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时间:2018-07-20
《船用喷水推进泵装置水力特性数值模拟》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、船用喷水推进泵装置水力特性数值模拟第33卷第5期Vol.33No.5doi:10.3969/j.issn.1674-8530.15.000511121罗灿,成立,刘超,祁卫军,商邑楠(1.扬州大学水利与能源动力工程学院,江苏扬州225009;2.南京市水利规划设计院有限责任公司,江苏南京210006)罗灿通过选取标准k-ε湍流模型,摘要:为了更好地分析喷水推进导叶式混流泵装置的水力特性,采用计算流体动力学分析软件CFX对包括推进泵、进水流道、船底水体和喷嘴在内的船用喷水推进装置在各流量工况下的运行情况进行了数值模拟,分别从流道水力损失分布、装置水力性能、轴
2、向力和内流场特性等方面展开分析.模拟结果表明:流道进口断面到方变圆断面段几何形状较为复杂,水力损失占总损失比重最大,特别是小流量工况,该比重超过了90%,但随着流量的增大,该比重会减小,其余各段水力损失的比重则增加;装置在0.50Qd附近进入水力不稳定0.76Qd~1.10Qd为装置运行的高效区,区,喷水推进泵装置受到的轴向力随着流量的增大而减小;在小流量工况下,叶槽内流态较为复杂,展向涡、径向涡和泄漏涡均较为明显,随着流量的增大,这些涡均逐渐缩小直至消失.———————————————————————————————————————————————关键词
3、:混流泵;船用喷水推进;水力特性;流态中图分类号:S277.9;U664.34文献标志码:A文章编号:1674-8530(2015)05-0374-06LuoCan,ChengLi,LiuChao,etal.Numericalsimulationofperformanceofmarinewaterjetpropulsionsystem[J].JournalofDrainageandIrrigationMachineryEngineering(JDIME),2015,33(5):374-379.(inChinese)Numericalsimulationof
4、performanceofmarinewaterjetpropulsionsystemLuoCan1,ChengLi1,LiuChao1,QiWeijun2,ShangYi'nan1(1.SchoolofHydraulic,EnergyandPowerEngineering,YangzhouUniversity,Yangzhou,Jiangsu225009,China;2.NanjingWaterPlanningandDesigningInstituteCo.Ltd.,Nanjing,Jiangsu210006,China)Abstract:Toa
5、nalysethehydraulicperformanceofthemixed-flowpumpwithvaneddiffuserinawater-jetpropulsionsystemmoreaccurately,CFXcodeisusedtosimulatethesteadyturbulentflowinthesystem,whichconsistsofapump,entryduct,waterbodybelowthevesselandnozzle,atvariousflowratesbymeansofthestandardk-εturbulencem
6、odel.Thehydrauliclossdistribution,———————————————————————————————————————————————hydraulicper-formance,axialthrustandflowfieldfeaturesareexploited.Becausethegeometryofentryductisrela-tivelycomplexwhereitsrectangularsectionattheinletneedstobetransformedintoacircularoneattheoutlet,t
7、hehydrauliclosstakesamaximumproportionintheentryduct,especiallyatalowflowrate.Inthatcase,theproportionexceeds90%.However,thisproportionreduceswithincreasingflowrate,andthehydrauliclossproportionsintheothercomponentsincreaseaccordingly.Thesystemissubjecttothehydraulicinstabilityaro
8、und0.50Qd.Thehighefficiencyzoneex
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