.轮机英语（轮机长大管轮）Lesson 5 Design Features of MC Engines.ppt

Lesson5DesignFeaturesofMCEnginesNewWordsandExpressionsoverhaul[?o?v?rh?:l]n.大修，检查，彻底检修，详细检查topland[tɑ:pl?nd]n.(活塞的）顶岸高度combustion[k?m?b?st??n]n.燃烧mating[?me?t??]n.接触，结合greycastiron[ɡrek?st?a??rn]n.灰口铸铁biannual[ba???nju?l]adj.一年二次的component[k?m?po?n?nt]n.成分，组分，零件uppermost[??p?rmo?st]adj.最重要的，最高的，至高的NewWordsandExpressionspatent[?p?tnt]n.专利，执照，专利品adoublelapjointn.重叠搭口groove[ɡruv]n.凹槽，环槽vt.开槽于Al-bronze[brɑ:nz]n.铝青铜，铜铝合金coating[?ko?t??]n.涂层，覆盖层ash[??]n.灰，灰烬hypothesis[ha??pɑ:θ?s?s]n.灰，灰烬NewWordsandExpressionsdecisive[d??sa?s?v]adj.决定性的，坚定的，果断的，决断的deterioration[d??t?r???re??n]n.恶化，退化，堕落byvirtueofadv.依靠，由于chambergeometryn.燃烧室几何形状weld[w?ld]vt.焊接n.焊接，焊缝inconel[?nko?nl]n.铬镍铁合金heatresistancen.耐热性decisive[d??sa?s?v]adj.决定性的，坚定的，果断的，决断的NewWordsandExpressionsmargin[?mɑ:rd??n]n.边缘，范围，空白shakercoolingn.晃动冷却，振荡冷却pronounced[pr??na?nst]adj.明显的，显著的，被说出来的Inrecentyears,anumberoffeatureshavebeensuccessfullyintroduced,primarilywiththeaimoffurtherimprovingthecylinderconditionandincreasingthetimebetweenoverhauls.Inthiscontext,weareinparticularaddressingfeaturessuchasthehightoplandpistonwhichprotectsthepistonringsagainstthethermalloadfromthecombustiongases.Thisimprovestheperformanceofthepistonringpacksignificantly,andthegraduallossoftensioninthepistonringsisreduced,resultinginhigherTBOsforthepiston.Afurtherbenefitisthatthehightoplandhasmadeitpossibletolowerthematingsurfacesbetweencylinderlinerandcylindercover,thusreducingthethermalloadonthecylinderlinerandthusimprovingtheconditionsforthelubeoilfilm(提高活塞顶岸高度的好处还有：使降低气缸套和气缸盖的结合面的高度成为了可能，这降低了气缸套的热负荷并大大改善了润滑油膜的工作条件).Thehighheatinputisabsorbedbythesteelcylindercover,whichhasahigherthermalstabilitythanthegreycastironusedforcylinderliners.Asaconse