川 成都 610039）
摘要：基于RANS方程、修正后的RNG湍流模型和壁面函数法，采用CFX软件分别对交错布置和对称布置叶片的高转速低比转速双吸离心泵进行了流场为三维不可压缩湍流流场的数值模拟，计算得到了各自的性能曲线以及叶片和蜗壳内的压力和速度分布。通过对比分析可知，采用交错布置叶片能有效降低泵的轴功率，且在设计工况和大流量工况提高泵的效率，能明显改善蜗壳内部流动特性，有效减小泵内气蚀的严重程度，增强离心泵的运行稳定性。
关键词：双吸离心泵；交错布置叶片；外特性；内部流场
中图分类号：TH311 文献标志码：A doi：10.3969/j.issn.1006-0316.2014.07.007
文章编号：1006－0316 (2014) 07－0026－06
Effects of the staggered blades on the performance of double-suction centrifugal pump
SONG Dong-mei1，FEI Yu1，LAI Xi-de2，LIU Xue-yin1，DU Bo1
( 1.Sichuan Machinery Research & Design Institute, Chengdu 610063, China; 2.School of Energy and Environment, Xihua University, Chengdu 610039, China )
Abstract：Based on RANS equations, the amended RNG k－ε turbulent mode and wall function, two double-suction centrifugal pumps work at high rotational speed and low specific speed were simulated by CFX. Two pumps were different at the blade set. One of them is staggered blades, while the other set is symmetrical blades. The fluid is assumed as three-dimensional incompressible turbulent flow. The characteristic performance curves of two pumps were predicted according to the calculated results, as well as the pressure and velocity distributions in the impeller and volute. It is shown that the staggered blades effectively reduced the shaft power of pump, enhanced the efficiency under designed and large flow rate conditions, improved the flow characteristic of the volute, reduced the severity of cavitation and improved the operation operability of the pump.
Key words：double-suction centrifugal pump；staggered blades；characteristic performance；flow field
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收稿日期：2013－12－17
作者简介：宋冬梅（1986－），女，四川乐山人，硕士研究生，助理工程师，主要从事流体机械数字化设计理论与制造技术工作；赖喜德（1962－），男，四川绵阳人，博士，教授，主要研究方向为流体机械及工程、水电动力工程。
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