推进系统实验邓甜1

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1、PRACTICALCOURSE(TP1)BASICSONAlRBREATHINGENGINESCIass:PRTutor:DengTian1.AsshowintheFigure1,wecanseethepositionofthefan,theHPcompressors,thecombustionchamber,theHPandLPturbinesandtheHPandLPshafts.2.Fan・HPshaftsyHPcompressor-HPturbine-LPturbine・LPshafts-Combus

2、tionChamber・Figure1DGEN380enginestructure3.TheengineofDGEN38Oisaturbofanengine.Basedonthe3Ddynamicengineview,wecanknowthattheengineisabypassengineandithasafanwhichcandrawtheair.4.Thethreeoperatingphasesthatwillbefoundinanytypeofairbreathingenginesinclude:・c

3、ompressionofair-combustionoffuel・expansionofgas.Themechanicalpartsthatwillbeusedfortherealizationofthesethreephases-highpressurecompressor-combustionchamber・highpressureturbineandlowpressureturbine.Figure2CompressionofairFigure3CombustionoffuelFigure4Expans

4、ionofandthemechanicalpartsareshowninthefollowthreefigures.Figure5HPcompressorFigure6combustionchamberFigure7HPandLPturbine5.Thepositionisshowninthefollowfigure8Figure8Positionofeverynumber6.(1)Basedonthe3Dvisualizationtool,themechanicalpartsofthehighpressur

5、elinearegearbox,HPshafts,HPcompressorandHPturbine.TheHPcompressoriscentrifugal,becausetheexhaustdirectionisradial.TheHPturbineisaxial,becausetheexhaustdirectionisaxial.Figure9HPshaftsandflow(2)Basedonthe3Dvisualizationtool,themechanicalpartsofthelowpressure

6、lineareLPturbineandLPshafts.Therotatingpartsisaxial,becausetheexhaustdirectionisaxial.Figure9LPshaftsandflow(2)Asweseeinthepicture,thefanisconnectedwiththeLPturbinebyLPshafts.ThegasfromthecombustionchamberdrivesLPturbinetorotateatahighspeedandtheLPshaftsrot

7、atestogetherThelowpressureturbinegathersapartoftheresidualkineticenergyoftheexhaustgastodrivethefanspoolthroughthegearbox.(3)Theadvantageofusingagearboxisreductionofthenumberoflowpressureturbinesandthustheglobalweightandsizeoftheengine.Thedisadvantageofusin

8、gagearboxisthedifficultiesinmaintenancebecauseofnumerousgears.6.ThecombustionchamberoftheDGEN380isanannularcombustion.Anannularcombustionisintheshapeofaringoracylinderandthewholeoftheannulusbetweenthec