排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (4): 295-300    DOI: 10.3969/j.issn.1674-8530.15.0190
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叶轮前盖板与泵体轴向间隙对轴向力的影响
李彩虹1, 薛志宽2, 李红2
1.西安泵阀总厂有限公司, 陕西, 西安 710025; 2.江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江212013
Effects of axial clearances between impeller front shroud and pump body on axial force
LI Caihong1, XUE Zhikuan2, LI Hong2
1.Xi′an Valve Factory Co.Ltd., Xi′an, Shaanxi, 710025, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 为了研究一种新型结构的离心泵叶轮前盖板与泵体轴向间隙对轴向力的影响,首先采用传统理论计算方法得到泵的轴向力,然后基于CFX软件,采用RNG k-ε湍流模型和高阶算法,对离心泵进行全流场数值模拟.通过改变叶轮前盖板与泵体轴向间隙方法,获得泵设计工况下的外特性、轴向间隙之间静压变化及转子部件轴向力,研究泵外特性、轴向力随叶轮前盖板与泵体轴向间隙的变化情况和变化规律.通过数值模拟计算研究表明:在设计工况下,随着离心泵叶轮前盖板与泵体间隙的增加,泵的扬程和效率逐渐减小;叶轮、背叶轮和副叶轮内的静压变化很小,叶轮前盖板与泵体轴向间隙内的静压变化明显;泵的轴向力先增大后减小.扬程数值模拟和试验结果误差为0.84%,轴向力理论计算和数值模拟的最大误差不超过5.75%,说明数值模拟的方法验证了用经验公式计算新型泵所受轴向力的准确性.
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李彩虹
薛志宽
李红
关键词轴向力   离心泵   轴向间隙   水力性能   数值模拟     
Abstract: In order to study the influence of axial clearance between the front cover plate and the pump body on the axial force,traditional theoretical calculation method was used to obtain the axial force of the pump first, then based on CFX software, RNG k-ε turbulent model and high order algorithm were used to perform numerical simulations for the whole flow field of centrifugal pump. The external cha-racteristics of the pump, static pressure variation between the axial clearance and the axial force of the rotor components were obtained by changing the axial clearance between the impeller front shroud and the pump body. The effects of axial clearance on the hydraulic performance and the axial force of the impeller were analyzed. Through the numerical simulation, it was found that the head and the efficiency of the pump decrease gradually with the increasing of the clearance between the impeller front shroud and the pump body; the static pressure in the impeller and the auxiliary impeller changes a little, and the static pressure changing in the clearance between front cover plate and the pump body is obvious;the axial force of the pump increases first and then decreases with the increase of the clearance between the impeller front shroud and the pump body.The error ratio of the head between numerical simulation result and experiment is 0.84% and the maximum error ratio of the axial force between theo-retical calculation result and numerical simulation is 5.75%.The numerical simulation method verified the accuracy of the axial force of the new type pump by the empirical formula.
Key wordsaxial force   centrifugal pump   axial clearance   hydraulic performance   numerical simulation   
收稿日期: 2015-08-28;
基金资助:国家自然科学基金资助项目(5127906)
通讯作者: 薛志宽(1989—),男,甘肃庆阳人,硕士研究生(xuezhikuan@126.com),主要从事现代流体机械(泵)设计理论及方法研究.   
作者简介: 李彩红(1966—),女,河南温县人,高级工程师(lchzy666@126.com),主要从事泵阀的研发和生产工作.
引用本文:   
李彩虹,薛志宽,李红. 叶轮前盖板与泵体轴向间隙对轴向力的影响[J]. 排灌机械工程学报, 2016, 34(4): 295-300.
LI Cai-Hong-,XUE Zhi-Kuan-,LI Hong-. Effects of axial clearances between impeller front shroud and pump body on axial force[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(4): 295-300.
 
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