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时间:2020-03-28
《平板表面脊状结构对局部湍流特性的影响研究.pdf》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43卷第5期华北电力大学学报Vo1.43.No.52016年9月JournalofNorthChinaElectricPowerUniversitySep.,2016doi:10.3969/j.ISSN.1007—2691.2016.05.11平板表面脊状结构对局盘日p,向流特性的影响研究王松岭,邓宇涵,吴正人,李子骏,郝晓飞(华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003)摘要:利用Fluent软件,通过脊状平板表面数值模拟,分析黏性阻力、压差阻力、壁面切应力、湍流特性等在脊状平板表面中分布规律,基于能量耗散分析,为脊状
2、结构尺寸选取和局部区域改造提供参考依据。结果表明:脊状尺寸越大越有利于黏性阻力减小.但会导致压差阻力增加,而脊状结构压差阻力主要由迎风面与间隔交接处附近高压区决定。高壁面剪切应力集中于相邻沟槽之间区域前段,且脊状结构越小。光滑表面大于脊状结构内壁面剪切应力的区域也相对越多。对脊状结构平板近壁区涡量与湍流特性分析发现,沟槽最底端部分流体是近乎静止的,脊状结构表面涡量与湍流强度均小于光滑表面,而在脊状结构沟槽内所形成的旋涡区域,能量耗散开始大于光滑表面。关键词:脊状结构;数值模拟;分布规律;减阻;优化中图分类号:TH4;0355文献标识码:A文章编号:1
3、007—2691(2016)05—0068—07StudyonInfluenceofRibletStructureofFlatSurfaceonLocalTurbulenceCharacteristicsWANGSongling,DENGYuhan,WUZhengren,LIZijun,HAOXiaofei(KeyLaboratoryofConditionMonitoringandControlforPowerPlantEquipment,NoahChinaElectricPowerUniversity,Baoding071003,China)Abs
4、tract:Thispaperanalyzesthedistributionlawofviscousresistance,pressuredifferenceresistance,wallshearstressandturbulencecharacteristicsontheribletflatsurfacebyusingFluenttomakenumericalsimulationoftheribletflatsurface.Theenergydissipationisanalyzedandreferencesforsizeselectionand
5、localtransformationofribletstruc—tureisprovided.Resultsshowthatagreaterribletstructurewillleadtosmallerviscousresistanceandlargerpressuredifferenceresistance;however,thepressuredifferenceresistanceofribletstructuremainlydependsonthewindwardsideandhighpressureareanearthejunction
6、.Thebiggestwallshearstressliesinthefrontintervalareaoftheribletstructure,anditishigherthanthatofasmoothsurfacemodelatthesameplace.Insidetheridgestructure,mostwallshearstressislowerthanthatofasmoothsurface.Thesmallerridgestructurewillleadtoasmallerareawherethewallshearstressinsi
7、detheridgestructureissmallerthanthatofthesmoothsurface.Bytheanalysisofvorticityandturbu—lentcharacteristicsinthenearwallregion,thepaperfindsthatthefluidinthebottomofthegrooveisnearlystationary,thesurfacevorticityandturbulenceintensityoftheribletstructurearesmallerthanthatofthes
8、moothsurface,andinthevo~exareawithinthegrooveribletstr
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