當(dāng)量螺旋角對三分螺旋折流板換熱器殼側(cè)性能的影響.pdf

1、東南大學(xué)碩士學(xué)位論文當(dāng)量螺旋角對三分螺旋折流板換熱器殼側(cè)性能的影響姓名：李彥晴申請學(xué)位級別：碩士專業(yè)：土木工程；供熱、供燃?xì)?、通風(fēng)及空調(diào)工程指導(dǎo)教師：陳亞平20110309StudyoninfluenceofequivalenthelixangleontheperformanceatshellsideoftrisectionbamedhelixheatexchangersLIYanqingSupervisor：CHENYapingABS

2、TRACTThescheme0ftrisection。baffledhelixheatexchangersiSamodificationbasedontheschemeofquadranthelicalbaffledheatexchangersItreducesthenumberofbafflepartsandhasthefeaturesoffittingequilateraltrianglearrangementoftubesThei

3、nfluenceofequivalenthelixangleontheHeattransferandflowperformanceatshellsideoftrisectionbaffledhelixheatexchangersisstudiedbyexperimentandnumericalsimulationThedesignsoftwarefortheshell—andtubeheatexchangershasbeenprogra

4、mmedTheexperimentisconductedonheatexchangerswithinclinedanglesof100，150and200sectorbaffles，150ellipsebaffles，20。overlappedsectorbafflesandsegmentbafflesTheyhavedifferentequivalenthelixanglesduetotheinclinedangle，theformo

5、fbafflesandtheextentofaxialoverlapTheinfluenceofequivalenthelixangleontheperformanceatshell—sideoftrisection—baffledhelixheatexchangersisevaluatedbytheheattransfercoefficient，theshellsideheattransfercoefficient，pressured

6、ropandtheintegratedperformanceindexTheresultsshowthattheheattransfercoefficientofthetrisectionba用edhelixheatexchangersisbetterthanthatwithsegmentbaffleschemeTheintegratedperformanceindexofsectorbaffleheatexchangerwithinc

7、linedangleof200isabout30％higherthanthatofsegmentbaffleheatexchangerWhileintherangeof100to200oftheinclinedangle，thelargerequivalenthelixangleisbetterforobtaininggreaterheattransfercoefficient，integratedperformanceindexand

8、lowershellsidepressuredropThecorrelationequationisobtainedforshell—sideheattransfercoefficientandpressuredropoftrisectionbaffledhelixheatexchangersAmathematicalmodelofsectorshapedtrisectionbaffledhelixheatexchangersisest

9、ablishedforthenumericalsimulationbyusingCFDTheflowfield，temperaturefieldandpressuredistributionoftheheatexchangerswiththeinclinedangleof200areintroducedComparedwithexperimentaldata，thesimulationresultscanclearlyreflectth

10、etrendsofheattransfercoefficientandpressuredropatshellsideBycomparingthesimulationresultsofthreesectorshapedtrisectionbaffledhelixheatexchangerswithinclinedanglesof200，300and400，jtiSfoundthattheheattransferandflowperform