資源描述:
《橋梁擋風(fēng)屏基本單元多孔介質(zhì)模型數(shù)值建模.pdf》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第l3卷第1期鐵道科學(xué)與工程學(xué)報(bào)Volume13Numberl2016年1月JournalofRailwayScienceandEngineeringJanua~2016橋梁擋風(fēng)屏基本單元多子L介質(zhì)模型數(shù)值建模張成玉,陳曉麗,許建林。梅元貴衛(wèi)(1.蘭州交通大學(xué)機(jī)電工程學(xué)院,甘肅蘭州730070;2.甘肅省軌道交通力學(xué)應(yīng)用工程實(shí)驗(yàn)室,甘肅蘭州730070)摘要:基于橋梁擋風(fēng)屏的基本開孔單元,采用基于有限體積方法的軟件數(shù)值求解其周圍的三維常物性定常不可壓縮湍流流動,統(tǒng)計(jì)風(fēng)速變化情況下?lián)躏L(fēng)屏前后緩變流動截面上的壓差,得到壓差一風(fēng)速特性曲線和多孔介質(zhì)模型的黏性阻尼系數(shù)
2、、慣性阻尼系數(shù),研究結(jié)果表明:開孔率20%和10%擋風(fēng)屏的黏性阻尼系數(shù)與慣性阻尼系數(shù),隨著風(fēng)速的增大,也隨之增加,2種開孔路擋風(fēng)屏的黏性阻尼系數(shù)與慣性阻尼系數(shù)范圍在9.46~16.58,5.20~9.10;38.94—55.65,67.34—96.2,可為以后相關(guān)研究提供基礎(chǔ)參考數(shù)據(jù)。關(guān)鍵詞:擋風(fēng)屏;多孔介質(zhì)模型;數(shù)值模擬;黏性阻尼系數(shù);慣性阻尼系數(shù)中圖分類號:U464.134.4文獻(xiàn)標(biāo)志碼:A文章編號:1672—7029(2016)Ol—Ol17—08Anumericalporousmediamodelingofthebasicpolyporousunito
3、fwindbreakbarriersconstructedonbridgesZHANGChengyu,CHENXiaoli,XUJiantin,MEIYuangui,(1.SchoolofMechatronieEngineering,LanzhouJiaotongUniversity,Lanzhou730070,China;2.MechanicsApplicationEngineeringofFafficsafetyonTrackinGansy,Lanzhou730070,China)Abstract:Inordertoobtaintheviscousresi
4、stanceandinertialresistanceofthewindbreakbarriers,numeriealsimulationofbasicpolyporousunitofthemwerecarriedoutbyusingacomputationalfluiddynamics(CFD)codebasedonthefinitevolumemethod(FVM).Thegoverningequationsofthreedimensional,steadyandincom—pressibleturbulentflowofairwithconstantth
5、ermalpropertiesweresolved.Theairpressuredropwascalculatedbypickingtwosectionsinslowflowdomains,Thenthefittingcurveofpressuredropserialstovelocitiesweredrawnbyalteringtheincomingvelocityofairflowandtheresistancecoefficientsofporousbafflewereextracted.Theresearchindicate:withthewindin
6、creases,theviscousresistance,inertialresistanceofthetwokindsofwindbreakbarriers(openingratio20%,10%)willincreaseaccordingly.Theviscousresistanceandinertialre.sistanceofthetwokindsofwindbreakbarriersrangefrom一9.46~16.58,5.20~9.10and38.94—55.65,67.34~96.2.respectively.Thedatacanbeused
7、infuturenumericalstudyrelatedtowindbreakbariers.Keywords:windbreakbarier;porousmediabaffle;numericalsimulation;viscousresistance;inertialresistance收稿日期:2015一O6—19基金項(xiàng)目:中國鐵路總公司科研實(shí)驗(yàn)項(xiàng)目(2014034)通訊作者:梅元貴(1964一),男.河南滎陽人,教授,博士,從事列車空氣動力學(xué)研究;E—mail:meiyuangui@163.eom第1期張成玉,等:橋梁擋風(fēng)屏基本單元多孔介質(zhì)模型數(shù)值建
8、模1233.3.3數(shù)據(jù)擬合公式(a)根