偏工况下离心泵蜗舌区流场特性研究  

Characteristics of Flow Field in Tongue Region for Centrifugal Pump under Part-load Condition

作　　者：李学飞[1] 宋宇[2,3,4] 孟根其其格[5] LI Xuefei;SONG Yu;MENG Genqiqige(Baotou Light Industry Vocational Technical College,Baotou 014035,Inner Mongolia,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Collaborative Innovation Center of Advanced Nuclear Energy Technology,Tsinghua University,Beijing 100084,China;Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing100084,China;Inner Mongolia Vocational College of Chemical Engineering,Hohhot 010070,Inner Mongolia,China)

机构地区：[1]包头轻工职业技术学院,内蒙古包头014035 [2]清华大学核能与新能源技术研究院,北京100084 [3]清华大学先进核能技术协同创新中心,北京100084 [4]清华大学先进反应堆工程与安全教育部重点实验室,北京100084 [5]内蒙古化工职业学院,内蒙古呼和浩特010070

出　　处：《水力发电》2019年第4期93-97,共5页Water Power

基　　金：国家自然科学基金项目(51579006);国家自然科学基金项目(51679122);内蒙古自治区高等学校科学研究项目(NJZY17450)

摘　　要：基于Navier-Stokes方程和SST k-ω湍流模型,对离心泵内部流动进行数值模拟,分析离心泵蜗舌区瞬态流动特性。计算所得扬程和效率与试验结果吻合较好,模拟方法可行。结果表明:不同流量下,蜗舌区压力脉动的主要影响因素是动静干涉作用,压力脉动主频均为叶频及其倍频;小流量时,压力脉动幅值随流量的减小而增加,压力脉动低频段出现一些复杂激励频率,流量降至0. 4Qd时,甚至出现1/5fr(叶轮转频);设计流量时压力脉动最大幅值在蜗舌端处最大,失速状态下在蜗舌靠近叶轮出口处最大,其值约为设计流量时的4. 9倍,是由此处随时间剧烈变化的旋涡引起。The unsteady flow in a centrifugal pump is numerically simulated by using Navier-Stokes equations and SST k-ω turbulence model.The calculation results are in good agreement with experimental results.Under the condition of different flow rate,the major source of volute tongue region pressure fluctuation is rotor-stator interactions,and the dominant frequency of pressure fluctuation is blade pass frequency and its harmonic frequency.Under the condition of low flow rate,the amplitude of pressure fluctuation increases with the decrease of flow rate and several complex frequencies are found in low frequency band of pressure spectrum.When the flow rate drops to 0.4 Q d,even 1/5 blade pass frequency appears.Under the condition of design flow rate,the maximum amplitude of pressure fluctuation appears at tongue tip.Under the condition of stall,the maximum amplitude appears at impeller outlet near the tongue with a value being about 4.9 times to that under the condition of design flow rate,which is caused by vortex evolving with time.

关 键 词：离心泵 中比转速 蜗舌区 压力脉动 瞬态流线分布 

分 类 号：TH311[机械工程—机械制造及自动化]