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1、【基于格子Boltzmann方法的换热器优化模拟】ansys拓扑优化实例摘要：为优化换热器的结构设计，用格子Boltzmann方法(LatticeBoltzmannMethod,LBM结合多孔介质模型模拟换热器内的换热，研究雷诺数、普朗特数和热扩散率比的变化对温度场和换热性能的影响.模拟结果表明：在小雷诺数范围内，随着雷诺数的增加，努塞尔数先增加后减小，即存在一个使换热性能达到最好的雷诺数；随着普朗特数的增加，努塞尔数减小，换热性能降低；随着热扩散率比的增加，换热性能提高.分析不同管柱排列方式对换热性能的影响，结果表明：叉排的换热效果明显优于顺排，当横向节距等于2时，对
2、于均匀顺排或叉排，努塞尔数均随纵向节距的增加而减小，这与实验结果相符；对于非均匀叉排，采用“前密”或“中间密”的排布方式有利于换热.关键词：换热器；格子Blotzmann方法；传热系数；多孔介质模型：TK124；TQ.021.3文献标志码：BOptimizationsimulationonheatexchangerbasedonlatticeBoltzmannmethodJIANGDongdong1,ZHOUShenggen2(1.SchoolofMechanicalEngineering,ShanghaiJiaotongUniversity,Shanghaixx40,
3、China;2.SchoolofScience,KunmingUniversityofScienceandTechnology,Kunming650500,China)Abstract：Tooptimizethestructuredesignofheatexchanger,theheatexchangeinheatexchangerissimulatedbyLatticeBoltzmannMethod(LBM)biningwithporousmediummodel.TheeffectofReynoldsnumber,Prandtlnumberandthermaldiff
4、usivityratioontemperaturefieldandheatexchangeperformanceisstudied.Thesimulationresultsindicatethat,forsmallReynoldsnumber,NusseltnumberfirstlyincreasesandthendecreaseswiththeincreaseofReynoldsnumber,i.e.,thereexistsanoptimumvalueofReynoldsnumberwhichyieldsthebestheatexchangeperformance;N
5、usseltnumberdecreaseswiththeincreaseofPrandtlnumber,i.e.,theheatexchangeperformanceisweakened;theincreaseofthermaldiffusivityratiostrengthensheatexchange.Theheatexchangeperformanceunderdifferentarrangementsofpipesareanalyzed,andtheresultsshowsthat，heatexchangeperformanceofstaggeredpipsba
6、nkismuchbetterthanthatofalignedpipes;ifthetransversalpitchissetastwo,Nusseltnumberdecreaseswiththeincreaseoflongitudinalpitchforbothalignedandstaggeredpipes,whichisconsistentwithexperimentalresults;fornonuniformstaggeredpipes,thearrangementsofaintensityinthefront“oraintensityinthemiddle”
7、indicatebetterheatexchangeperformance.Keywords：heatexchanger;latticeBoltzmannmethod;heattransfercoefficient;porousmediummodel换热器性能的好坏直接影响能源利用和转换的效率.对换热器中的流体流动、热量传递和结构尺寸等进行综合性能分析并进行相应的优化设计，具有理论指导意义和工程实用价值.按现有计算机硬件和软件条件，对换热器按照实际管、壳程的流动换热情况进行模拟是不现实的.PATANKARS[1]最早应用CFD寸管壳式换热
