简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:Fluentversion6.2computationalfluiddynamicsenvironmenthasbeenenhancedwithapopulationbalancecapabilitythatoperatesinconjunctionwithitsmultiphasecalculationstopredicttheparticlesizedistributionwithintheflowfield.Thepopulationbalanceissolvedbythequadraturemethodofmoments(QMOM).Fluent'spredictioncapabilitiesaretestedbyusinga2-dimensionalanalogyofaconstantlystirredtankreactorwithafluidflowcompartmentthatmixesthefluidquicklyandefficientlyusingwallmovementandhasafeedstreamandaproductstream.TheresultsoftheseFluentsimulationsusingQMOMpopulationbalancesolverarecomparedtosteadystateanalyticalsolutionsforthepopulationbalanceinastirredtankwhere1)growth,2)aggregation,and3)breakage,takeplaceseparatelyand4)combinednucleationandgrowthand5)combinednucleation,growthandaggregationtakeplace.Theresultsofthesecomparisonsshowthatthemomentsofthepopulationbalanceareaccuratelypredictedfornucleation,growth,aggregationandbreakagewhentheflowfieldisturbulent.Withlaminarflowthemixingisnotidealandasaresultthesteadystatewellmixedsolutionsarenotaccuratelysimulated.
简介:摘要:文章主要是分析了Fluent计算,在此基础上讲解了风道结构的优化情况,望可以为有关人员提供到一定的参考和帮助。
简介:摘要本文以计算流体力学为理论依据,基于FLUENT环境,对全新开发产品新风除霾机组(手板样机)的风道系统进行CFD仿真分析,经过样机的初步风量测试发现,机组顶部功能段(高效过滤、加湿、香氛功能段)安装后,导致整个机组风量损失较大,噪音偏高,因此针对机组第二段与第三段装配处(风机及以上部位)的流体分布状态进行仿真分析。结合仿真分析结果,追踪出风道结构设计不合理区域,重新评估方案并改进设计风道结构。机组风道改进设计后,再次测试机组风量,发现风道结构优化后的总风量比优化前提升20%左右,噪音值(声压级)降低2分贝左右。通过仿真分析及实际测试结果显示,CFD仿真分析结果较为精准,实现了缩短新产品开发周期的目的,降低了研发成本。
简介:【摘要】基于CFD方法,利用动网格数值模拟技术,应用FLUENT软件对某型号单向阀进行了动态仿真。从仿真与试验的结果中表明:单向阀阀芯在工作压力下的位移,与单向阀内提供开启力的弹簧力值和刚度、阀体结构以及试验管路有着密切关系。在固定工作压力及出口体积流量条件下,阀门的阀芯在单向阀中的位移很难仅仅通过试验或仿真进行确定,在阀门从开到闭的过程中根据瞬态数值仿真,得到阀门移动到每个确定位置时的流阻,再与试验结果结合对比分析,得到试验流阻下的活门位移。