ASHRAE.4516-2002 Data Processing of Large-Scale Particle Image

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1、4516(RP-978)DataProcessingofLarge-ScaleParticleImageVelocimetryMeasurementsAroundtheHumanBodyWeiweiJiaByronW.Jones,Ph.D.,P.E.FellowASHRAEMohammadH.Hosni,Ph.D.HuiMeng,Ph.D.MemberASHRAEABSTRACTcabin.Thispaperdescribestheparticleimagevelocimetry(PIV)dataprocessingtechniquesdevelopedint

2、hefirstphaseThispaperdescribestheapplicationofparticleimageofthestudy.Thesametechniqueswerelaterusedforthevelocimetry(PIV)tothelarge-scaleflowfieldsinthevicinitysecondphaseaswell.Morein-depthdescriptionsofthedataofapersoninaroom.Duetothelargeimagingareasrequiredprocessingtechniquesd

3、escribedinthispaperareprovidedbyforsuchmeasurements(overtwometersineachdimension)Jia(1999).andthelowairvelocities(0.05m/s),thePIVtechniqueforthisapplicationencountersuniquechallenges.SuchchallengesTheexperimentswereconductedinanenvironmentalincludeunevenillumination,largerelativevel

4、ocityerrors,andchamberdescribedindetailbyHawkins(1994).Theconfig-largeout-of-planedisplacementswithinthethicklightsheet.urationofthetestroomisshowninFigures1and2.AthermalAfullyintegratedPIVsystemwithtwo-dimensionaldatamanikinwasusedtosimulatethermalcharacteristicandprocessingsoftwar

5、ewasimplementedspecificallytomeetblockageeffectsofahumanbody.Myers(1995)providesthesechallenges.Cross-correlationwasemployedforPIVadditionalinformationabouttheuseofthemanikinforthisvelocityextraction,andasimplebuteffectivesubpixelcalcu-purpose.Ahighside-wallgrilleinletwasusedtosuppl

6、ycondi-lationschemewasdevisedtoimprovetheaccuracyofthetionedairintotheroomandtheresultingcoolairjetdroppedcorrelationpeaklocation.Also,atechniqueforcorrectionofinthevicinityofthemanikin.Asteadystreamof20mmhollowin-planevelocityerrorsduetotheout-of-planevelocityexpandedplasticspheres

7、wasinjectedintothesupplycomponentwasdeveloped.ThisPIVtechniquewasappliedtoairstreamtoseedtheairthroughoutthechamber.Aroundthethemeasurementsofthelarge-scaleairmotionaroundather-manikin,measurementswerecollectedinfiveverticalplanesmalmanikininawell-controlledenvironmentalchamber.Thei

8、neachhorizontaldire