氣液兩相流流動結構多尺度及非線性特性分析.pdf

1、天津大學碩士學位論文氣液兩相流流動結構多尺度及非線性特性分析姓名：董芳申請學位級別：碩士專業(yè)：檢測技術與自動化裝置指導教師：金寧德20070101ABSTRACTInthispaper，theconductancefluctuatingsignalsofgas／liquidtwophaseflowareprocessedbywaveletanalysismethodandrecurrenceanalysismethod，whichcou

2、ldexplainthedynamiccharacteroftwophaseflowpatternsinviewofmulti—scaleandnonlinearanalysisTheresultsindicatethatrecurrenceplotsofdifferentscalesignalsreflectthedynamicstructurecharactersofgas／liquidtwo—phaseflowfromlowban

3、dtohighbandFivetypicalflowpatternsalltakeonbetterrecurrencenatureandrecurrenceplotsrepresentdevelopmentlinetexturestructureinlowbandHoweverthedifferentflowpatternsbehavedifferentfeaturesinhi曲bandrecurrenceplotsTherectang

4、lemassivetextureappearsinslugflowrecurrenceplotsbecauseofitsperiodicityandstochasticmovementofbubbleflowandchurnflowbecomesstrongerwiththefrequencyincreasing，SOisolaiedpointsdistributeinhighbandrecurrenceplotsstochastica

5、llyAndthen，thedynamicstructurecharacters，ofdifferentflowpatternsoneachscalecanalsobeobtainedbyanalyzingtherulesofthreemeasuresofrecurrencecharacteristicwiththegassuperficialvelocityincreasingHence，themulti—scaleanalysisi

6、sapowerfultooltOcharacterizethedynamicmovementoftwo—phaseflowfrommacroscaletomicroscaleMoreovertheexperimentdataarealsesearchedbythecomplexitymeasuremethodAndtheresultsshowthattheLempelandZivcomplexity、spectrumentropyand

7、approximateentropyaresensitivetOtheflowpatterntransitioningas／liquidtwo—phaseflowThedynamicsstructurecharacteristicsofgas／liquidtwO—phaseflowpatternsCanalsoberevealedbyanalyzingtherulesofthreecomplexitymeasureschangingwi

8、thgas／liquidtwo—phaseflowparametersTherearecommendablycorrespondingrelationsbetweencomplexitymeasuresandrecurrencequantificationanalysiseigenvaluesItindicatesthecomplexitymeasuresprovideefficientassistantanddiagnosableto