修锉叶片出口对离心泵内流场及叶轮强度的影响

doi:10.3969/j.issn.1674-8530.13.1018

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摘要当离心泵扬程略低于实际需求时,可以通过修锉叶片出口提高其水力性能.文中对单级单吸离心泵叶轮进行修锉,对比修锉前后试验发现,扬程、效率分别提高了9.8%和6.7%.同时采用CFX软件对该泵在设计工况下的全流场进行了非定常数值计算,对比分析了修锉前后内流场的变化.基于ANSYS Workbench平台,对叶轮进行单向流固耦合计算,分析了修锉叶片出口对叶轮强度的影响.结果表明:叶片出口修锉后,出口尾迹区的绝对速度增大且相对速度减小,导致扬程上升;修锉后叶片出口边的逆压力梯度明显减小,阻止了边界层的分离,减少了摩擦和分离损失,从而提高了效率;叶轮最大等效应力与修锉前相比,其差别随着相位的不同而不同;各相位下,修锉后的叶轮最大总变形均大于修锉前.研究结果为改善离心泵内流场提供了一种可靠的方法.

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关键词 ：离心泵, 修锉叶片出口, 单向流固耦合, 内流场, 叶轮强度

Abstract：The performance of centrifugal pumps can be improved through filing blade outlet when the head is slightly lower than the actual demand.After filing the impeller of a single-stage single-suction centrifugal pump, the head and efficiency rise by 9.8% and 6.7% respectively. The unsteady nume-rical simulation of whole flow field of the pump was executed at design condition with CFX software, and the change of the flow field was analyzed. Based on ANSYS Workbench, the one-way fluid-structure interaction of impeller was calculated and the effect of filing blade outlet on impeller strength was analyzed. Results show that, the increase of absolute velocity and the decrease of relative velocity can make the head increased after filing. The adverse pressure gradient on blade outlet edge with filed blades decreases obviously, preventing the separation of boundary layer. The losses of friction and se-paration are decreased, so the efficiency is improved. Impeller maximum equivalent stress changes with the phase after filing blade outlet. But the impeller maximum total deformation is greater than original impeller at every phase.The research provides a reliable method for improving flow field of centrifugal pump.

Key words： centrifugal pump filing blade outlet one-way fluid-structure interaction flow field impeller strength

收稿日期: 2013-11-01

基金资助:

国家自然科学基金资助项目(51079062,51109095,51179075);江苏省自然科学基金资助项目(BK2010346,BA2010155,BY2011140);江苏省工业科技支撑计划项目(BE2012131);江苏省研究生创新计划项目(CXZZ12_0680);江苏大学高级人才科研启动基金资助项目(12JDG082)

通讯作者: 白羽(1989—),男,辽宁葫芦岛人,硕士研究生(yub0429@126.com),主要从事离心泵流场及结构数值分析研究.

作者简介: 刘厚林(1971—),男,江苏溧水人,研究员,博士生导师(liuhoulin@ujs.enu.cn),主要从事水泵现代设计理论与方法研究.

引用本文:

白羽, 刘厚林, 董亮, 刘永付, 王宝勤, 唐晓晨. 修锉叶片出口对离心泵内流场及叶轮强度的影响[J]. 排灌机械工程学报, 2014, 32(10): 852-857. Bai Yu, Liu Houlin, Dong Liang, Liu Yongfu, Wang Baoqin, Tang Xiaochen. Effect of filing blade outlet on centrifugal pump flow field and impeller strength. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(10): 852-857.

链接本文:

http://zzs.ujs.edu.cn/pgjx/CN/10.3969/j.issn.1674-8530.13.1018 或 http://zzs.ujs.edu.cn/pgjx/CN/Y2014/V32/I10/852

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