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1、第30卷第5期仪器仪表学报Vol30No52009年5月ChineseJournalofScientificInstrumentMay2009基于圆管内近球形颗粒液两相流的三维颗粒图像测量技术1311,2沐光雨,杨火军,郭晓新,欧阳丹彤(1吉林大学计算机科学与技术学院长春130012,中国;2符号计算与知识工程教育部重点实验室长春130012,中国;3建筑工程系,内布拉斯加州林肯大学内布拉斯加州林肯市NE68182,美国)摘要:应用三维颗粒图像跟踪技术,对竖直圆管内发泡聚苯乙烯油层流两相流中分散相即颗粒相瞬时分布进行非接触测量。实验用一面与正视方向成45的平面镜
2、将流场的侧视方向反射到正视方向,摄像机连续将流场瞬时的侧、正视像同时拍摄下来,对图像进行识别等数字化处理后就获得了颗粒像的二维平面位置。分析摄像系统的成像关系,校正摄像系统的误差,确定颗粒在竖直方向、管径方向、灰度值等方面的匹配条件,再通过侧、正视图的匹配操作找回颗粒中心的三维空间位置,为两相流的相分布测量提供了高精度的新方法。关键词:悬浮颗粒两相流;颗粒图像跟踪技术(PIT);三维成像技术;图像匹配中图分类号:TE92TP312文献标识码:A国家标准学科分类代码:520.6040Threedimensionalparticleimagemeasurementtechniquefo
3、rspheroidparticleliquidtwophaseflowsinsideroundtube1311,2MuGuangyu,YangHuojun,GuoXiaoxin,OuyangDantong(1CollegeofComputerScienceandTechnology,JilinUniversity,Changchun130012,China;2KeyLaboratoryofSymbolicComputationandKnowledgeEngineeringofMOE,Changchun130012,China;3DepartmentofArchitecturalEngine
4、ering,UniversityofNebraskaLincoln,NE68182,USA)Abstract:Withathreedimensionalparticleimagetrackingtechnique(PIT),theinstantaneousdistributionofparticles(thedispersephase)wasnonintrusivelymeasuredforupwardslaminarlargeandsphericalexpandedpolystyreneparticleoiltwophaseflowinaverticalpipe.Intheex
5、perimentamirrorisusedtoreflectthesidedirectionoftheviewwindowoftheflowfieldtothefrontdirection,whichismountedbythesideoftheviewwindowoftheflowfieldatanangleof45toitsfrontdirection,andthenacamera(CCD)continuouslyshotstheinstantaneousfrontandsideviewsoftheflowfieldsimultaneously;the2dimensionalposit
6、ionsoftheparticleimagesareobtainedafterdigitalimageprocessingsuchasimagerecognition;the3Dpositionsofparticlesaredeterminedbyanalyzingtheimagingrelation,correctingtheerrorof3Dphotographicsystem,determiningtheconditionsofparticleimagematchingintermstoverticaldirection,radialdirection,imagegrayscalean
7、dotherfactors,andmatchingtheparticlefrontimageswithsideones,whichprovidesanewaccuratemethodformeasuringthephasedistributionstructureofthesuspensionparticlesintwophaseflow.Keywords:particlesuspensio
