文章摘要
叶长亮,王福军,李怀成,李震昙,宋青松.高扬程两级双吸离心泵时序效应研究[J].水利学报,2018,49(7):858-868,876
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
投稿时间:2017-09-30  
DOI:10.13243/j.cnki.slxb.20170959
中文关键词: 高扬程  两级双吸离心泵  时序效应  压力脉动  径向力
英文关键词: high head  two-stage double-suction centrifugal pump  clocking effect  pressure fluctuation  ra-dial force
基金项目: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)
作者单位E-mail
叶长亮 中国农业大学 水利与土木工程学院, 北京 100083  
王福军 中国农业大学 水利与土木工程学院, 北京 100083
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 
wangfj@cau.edu.cn 
李怀成 上海连成集团有限公司, 上海 201812  
李震昙 上海连成集团有限公司, 上海 201812  
宋青松 上海连成集团有限公司, 上海 201812  
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中文摘要:
      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。
英文摘要:
      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°,30ånd 45° between the two stage impellers which have six blades are de-signed. The influence of clocking effect on the unsteady pressure fluctuation in the pump and on the radial force 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 great influence on both the pressure fluctuation and the unsteady radial force imposed on the impeller. For the 30° 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 pressure pulsation 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 the 30° 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 head multi-stage centrifugal pumps.
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