DSM重介质旋流器流场的数值模拟第31卷第5期____年10月煤炭学报JOURNALOFCHINACOALSOCIETYVol.31No.5Oct.____文章编号:0253-9993(____)05-0627-04DSM重介质旋流器流场的数值模拟刘峰1,2,钱爱军,郭秀军22(11中国矿业大学(北京)化学与环境工程学院,北京100083;21煤炭科学研究总院唐山分院,河北唐山063012)摘要:采用计算流体力学软件,选用RSM湍流数值计算模型,对DSM型重介质旋流器的流场进行了数值模拟.研究了DSM型重介质旋流器流场的速度分布、密度分布和压力分布,得出4点结论:旋流器内的流体沿着溢流管的外侧向下流动,使旋流器分选时存在短路流,降低了旋流器的分选效率.旋流器内的轴向速度越接近中心越高,大约在旋流器半径的中部通过零点,所有速度为零的个点形成了零轴速包络面(LZVV).,在空气柱附近达到最大值,然后逐步下降到最低点.由于回流的作用,了空气柱,空气柱截面直径大约为溢流口直径的016.关键词:DSM重介质旋流器;速度场分布;中图分类号:TD92217文献标识码:NumericalsimiintheDSMheavymediumcycloneLIU,QIANAi2jun,GUO_iu2junBranch,ChinaCoalResearchInstitute,Tangshan063012,China)1,222(11SchoolofChemicalentalEngineering,ChinaUniversityofMiningandTechnology(Beijing),Beijing100083,China;21TangshanAbstract:ThenumericalsimulationwasmadetotheflowfieldintheDSMheavymediumcyclonebyusingthesoftwareofCFD(computationalfluiddynamics)andRSM(ReynoldsStressModel)oftheturbulentflow.What’smore,thevelocitydistribution,densitydistributionandpressuredistributionoftheflowfieldintheDSMheavyme2diumcyclonewerestudiedaswell,thusfollowingfourconclusionswerereached:thefluidinthecycloneflowsdownwardsalongoutsideoftheoverflowpipe,andshirt2circuitflowoccursduringtheseparation,thusreducingtheseparationefficiencyofthecyclone.Thea_ialvelocityinthecyclonebecomesquickertothecentreandgoesthroughthezeropointappro_imatelyinthemiddleofradiusofthecyclone,thusallthepointswherevelocitiesarezeroformthezero2a_ialvelocityenvelopeplane(LZVV).Thetangentialvelocityinthecycloneimprovesgraduallyfrominsidetooutsideandreachesthema_imumclosetotheaircolumnandthenreducesstepbystepuntiltotheminimum.Duetoeffectofthereturnflow,anegativepressurezoneformsinthemiddleofthecycloneandtheaircolumnwhosesectionaldiameterisabout016timesofthediameteroftheoverflowoutletoccurshere.Keywords:DSMheavymediumcyclone;velocityfielddistribution;pressurefielddistribution;densityfielddis2tribution选煤用的重介质旋流器是在分级旋流器的基础上发展起来的.1945年荷兰国家矿山局(DuthStateMines)的一套从分级旋流器演变而来的,处理能力为15t/h的圆锥-圆筒型重介质旋流器(简称DSM)中间试验装置投入运转.荷兰最初研制的DSM重介质旋流器是目前世界上应用最广泛的一种末煤重介质收稿日期:____-12-20基金项目:“十五”国家科技攻关基金资助项目(____BA615A-12)作者简介:刘峰(1957-),男,安徽怀远人,博士,研究员.Tel:0315-2813144,E-mail:lf-mail@1631com
