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ID:37960260
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页数:5页
时间:2019-06-03
《单-双蜗壳泵隔舌区压力脉动及径向力特性分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第4O卷第4期兰州理工大学学报Vo1.40No.42014年8月Journ~ofLanzhouUniversityofTechnologyAug.2014文章编号:1673-5196(2014)04-0051-O5单一双蜗壳泵隔舌区压力脉动及径向力特性分析刘宜,梁润东,蒋跃,郭苗(兰州理工大学能源与动力工程学院,甘肃兰州730050)摘要:为揭示单一双蜗壳离心泵的不同水力特性,应用商业软件FLUENT,采用RNGk-e湍流模型和滑移网格技术,对单一双蜗壳双吸离心泵进行不同工况下三维非定常湍流数值模拟,得到不同蜗壳隔舌区计算点的压力脉动情况,并对其进行频域
2、分析.结果表明:单蜗壳离心泵在设计工况及大流量工况下,压力脉动频率以叶片通过频率为主;在小流量工况下,压力脉动频率以低于1倍叶片通过频率为主,在0.6倍设计流量工况下,其压力脉动最大幅值约为设计工况下1.13倍.双蜗壳离心泵在小流量、设计流量及大流量工况下,压力脉动频率均以叶片通过频率为主,在0.6、0.8和1.2倍设计工况下,其压力脉动最大幅值分别约为设计工况的6.59、3.12和4.55倍.相比较于单蜗壳泵,双蜗壳泵能有效地平衡径向力,在偏离设计工况下径向力变化不大.关键词:双吸离心泵;单蜗壳;双蜗壳;压力脉动;径向力·中图分类号:TH311文献标识
3、码:APressurefluctuationnearvolutetongueandanalysisofradialforcecharacteristicsofsingleanddoublevolutepumpsLIUYi,IAANGRun-dong,JIANGYue,GUOMiao(CollegeofEnergyandPowerEn~gineefing,LanzhouUniv.ofTeeh.,Lanzhou730050,China)Abstract:Inordertorevealthedifferenceofhydrauliccharacteristic
4、sbetweensingleanddoublevolutecentrifugalpumps,theirthree-dimensionalnon-stationaryturbulentflowwasnumericallysimulatedwithcommercia1softwareFLUENT。RNGturbulencemodel,andslidingmeshtechnologyunderdifferentoperationalconditions.Thepressurefluctuationnearvolutetonguewasobtainedandth
5、efrequencyspectraatcorrespondingmonitoringpointfordifferentvoluteswereanalyzed.Theresultsshowedthatthebladepassingfrequencydominatedthepressurefluctuationsnearthevolutetongueunderdesignandlargeflowrateconditionforsinglevolutecentrifugalpump.Undersmallflowratecondition,thefrequenc
6、ylessthanthebladepassingfrequencybecamedominativeinthepressurefluctuations.Underconditionof60de—signflowrate,themaximumpressurefluctuationamplitudewasabout1.13timeslargertitantheampli—tudeatdesignflowrate.Forthedoublevolutepumpthebladepassingfrequencydominatedthepressurefluctuati
7、onsnearthevolutetongueunderconditionsofdesignandoff-designflowrate.Underconditionsof60,8Oand120designflowrate,thepressurefluctuationamplitudeswererespectively6.59,3.12and4.55timeslargerthantheamplitudeatdesignflowrate.Comparedwiththesinglevolutepump,thedoublevolutepumpexhibitedth
8、eabilitytobalanceeffectivelytheradialfor
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