简介:这研究检验多重排的垂直slotted防波提的水动力学表演。我们基于一个特徵函数扩大方法和一种最少的广场技术开发了一个数学模型为司烧秒顺序波浪。为限制双排和三倍排的墙的格获得的数字结果在对以前的研究的结果和试验性的结果的好同意。有思考,传播,和驱散系数的试验性的大小的比较(为双排墙的CR,CT,和CE)证明建议数学模型足够地复制大多数重要特征。我们发现为双排墙,有增加的CR增加挥动数字,kd,并且与减少可渗透的墙部分,dm。CT跟随相反的趋势。CE慢慢地为更低的kd价值与增加的kd增加,到达最大值,然后再减少。另外,dm的一个增加的孔将显著地减少CR,当增加CT时。在kd的更低的价值,一个减少的孔要不是kd的高价值增加CE,,一个减少的孔减少CE。数字结果显示为三倍排的墙,水动力学特征上的房间宽度的安排的效果不是重要的,除了当时kd<0.5。双排slotted防波提可以在kd展出好吸收波浪的表演>0.5,在由水平波浪力量可能比一个单身者的小的地方,围。在另一方面,双排之间的差别和三倍排的垂直slotted防波提是边缘的。
简介:Theconfigurationandaerodynamicperformanceoftheinletsystemareimportantaspectsintheprocessofinstallingagasturbineonanavalvessel.Undertherequirements,largeeddysimulation(LES)isusedtosimulatethethree-dimensionalfluidflowinthewaveblockerofamarineinletfilter.TheSmagorinsky-Lillysub-gridmodelwasusedtomodelmotionsofsmall-scalestructures.Duringnumericalsimulation,theSIMPLEalgorithmwasapplied.Thecentral-differencingspatialdiscretizationschemeandthesecondorderaccuracyfinitedifferenceforthetemporaldiscretizationwereused.Simulationgivessatisfactorydistributionofthevorticityfieldsandturbulentkineticenergy.Comparedwiththek-εturbulentmodel,theresultsofLESarebetterforthedistributionofparameters.Theresultsofexperimentalstudyinasmall-scalewindtunnelindicatethatnumericalcalculationhashigheraccuracy.Therefore,themethodsusedareworthyofreferenceandintroductionforthedesignofaninletsystem.
简介:Thepotentialbasedlowordersurfacepanelmethodisusedtopredictthehydrodynamicperformanceofmarinepropellers.Inpresentmethodthehyperboloidalquadrilateralpanelsareemployedtoavoidthegapbetweenthepanels.TheinfluencecoefficientsofpanelsarecalculatedbyMorino’sanalyticalformulationsforincreasingnumericallycalculatingspeed.Thepres-sureKuttaconditionissatisfiedonthetrailingedgeofpropellerbladebyNewton-Raphsoniterativeprocedure.Thereforethe
简介:WITElectronicFuelSystemCo.,Ltd.hasdevelopedanewfuelinjector,theElectronicIn-linePump(EIP)system,designedtomeetChina’sdieselengineemissionandfueleconomyregulations.ItcanbeusedonmarinedieselenginesandcommercialvehicleenginesthroughdifferentEIPsystems.AnumericalmodeloftheEIPsystemwasbuiltintheAMESimenvironmentforthepurposeofcreatingadesigntoolforengineapplicationandsystemoptimization.Themodelwasusedtopredictkeyinjectioncharacteristicsunderdifferentoperatingconditions,suchasinjectionpressure,injectionrate,andinjectionduration.Tovalidatethesepredictions,experimentaltestswereconductedundertheconditionsthatweremodeled.Theresultswerequiteencouragingandinagreementwithmodelpredictions.AdditionalexperimentswereconductedtostudytheinjectioncharacteristicsoftheEIPsystem.Theseresultsshowthatinjectionpressureandinjectionquantityareinsensitivetoinjectiontimingvariations,thisisduetothedesignoftheconstantvelocitycamprofile.Finally,injectionquantityandpressurevs.pulsewidthatdifferentcamspeedsarepresented,animportantinjectioncharacteristicforEIPsystemcalibration.
简介:新聚合物,有氧化(PSFN)的poly-silicon-ferric凝结剂被把KMnO_4和稳定器M加到poly-silicon-ferric(PSF)生产凝结剂。PSFN的微性质与光显微镜,传播电子显微镜(TEM),扫描的紫外/可见的吸收(UVA),infrared(红外)分光计和oxidation-reductionpotential(ORP)被调查米分别地,与PSF的相比。由PSFN的凝结行为被PSF与那相比调查。结果证明PSF的微性质由于KMnO_4的增加极大地被改变了,并且在那里存在在PSFN独立的KMnO_4。一种四面体结构可以被Mn的thecomplexation有点象Si-O-Si契约的连接一样形成(也许在各种各样的原子价)与PSF。PSFN在更低的剂量比PSF有更低的混浊移动并且当剂量到达明确的数量时,完成一样,当由PSFN的移动ofUV_(254)在有大约17%的最大的差别的全部剂量范围上几乎由PSF比那高时。PSFN让更多的氧化以基本状况比那以酸的状况工作,并且为由PSF比那对待各种各样的水给申请的更强壮的能力。
简介:这份报纸数字地在瞄准在多样的现实主义的学科改进它的适用性的一艘高速度三个船体并列的游艇(HST)的水动力学表演上调查悬臂梁的分离变化的影响。现在的调查在2-D的框架以内被执行由计算搬到深水的平静免费表面的三个对称的三个船体并列的游艇系列的抵抗的苗条身体方法(SBM)。每个三个船体并列的游艇系列4681包括认为151蹒跚产生的配置(50%+100%),和为81个弗鲁德数字的31分离(100%400%)(0.20Fn1.0)。在开发三个三个船体并列的游艇系列,Wigley?-st,AMECRC?-09,和NPL?-4a模型为两个独立被使用主要并且各单个的系列模型的方面壳。一个计算机宏说出Tri-PL吗?为应用程序用可视化Basic被创造?。Tri-PL?顺序连接的Maxsurf?然后Hullspeed?和他们的详细静水力学的详细规格产生三个三个船体并列的游艇系列的模型,由他们的抵抗部件列在后面。数字结果部分对可得到的出版数字计算和试验性的结果被验证,到基准Tri-PL吗?宏并且因此依靠分析结果。一个图模板在SigmaPlot的框架以内被创造吗?设想Tri-PL的重要结果?适当地。
简介:SomeconstructcharacteristicsandcomposingmaterialofthenewGyro'srotorareintroduced.Somefactorsresultingindeformationoftherotorsurfaceareanalyzed.Underdifferentloadssuchastheforceofdeflectingcenter,thechangeoftemperature,theforceofpressureandcouplefactors,thedeformationofrotorisanalyzedwiththewaveletfiniteelementsimulationsoftware.Thevectordistributingmapofrotorreformationisgiven.Thedeformationresultingfromthepressureforceofphotonisstudied.Finally,theinfluenceonGyro'sperformancebecauseofanomaloussurfaceofrotorduetodeformationofrotorisresearchedandtheresultisusefultoforecasttheperformanceofthedriftofgyroscope.Thedisturbingmomentresultingfromthedeformationofrotorcanbecompensatedusingthemathematicmethod,andprovidesanimportantreferenceforbothdesignandoptimizationoftherotor.
简介:Shipcollisionaccidentsarerareeventsbutposehugethreattohumanlives,assets,andtheenvironment.Manyresearchershavesoughtforeffectivemodelsthatcomputeshipstochasticresponseduringcollisionsbyconsideringthevariabilityofshipcollisionscenarioparameters.However,theexistingmodelswerelimitedbythecapabilityofthecollisioncomputationalmodelsanddidnotcompletelycapturecollisionscenario,andmaterialandgeometricuncertainties.Inthispaper,anovelframeworktoperformancecharacterisationofshipsincollisioninvolvingavarietyofstrikingshipsisdeveloped,bycharacterisingthestructuralconsequenceswithefficientresponsemodels.Adouble-hulloilcarrierischosenasthestruckshiptodemonstratetheapplicabilityoftheproposedframework.Responsesurfacetechniquesareemployedtogeneratethemostprobableinputdesignsetswhichareusedtosampleanautomatedfiniteelementtooltocomputethechosenstructuralconsequences.Theresultingpredictor-responserelationshipsarefittedwithsuitablesurrogatemodelstoprobabilisticallycharacterisethestruckshipdamageundercollisions.Asdemonstratedinthispaper,suchmodelsareextremelyusefultoreducethecomputationalcomplexityinobtainingprobabilisticdesignmeasuresforshipstructures.Theproposedprobabilisticapproachisalsocombinedwithavailablecollisionfrequencymodelsfromliteraturetodemonstratetherisktolerancecomputations.
简介:当引擎使用与纳米大小的添加剂Ce0.9Cu0.1O2和Ce0.9Zr0.1O2混合的重油时,这篇论文主要在高速度的柴油机引擎和排放减小的表演上学习。在测试期间,Indiset620燃烧分析器由AVL做了,被用来在柱体压力上做即时调查,燃料点火时刻,并且在柱体和曲柄角度建立在温度的变化趋势之间的一种关系。为烧与添加剂混合的重油和重油的引擎,燃烧分析软件Indicom和协奏曲被用来分析它的燃烧进程和排放条件。试验性的调查证明缩放nano的复杂氧化物能改进与重油,和还原剂造成的柴油机引擎的表演象NOx和公司一样的污染物质的排放,把它与纯重油作比较。根据这个实验的后果,添加剂在重油的使用改进全面表演。