隔板起始位置对大型双蜗壳双吸泵径向力和压力脉动的影响  

Influences of rib start point in large double-volute double-suction pumps on the radial force and pressure fluctuation

作　　者：牛茂升 朱强 芦洪钟 肖功槐 蔡婷 Niu Maosheng;Zhu Qiang;Lu Hongzhong;Xiao Gonghuai;Cai Ting(Shanghai KaiQuan Pump(Group)CO.,LTD.,Shanghai,201801,China)

机构地区：[1]上海凯泉泵业(集团)有限公司,上海201801

出　　处：《农业工程学报》2021年第12期20-27,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51076136)。

摘　　要：为研究双蜗壳泵内压力脉动情况,该研究以某大型双蜗壳双吸泵为研究对象,通过三维非定常计算对不同隔板起始位置对水力性能、叶轮径向力、蜗壳内各点压力脉动的影响进行研究。研究结果表明,采用双蜗壳结构后,设计点效率下降4%~5%;径向力大小在叶轮旋转过程中呈周期性变化,径向力大小受隔板起始位置影响较大,因此需要合理布置隔板起始位置;隔舌附近各点压力分布均呈现明显的周期性波动变化,隔舌后测点压力峰值、平均值及脉动值要远小于隔舌前测点,仅为隔舌前测点相应值的25%~50%,而且随着隔板起始位置后移,隔舌附近各点压力波动逐渐减弱;综合考虑水力性能及压力脉动影响,隔板起始点应布置于自隔舌点以叶轮中心为圆心向蜗壳出口方向旋转200°位置,该结构下水力效率最高,径向力最小,研究结果可以为大型双蜗壳双吸泵水力性能改进及结构优化提供一定的理论支持。Vibration has been an ever-increasing demand for the operational stability of centrifugal pumps in recent years,especially in most large pumps in modern industry.The internal flows are generally dominated by the characteristics of operation stability and vibration of centrifugal pumps.Nevertheless,the blade and volute structures are dramatically detrimental to the internal flows.The radial force is one of the most significant factors to affect the operation stability,and the pressure pulsation inside the volute,particularly in the tongue areas.A double-volute structure is selected normally to reduce the radial force in commonly-used large pumps,instead of a single-volute structure.But the specific structures are still required to be optimized,such as the arrangement of the rib start point.In this study,a three-dimensional unsteady dynamic was proposed to clarify the influences of rib start point on the hydraulic performance,radial force,and pressure fluctuation in the volute of a large double-volute double-suction pump.The variation of fluctuation amplitude and frequency of radial forces were considered at the different rib start points.Meanwhile,the radial forces of the double-volute pump at various flow rates were also compared with those of the single-volute pump.The experiments of pump performance(head,efficiency,and power)were performed on the large-scale pump platform in KaiQuan Factory in Shanghai of China.The numerical data agreed well with the experiments,same as the grid independence check.The results indicated that the hydraulic efficiency at the design points decreased about 4%-5%in the double-volute structure,compared with the single-volute structure.Periodic variation of radial force was detected in the test,where the blade passing frequency was dominated during a blade revolution.The angle of radial force was also changed periodically.The rib start point significantly determined the radial force,where the minimum appeared when the rib started from 190°and 200°,whereas,the maximum appeared when th

关 键 词：泵 试验 隔板位置 双蜗壳泵 径向力 压力脉动 

分 类 号：TH311[机械工程—机械制造及自动化]