基于三維紊流數值模擬的空氣濾清器結構優(yōu)化設計.pdf

1、山東輕工業(yè)學院碩士學位論文基于三維紊流數值模擬的空氣濾清器結構優(yōu)化設計姓名：賈彥龍申請學位級別：碩士專業(yè)：機械電子工程指導教師：王仁人20080522ABSTRACTABSTRACTAsanimportantcomponentoftheintemalcombustionengineintakesystem，theairfilterhasdirectlyeffectonitsperformancesTheimprovementofthef

2、lowvelocitydistributionandthereductionofthepressurelossarehelpfultoincreaseairfilterfiltrationefficiencyandprolongitsservicetime，andtheyarealsothekeystodesignairfilterWithadvancedthreedimensionalnumericalsimulationtechno

3、logy，thedetailflowfiledintheairfiltercanbeobtained，andtheoverallevaluationcanbegotten，andtheimportanttheoreticalfoundationcanbeprovidedforthestructureoptimizationoftheairfilterThemeshinthepreliminaryfilterandthefibrecore

4、ofthefinefilteraresimulatedwithaporousmediummodelandthenthemathematicalmodeloftheflowinairfilterissetupThethree—dimensionalgeometrymodelsoftheairfilteraremadebyPro／Engineer，andthenumericalsimulationcomputationgridsofthef

5、lowfieldinairfilteraregeneratedbySTAR—CDpretreatmenttoolPro／amBasedonSTARCDthesimulationoftheflowfieldintheairfilteriScarriedoutmoredetailedaftertheinitialandboundaryvaluesaredeterminedTheflowfieldvisualizationisdonewith

6、thepressureatlasandvelocityvector，thepressureandvelocitydistributionsaregottenTheresultsshowthattheflowhadastrongimpactontheentrancecornerofairfilterinletpart，thevelocitydistributionoftheexitisuneven，andthevortexesexisti

7、nairfilter，SOthatitcausedgreaterpressurelossTheinfluencesofinletboxarcininletoftheairfilteronthepressureandvelocitydistributionsaresimulatedandanalyzed，andthentheinletboxshapeoftheairfilterisoptimizedusingthearcstructure

8、toreplacetheoriginallinearstructureTheoptimizationresultsshowthatthevelocitydistributionuniformityisenhanced1O％andthepressurelOSSiSreduced32％afterthestructureoptimizedKeywords：AirFilter；FlowField；NumericalSimulation；Stru