横风下不同编组长度城际动车组气动载荷规律分析
文档名：横风下不同编组长度城际动车组气动载荷规律分析
摘要：横风是城际动车组运行时产生晃动和不稳定现象的重要原因.为提高城际动车组在横风条件下的运行安全性和稳定性,并找到动车组最优的编组配置,开展城际动车组在横风环境下的气动载荷研究.基于三维、非定常、不可压的DES湍流模型,采用新型城际动车组研究有/无横风环境不同编组长度对列车气动特性的影响,分析城际动车组在高架运行时各节车厢周围流场变化情况,探究城际动车组气动载荷变化规律.研究结果表明:当无横风时,头车和尾车的阻力系数大于中间车,且随着车速的增加头车和尾车的阻力系数基本不变;尾车的升力系数大于头车和中间车,且随着车速的增加头车和尾车的升力系数基本不变.当有横风时,头车的阻力系数反向增大,尾车的阻力系数正向增大,头尾车阻力系数随速度的增大而减小,中间车基本不变;头车升力系数小于尾车和中间车,编组越长,中间车升力系数波动减缓,且随速度的增大而减小.对于侧向力系数,横风使头车侧向力系数最大,中间车次之,尾车最小.编组越长,中间车侧向力系数波动越小;对于倾覆力矩系数,横风使头车倾覆力矩反向最大,中间车次之,尾车最小,随速度的增大而减小.此外,不同编组的城际列车在运行中存在着不同的气动特性,长编组列车在相同条件下具有更好的稳定性和舒适性,且城际动车组车头各种载荷变化波动最大,需要重点关注.研究可为优化列车设计、提高运行安全性和稳定性提供科学依据.在城际动车组设计和编组时,应当优先选择较长编组,以确保列车运行安全和稳定.
Abstract：Crosswindsplayasignificantroleintheswayandinstabilityofoperatingintercityelectricalmultipleunits(EMU)trains.ToimprovethesafetyandstabilityofEMUtrainsanddeterminetheoptimaltrainformation,thispaperintendedtoinvestigatetheaerodynamicloadsonEMUtrainsundercrosswinds.Basedonthethree-dimensionalunsteadyincompressibleDESturbulencemodel,anewintercityEMUtrainwasadoptedtostudytheinfluenceofcharacteristicloadsonthetrainwithdifferentlengthsundercrosswindsorwithoutcrosswinds.Byanalyzingthechangeofflowfieldaroundeachcarriagewhenthetrainisrunningontheviaduct,thevariationlawofaerodynamicloadsonthetrainwasexplored.Theresultsshowthatwithoutcrosswinds,headandtailcarsexperiencehigherdragforcecoefficientscomparedtomiddlecars,withlittlechangeasspeedincreases.Theliftforcecoefficientofthetailcarriageisslightlygreaterthantheheadandmiddlecarriages,andchangedinsignificantlywithincreasingtrainspeed.Withcrosswinds,thedragforcecoefficientoftheheadcarriageincreasesreversely,andthedragforcecoefficientofthetailcarriageincreasespositively.Additionally,theforcecoefficientoftheheadandtailcarriagesdecreaseswithincreasingtrainspeed,whilethemiddlecarriagesremainbasicallyunchanged.Theliftforcecoefficientoftheheadcarriageisslightlysmallerthanthetailandmiddlecarriages.Thelongertheformation,thesmallerthefluctuationintheliftforcecoefficientofthemiddlecarriages,andtheliftforcecoefficientdecreaseswithincreasingtrainspeed.Forthesideforcecoefficient,crosswindscausethelargestsideforcecoefficientontheheadcarriage,followedbythemiddlecarriages,andthesmallestonthetailcarriage.Thelongertheformation,thesmallerthefluctuationinthesideforcecoefficientofthemiddlecarriages.Crosswindscausethelargestoverturningmomentcoefficientinthereversedirectionontheheadcarriage,thenthemiddlecarriages,andfinallythetailcarriage,whichdecreaseswithincreasingspeed.Inaddition,trainswithdifferentformationshavedifferentaerodynamiccharacteristicsduringoperation.Longformationtrainshavebetterstabilityandcomfortunderthesameconditions,andthetrainheadhasthelargestfluctuationinvariousloads,whichneedsspecialattention.Theresearchcanprovidescientificbasisforoptimizingtraindesignandimprovingtheoperationsafetyandstability.InthedesignandformationofintercityEMUtrains,longformationswouldbepreferredtoensuresafeandstabletrainoperation.
作者：黄尊地彭程陈传仰许振国周镇斌伊严严常宁Author：HUANGZundiPENGChengCHENChuanyangXUZhenguoZHOUZhenbinYIYanyanCHANGNing
作者单位：五邑大学轨道交通学院,广东江门529020
刊名：铁道科学与工程学报 ISTICPKU
Journal：JournalofRailwayScienceandEngineering
年，卷(期)：2024, 21(4)
分类号：U266.2
关键词：横风不同编组城际动车组气动特性数值仿真
Keywords：crosswinddifferentgroupintercityEMUaerodynamiccharacteristicsnumericalsimulation
机标分类号：U270.1TE921+.1TB332
在线出版日期：2024年5月17日
基金项目：广东省基础与应用基础研究基金联合基金青年基金资助项目，国家级大学生创新创业训练计划项目横风下不同编组长度城际动车组气动载荷规律分析[
期刊论文]铁道科学与工程学报--2024, 21(4)黄尊地彭程陈传仰许振国周镇斌伊严严常宁横风是城际动车组运行时产生晃动和不稳定现象的重要原因.为提高城际动车组在横风条件下的运行安全性和稳定性,并找到动车组最优的编组配置,开展城际动车组在横风环境下的气动载荷研究.基于三维、非定常、不可压的DES湍流...参考文献和引证文献
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