L11-4 发动机供油讲解

EngineFuelFeedTheenginefuelfeedsystemusesthesecomponentstosupplyfueltotheengines:Centertankboostpumps【增压泵】(2),ForwardandAftboostpumps(4),Bypassvalve(2),Crossfeedvalve【交输活门】,Enginefuelsparvalve(2),Waterscavenge【v.清除污物，打扫】ejectorpump(4).EngineFuelFeedLetuslookatthecomponentsusedtosupplyfueltoengines:EngineFuelFeedYoumustknowthefunctionofthefollowingcomponents:SwitchesBypassvalveSparvalveCrossfeedvalveThewaterscavengejetpumps【引射泵】EngineFuelFeedTheswitchesonthefuelsystempanelcontroleachcentertankboostpumpandeachforwardandaftboostpumpformaintank.Theswitchescontrolelectricalpowertothepumps.Abypassvalvesuppliesasecondaryfuelflowpathtotheengines.EngineFuelFeedThebypassvalvesoperateautomatically.Theenginefuelsparvalvescontrolfuelflowtotheengines.Theenginestartleversandtheenginefireswitchescontroltheenginefuelsparvalves.发动机起动手柄和发动机灭火电门控制着发动机燃油翼梁活门。EngineFuelFeedThecrossfeedvalvepermitsasinglefueltanktosupplyfueltobothengines.Thewaterscavengejetpumpsremovewaterfromthelowpointsofeachtanktopreventcorrosion【n.腐蚀，锈蚀】.EngineFuelFeedInthewheelwells,themaintankaftboostpumps,andcentertankboostpumpsarelocatedontherearspar.Themaintankforwardboostpumpsaremountedon【安装在】thefrontspar.Eachofboostpumpsinmaintankisinterchangeable.Themaintankboostpumpsarenotinterchangeablewiththecentertankboostpumps.EngineFuelFeedWithfuelinallthreetanksandallpumpoperating,thecentertankboostpumpsprovidebackpressure,whichmakethemaintankboostpumpcheckvalvesclosed,ensuringthecentertankfuelisusedfirst.在3个油箱都有油且所有的泵都正常运行的前提下，中央油箱增压泵向主油箱增压泵的单向活门提供反向压力并使其关闭，从而确保中央油箱的燃油最先被使用。Afterthecentertankisempty,theboostpumpsprovidefuelfromthemaintanks.EngineFuelFeedIntheeventthatboostpumpsarenotoperating,suctionflowfrommaintanksisavailablethroughabypassvalve.Suctionflowisnotpossiblefromcentertank,asthereisnobypassvalve.Acrossfeedvalveinterconnects【v.相互连接】theleftandrightsidecrossfeedmanifolds.Thisallowsanytankstofeedeitherpowerplant.EngineFuelFeedSomequestionsaboutenginefuelfeedoperation:Wherearetheseboostpumps?Canyouinterchangethemaintankboostpumps?Whataboutmaintankpumpsandcentertankpumps?Ifeverythingiso