【英语翻译Asmentionedabove,whenthevelocityontheductinducedbypropelleriscomputed,twodifferenttreatmentsareapplied.Fig.4givesthecomparisonofresultsobtainedbytwotreatments,inwhich“CAV”and“NAV”denotecircumferentially】|小学英语问答-字典翻译问答网

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【英语翻译Asmentionedabove,whenthevelocityontheductinducedbypropelleriscomputed,twodifferenttreatmentsareapplied.Fig.4givesthecomparisonofresultsobtainedbytwotreatments,inwhich“CAV”and“NAV”denotecircumferentially】

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英语翻译

Asmentionedabove,whenthevelocityontheductinducedbypropelleriscomputed,twodifferenttreatmentsareapplied.Fig.4givesthecomparisonofresultsobtainedbytwotreatments,inwhich“CAV”and“NAV”denotecircumferentiallyaveragedandnotaveragedtreatmentsrespectively.ItisseenfromFig.4thatthethrustofductatlowadvancecoefficientcanbeimprovedwhentheinducedvelocityofpropellertoductisnotcircumferentiallyaveraged,namelythewakebehindtheductexists.ThisconclusioniscoincidentwiththatfromRef.[7].

InFigs.5and6,parameterBTKIisacoefficientdeterminingthehydrodynamicpitchangleinthetransitionregionofthewakeofpropeller.UsuallyBTKI=0.5isadoptedbypanelmethodforthesinglepropeller.ItcanbeseenfromFigs.5and6thatBTKI=0.43givesbetterresultsforthecaseofJD7704duct+KApropellerseriesandBTKI=0.48forthecaseofJD7704duct+JDCpropellerseries.

Inthenumericalcalculationsofpanelmethod,thetrialingwakesheetofthepropellerandductaretruncatedatcertaindistancebehindthepropellerorduct.Fig.7showsthatreasonableresultscanbeobtainedwhentransitionwakerangeofthepropelleris1080degrees.ItisfoundfromtheFig.8thatthenumericalresultbecomesconvergedgraduallywiththeincrementofregionoftrailingvortexwakeofduct,andtherewillbenoeffectonthethrustofductifthewakelengthoftheductisoverfourtimesofthelengthoftheduct,whichwillbeusedinthefollowingcalculations.Fig.9showsthatthecontractioncoefficientofthetransitionwakeofthepropeller,RW0,makesnoinfluenceonthecalculatedresults,evenRW0=0.83,0.98or1.0(“NoContra”inthefigure).RW0=0.83isadoptedinthepresentpaper.

陈孝春回答：

　　如上述提到的,当计算出由螺旋桨在导管上引起的周转率时,可应用两种措施.图4给出了两种措施的结果比较,分别在“恒定角速率”及“NAV"环绕地表示平均处理与不平均处理时的情况.从图4看出当螺旋桨的诱导速度对导管环...

吕骎回答：

　　求大神再帮我翻译下补充的内容，追加30分，拜托了，万分感谢。

陈孝春回答：

　　在板块法的数值计算中，在螺旋桨或导管后面的螺旋管尾部尾迹薄板与导管被缩短到一定的距离。图7显示出当螺旋桨的转变区尾迹范围值为1080度时可以获得合理的结果。从图8可以发现当导管的尾部涡流尾迹的范围增量时数值结果会逐渐变得聚合起来，并且如果导管尾迹的长度超过导管长度的4倍时将会对导管推力没有影响，这将会被使用到下面计算。图9显示了螺旋桨转变区尾迹的收缩系数:RW0，这对计算结果没有影响，即使RW0=0.83,0.98或1.0（图表“没有对立面”）时对计算结果还是没有影响的。本论文采取了RW0=0.83的值。第二部分手工翻译如上，希望帮到你。