《气动技术》双语电子教案+吴洪明_Chapter1+Fact+&+theory.ppt

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1、FactsandTheoryofAirForindustrialpneumatics《气动技术》双语电子教案吴洪明Chapter1WUHANUNIVERSITYOFTECHNOLOGYLOGISTICSENG.DEPT.武汉理工大学物流工程系ContentsCompositionofairAtmosphericpressureIndustrialcompressedairPressurePressureunitsPressureandforceThegaslawsConstanttemperatureConstantpressureConsta

2、ntvolumeGeneralgaslawAdiabaticcompressionWaterincompressedairLowtemperaturedryingFlowofcompressedairAirqualityClickthesectiontoadvancedirectlytoit《气动技术》双语电子教案吴洪明Chapter1CompositionofairTheairwebreatheisspringy,squashyandfluidinsubstanceWetakeitforgrantedthatwhereverthereissp

3、aceitwillbefilledwithairAiriscomposedmainlyofnitrogenandoxygenCompositionbyVolumeNitrogen78.09%N2Oxygen20.95%O2Argon0.93%ArOthers0.03%《气动技术》双语电子教案吴洪明Chapter1AtmosphericpressureTheatmosphericpressureiscausedbytheweightofairaboveusItgetslessasweclimbamountain,moreaswedescendin

4、toamineThepressurevalueisalsoinfluencedbychangingweatherconditions《气动技术》双语电子教案吴洪明Chapter1StandardAtmosphereAstandardatmosphereisdefinedbyTheInternationalCivilAviationOrganisation.Thepressureandtemperatureatsealevelis1013.25millibarabsoluteand288K(15OC)1013.25mbar《气动技术》双语电子

5、教案吴洪明Chapter1ISOAtmospheresISORecommendationR554StandardAtmospheresforconditioningand/ortestingofmaterial,componentsorequipment20OC,65%RH,860to1060mbar27OC,65%RH,860to1060mbar23OC,50%RH,860to1060mbarTolerances±2OC±5%RHReducedtolerances±1OC±2%RHStandardReferenceAtmospheretowh

6、ichtestsmadeatotheratmospherescanbecorrected20OC,65%RH,1013mbarNoqualifyingaltitudeisgivenasitisconcernedonlywiththeeffectoftemperature,humidityandpressure《气动技术》双语电子教案吴洪明Chapter1AtmosphericpressureWeseevaluesofatmosphericpressureonaweathermapThelinescalledisobarsshowcontours

7、ofpressureinmillibarThesehelppredictthewinddirectionandforceLOW1015mb1012mb1008mb1000mb996mb《气动技术》双语电子教案吴洪明Chapter1MercurybarometerAtmosphericpressurecanbemeasuredastheheightofaliquidcolumninavacuum760mmHg=1013.9millibarapproximatelyAwaterbarometertubewouldbeover10metreslong

8、.Hg=13.6timesthedensityofH2OForvacuummeasurement1mmHg=1Torr760Torr=nilvacu