高扬程两级双吸离心泵时序效应研究  

Investigation on the clocking effect of a double-entry two-stage double suction centrifugal pump with high head

作　　者：叶长亮[1] 王福军[1,2] 李怀成 李震昙 宋青松 YE Changliang;WANG Fujun;LI Huaicheng;LI Zhentan;SONG Qingsong(College of Water Resources ＆ Civil Engineering,China Agricultural University,Beijing 100083,China;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System in China Agricultural University,Beijing 100083,China;ShanghaiLianchengGroupCompany,Shanghai 201812,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]北京市供水管网系统安全与节能工程技术研究中心,北京100083 [3]上海连成集团有限公司,上海201812

出　　处：《水利学报》2018年第7期858-868,876,共12页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(51779258);"十二五"国家科技支撑计划项目(2015BAD20B01)

摘　　要：因叶轮与导叶的周向相对位置变化而产生的时序效应对水泵性能有直接影响。本文针对一台两级叶轮均为6叶片的双进口两级双吸离心泵首级叶轮、过渡流道和第二级叶轮所组成的相位分别为0°、15°、30°及45°等4种方案,对0.6Q、1.0Q及1.2Q等3种典型工况下的水泵瞬态特性进行了研究,分析了过流部件压力脉动频域特征,总结了压力脉动及叶轮径向力变化规律。研究表明:两级双吸离心泵叶轮相位对水泵扬程及效率的影响不显著,偏差在2%以内,但相位对水泵过渡流道和压水室压力脉动影响大,在设计工况下,相对于0°、15°及45°方案,30°方案对过渡流道入口隔舌处压力脉动主频幅值削减度分别达70%、38%和40%;对压水室隔舌处压力脉动主频幅值削减度分别达31%、18%和22%。4种方案对应的离心泵叶轮径向力在各工况下均呈周期性变化,且30°方案下叶轮所受到径向力最小。为保证水泵安全稳定运行,建议两级双吸离心泵首级叶轮与第二级叶轮在圆周向呈对称交错安装。本文研究成果为高扬程多级离心泵的优化设计和稳定运行提供了科学依据。The clocking effect caused by the relative position between impeller and diffuser vane has great effect on the performance of a pump. The clocking effect of a double-entry two-stage double suction centrif-ugal pump which is often used in the Yellow River Diversion Project is investigated. Four schemes with rel-ative installation angle 0°,15°,30°and 45° between the two stage impellers which have six blades are designed. The influence of clocking effect on the unsteady pressure fluctuation in the pump and on the radialforce of impeller at three typical conditions is investigated. The results show that the clocking effect has lit-tle influence on the head and efficiency whose discrepancy is less than 2%. The clocking effect has greatinfluence on both the pressure fluctuation and the unsteady radial force imposed on the impeller. For the30° scheme, the pressure fluctuation amplitude of inter-stage flow channel tongue is reduced by 70%,38% and 40% respectively compared with 0°,15° and 45° schemes at design condition,and the pressurepulsation amplitude of the volute tongue is reduced by 31%,18% and 22%. The radial force of the impel-ler varies periodically at three typical conditions. The radial force of the impeller is the smallest for the30° scheme. Thus,it is suggested that the relative position between the impellers of two-stage double suc-tion centrifugal pump should be installed circumferential symmetric staggered to obtain better performance.The research results provide a scientific basis for the optimal design and stable operation for the high headmulti-stage centrifugal pumps.

关 键 词：高扬程 两级双吸离心泵 时序效应 压力脉动 径向力 

分 类 号：TU991.35[建筑科学—市政工程]