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1、1454,Page1SomeAspectsofEstimatingGeometricCharacteristicsofScrewCompressors1221DavidBUCKNEY*,AhmedKOVACEVIC,3†2ElvedinMUJIC,NikolaSTOSIC1HowdenCompressorsLtd.,ResearchandDevelopment,Glasgow,UK,CorrespondingAuthorContactInformation(david.buckney@howden.com)2CityUniversityLondon,CentreforPo
2、sitiveDisplacementCompressorTechnology,London,UK3BITZERKühlmaschinenbauGmbH,ResearchandDevelopment,Rottenburg,GermanyABSTRACTThemethodsusedtodayforthecalculationofscrewcompressorthermodynamicandfluidflowprocesses,fromquasione-dimensionalthermodynamicmodelstothree-dimensionalcomputationalflu
3、iddynamics(CFD)procedures,requireaccurateidentificationandquantificationofgeometricparameters,suchasvolume,gradientandcross-section,leakageflowandblow-holeareas.Historically,someofthegeometriccharacteristicshavebeenneglected,orapproximatedwhencalculationaccuracywasnotessential.However,mores
4、ophisticatedmodelsmaylosesomeoftheiradvantagesifaccurategeometriccharacteristicsarenotincludedinthem.Theworkpresentedinthispaperisaimedtoenhancetheaccuracyofgeometriccalculations.Theusualgeometriccalculationproceduresaregivenandmodifiedwherenecessary.Theresultsarecomparedwithmodelsgenerated
5、by3DComputerAidedDesign(CAD),softwarepackages,fromwhichimprovementsintheaccuracyofpredictionscanbedemonstrated.1.INTRODUCTIONPioneeringworkintheaccuratepresentationofscrewcompressorgeometrywasgiveninthecomprehensivescrewcompressortextbookbySakun(1960)andthescrewcompressorhandbookbyAmosov(19
6、77),whileRinder(1979)presentedasimilarwork,givenonthebasisof,themostpopularscrewcompressorprofileofthattime.Notlongafter,Singhetal.(1984,1988and1990)presentedaseriesofthreepapersdealingmoreorlesssuccessfullywithscrewcompressorgeometry,whileSangfors(1984)forthefirsttimepublishedtheprinciples
7、ofdifferentialmodellingofthescrewcompressorthermodynamicprocess.Stosicetal.(1986),publishedacomprehensiveapplicationofsuchadifferentialmodel,previouslywidelyusedinthemodellingofinternalcombustionenginesandreciprocatingcompressors,tocalculatescrewcompress
