【7A文】Introduction to Diesel Eengine(柴油机分析介绍).ppt

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1、IntroductiontoDieselEngineAnalysisEngineClassificationinternalcombustionengineCompressionignitionengine(Dieselengine)SparkignitionengineGasturbineExternalcombustionengineSteamturbineStirlingengineCrankShaftCylinderHeadPistonBlockConnectingRodSequenceofEvent(4Stroke)SuctionFreshairenterin

2、gthecylinder(naturallyaspiratedorturbocharger)throughintakeport,pistonmovefromTDCBDC,intakevalveopenmeanwhileexhaustvalveclose.CompressionPistonstartmovebacktoTDCandcompresstheair.Bothofintakeandexhaustvalveareclosed.JustbeforereachingtheTDC,fuelstarttoenterthecylinderthroughinjector.Th

3、ecompressedairhashighpressureandhightemperaturethefuelstarttoigniteandreleasetheenergytothecylinderchamberincreasethegastemperatureandpressure.ExpansionPistonpushbacktotheBCD.Bothofintakeandexhaustvalveareclosed.ExhaustExhaustvalveopen.Combustionproductleavethecylinderthroughtheexhaust

4、port.pistonmovefromBDCtoTDC.TDCBDCPressure–CrankAngleDiagramThermodynamicsPropertiesPPressureAreaFF=P*ApW=F*dxW=(P*Ap)*dxPVThermodynamicPropertiesDiagramP-VPanelMukaFrontDisplayTrapLeftRightUnitSnapTrapTrapdefOn/OfF1On/OfF3CursorScaleLightDieselBasicAnalysisExhaustvalveopenIntakevalveope

5、nIntakevalvecloseExhaustvalveclosePressure–CrankAnglePressureRiseRateStartofinjectionStartofcombustionMaxriserateDieselBasicAnalysisCombustionStatisticPmaxPmeanStandarddeviationDieselBasicAnalysisPositiveworkPblowdownPressure–VolumeDiagramDieselBasicAnalysisPressureParadeDieselBasicAnaly

6、sisEngineCombustionReportIndicatedhorsepowerDieselBasicAnalysisEngineCombustionReport(2)DieselBasicAnalysisEngineCombustionReport(3)AVE-AveragePFPofallcyclesforeachindividualpowercylinder.DEV-DeviationinPFPofallcyclesforeachindividualpowercylinder.Max-MaximumPFPseenonallcyclesforeachindi

7、vidualpowercylinder.Min-MinimumPFPseenonallcyclesforeachindividualpowercylinder.Delta-DifferencebetweentheengineaveragePFPandtheaveragePFPforeachindividualcylinder.VibrationPatternImpactGasFlowSlidingContactDieselBasicAnalysisCylinderVibration–CrankAngle()DieselBasicAnal