两级中开泵级间隔板对双吸叶轮径向力的影响

发布时间：2018-05-24 10:21

本文选题：两级中开泵 + 双吸叶轮　；参考：《排灌机械工程学报》2017年07期

【摘要】：为研究两级中开泵双吸叶轮所受径向力,基于SST k-ω模型分别对原型泵和加入隔板后的两级中开泵进行数值模拟,获得了泵外特性、螺旋形压水室和双吸叶轮截面上的静压分布及作用在双吸叶轮上的径向力特性.研究结果表明:试验与数值计算外特性曲线趋势一致,表明建立的两级中开泵计算模型是可靠的;级间流道内隔板结构对二级压水室内部的静压影响不大,而双吸叶轮内部静压变化比较明显;隔板对外特性影响比较明显,加入隔板后扬程提高了9%~16%,效率最高增幅约为5%;在一个周期内不同工况下,叶轮所受径向力呈明显的规律性分布,即十角星分布,说明叶轮上径向力矢量分布跟叶轮与蜗壳的动静干涉作用相关;两级中开泵在0.6倍设计工况下径向力最小但不为0,在设计工况下有隔板结构的两级中开泵双吸叶轮所受径向力小于原型泵.
[Abstract]:In order to study the radial force of the double suction impeller of the two stage middle opening pump, the numerical simulation of the prototype pump and the two stage middle open pump after adding the partition is carried out based on the SST k- 蠅 model, and the external characteristics of the pump are obtained. The static pressure distribution on the section of the spiral water chamber and the double suction impeller and the radial force characteristics of the action on the double suction impeller. The results show that the experimental results are consistent with the external characteristic curve of the numerical calculation, which indicates that the calculation model of the two-stage middle opening pump is reliable, and the structure of the inner partition of the interstage flow channel has little effect on the static pressure inside the two-stage water chamber. The internal static pressure of the double suction impeller is more obvious, the external characteristic of the separator is more obvious, the lift of the double suction impeller is increased by 9 / 16 after adding the separator, and the maximum increase of efficiency is about 5. The radial force distribution of impeller is obviously regular, that is, decagonal star distribution, which indicates that the radial force vector distribution on impeller is related to the dynamic and static interference between impeller and volute. The radial force of two stage middle open pump is minimum but not 0 under 0.6 times design condition, and the radial force of double suction impeller of two stage middle open pump with partition structure under design condition is less than that of prototype pump.
【作者单位】：山东双轮股份有限公司;江苏大学国家水泵及系统工程技术研究中心;
【基金】：“十二五”国家科技支撑计划项目(2014BAB08B00) 国家自然科学基金资助项目(51409123) 江苏省自然科学基金资助项目(BK20140554)
【分类号】：TH38

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