摘要
采用SSTk-ω湍流模型分析半高导叶叶高对离心泵水力性能与压力脉动强度的影响,研讨半高导叶对其性能的影响规律。结果表明,小流量工况时,导叶叶高对离心泵水力性能影响较小,随着流量增大,其影响越明显。随着流量增加,离心泵扬程与效率随着导叶叶高降低而增大,高效区变宽,并向大流量偏移。各流量工况下,导叶叶高对叶轮做功影响较小,而对导叶与蜗壳内总压损失影响较大,随着流量增加,导叶叶高降低明显减小导叶与蜗壳内总压损失。在各流量工况时,叶轮、导叶与蜗壳内压力脉动强度随着导叶叶高降低而逐渐降低。
The SST k-ωwas adopted to analyse the impacts of half guide blade height on hydraulic performance and pressure fluctuation intensity of centrifugal pump.The influence law of semi-high guide vanes on the pump’s performance was discussed.The results show that blade height has little influence on pump's hydraulic performance,and the influence becomes more obvious with the increase of flow rate.With the increase of flow rate the head and efficiency of pump increase with the decrease of the guide blade height,and turbine will perform a wider efficiency range which also shifts towards higher flow rate.In each flow condition,the guide blade height has little influence on the impeller’s work capacity,but has great influence on the total pressure loss in guide blade and volute.In each flow condition,the pressure fluctuation intensity in the impeller,guide vane and volute all decrease with reducing guide blade height.
作者
付玉壮
邓晓琴
陈小伟
江伟
FU Yuzhuang;DENG Xiaoqin;CHEN Xiaowei;JIANG Wei(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China)
出处
《水利与建筑工程学报》
2020年第6期88-94,共7页
Journal of Water Resources and Architectural Engineering
基金
大学生创新创业训练计划(S201910712209)
国家自然科学基金项目(51809218)
陕西水利科技计划项目(2017slkj-5)。
关键词
半高导叶
水力性能
压力脉动强度
数值模拟
semi-high guide vane
hydraulic performance
pressure fluctuation intensity
numerical simulation
