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简介：Thestabilityofthethinliquidfilminacapillaryisimportanttothephase-changeheattransferprocessinminiatureofmicrostructures.Fromthebasicequationsformotionandheattransferattheinterfaceofthefilm,itsstabilityistheoreticallystudied.Withevaluationoftheeffectsandrelativemagnitudesofvariousdrivingforcesandwiththeuseoflong-wavetheoryinadditiontolinearstabilityanalysis,thecontrollingequationsaresimplifiedandanevolutionequationforthefilm'sthicknessisobtained.Detailedanalysisontheevolutionequationshowsthatinstabilityoccursfirstinthemeniscusregionandtheinstabilityconditionvarieswithboundaryconditions,geometricalscalesandthermalproperties.Thenumericalresultsagreewellwithearlieroneswithsomefavorableextensionsandimprovements.

简介：Thepinchpointisimportantforanalyzingheattransferinthermodynamiccycles.Withtheaimtorevealtheimportanceofdetenniningtheaccuratepinchpoint,theresearchonthepinchpointpositioniscarriedoutbytheoreticalmethod.Theresultsshowthatthepinchpointpositiondependsontheparametersoftheheattransferfluidsandthemajorfluidproperties.Inmostcases,thepinchpointlocatesatthebubblepointfortheevaporatorandthedewpointforthecondenser.However,thepinchpointshiftstothesupercooledliquidstateinthenearcriticalconditionsfortheevaporator.Similarly,itshiftstothesuperheatedvaporstatewiththecondensingtemperatureapproachingthecriticaltemperatureforthecondenser.Itevencanshifttotheworkingfluidentranceoftheevaporatororthesupercriticalheaterwhentheheatsourcefluidtemperatureisveryhighcomparedwiththeabsorbingheattemperature.Awrongpositionforthepinchpointmaygenerateseriousmistake.Inbrief,thepinchpointshouldbefoundedbytheiterativemethodinallconditionsratherthantakingforgranted.

简介：InfraredabsorptionmeasurementsshowedthatthesamplesbelongtotypeIavarietyofdiamondandcontainedvaryingconcentrationsofAandBfromsofnitrogenaggregatesaswellasplatelets.Thesynchrotronradiationwasemployedtostudythestructureofthesespecimens.Growthbandsareobservednearthecenterofthecrystalssituatedwithin(001)and(010)planesinhighcrystallinequalitydiamondsandthegrowthbadsparallelto(100)and(010)cyrstallineplane.Intheimperfectcystalslow-angleboundariesareobservedandtheanglesweredeterminedtobelargerthan2.5degrees,Theperfectionofdiamondcrystalshasnoobviousrelationshipwiththeconcentrationofnitrogen.

简介：这份报纸报导巨浪的试验性、理论的学习发生在原型一台极端微离心的压缩机。作为第一步，10次缩放有40公里的一台极端微离心的压缩机的模型外部直径被设计并且生产。为有B参数的几不同价值的巨浪的短暂行为的详细试验性的调查被执行。试验性的结果在巨浪期间与非线性的lumped参数理论获得以便为微离心的压缩机验证理论巨浪模型的有效性的那些相比。作为结果，巨浪的相当不同的行为在实验并且在分析为B的不同价值出现了。关键词微离心的压缩机-澎湃-lumped参数模型CLC数字TK474.8+2

简介：ThecombustionreactivityofricehuskfromNewSouthWales,ustraliawasmeasuredbyheatingcubicalbasketsincontrolledenvironmentandmonitoringthecentretemperature.Frank-Kamenetskii'signitiontheorywasusedtocalculatetheactivationenergy,Resultsagreedwellwithtestsonothercellulosicmaterials,Numericalsimulationsoftemperaturechangeswerecarriedout,usingaspecialtechniquetodealwithnon-linearitiesintheheatconductionequation.ThenumericalResultsindicatethatthetimefactorshouldbetakenintoaccountwhenevaluatingself-combustionrisks.

简介：Inthispaperresultsofpreviousresearchesoftwo-modefullenginemodelforMachnumberrangefrom3to6arepresented.Themainaimsofresearchesaretoobtaincharacteristicsoffullenginemodelanditscomponents(theinlet,thecombustionchamberandthenozzle)inramjetandscramjetregimesandtocomparethesecharacteristicswiththecalculationresultsaccordingtoCFDandtoapproximate(engineering)methods.Testswerecarriedoutwithoutfuelsupply(coldtests)andwithfulelsupply(studyofignitionandcombustion).Hydrocarbonandhydrogenfuel(gaseousorliquid)wereusedduringthetests.

简介：TheS2flowpathdesignmethodofthetransoniccompressorisusedtodesigntheonestagefaninordertoreplacetheoriginaldesignedbladecascadewhichhastwo-stagetransonicfanrotors.Inthemodificationdesign,thecamberlineisparameterizedbyaquarticpolynomialcurveandthethicknessdistributionofthebladeprofileiscontrolledbythedouble-thricepolynomial.Therefore,theinletflowhasbeenpre-compressedandthelocationandintensityoftheshockwaveatsupersonicareahavebeencontrolledinordertoletthenewbladeprofileshavebetteraerodynamicperformance.Thecomputationalresultsshowthatthenewsinglestagefanrotorincreasestheefficiencybytwopercentatthedesignconditionandthetotalpressureratioisslightlyhigherthanthatoftheoriginaldesign.Atthesametime,italsomeetsthemassflowrateandthegeometricalsizerequirementsforthemodificationdesign.

简介：ThispaperreportsonanexperimentalandnumericalstudyatlowReynoldsnumberinordertoevaluatetheinfluenceoftheCoriolisforcesontheflowinradialrotatingchannels.Operatingconditionscorrespondtotheflowinradialimpellersformicrogasturbineapplications.AcomparisonofdetailedflowmeasurementswithCFDresultsindicatesthatNavierStokessolverswithstandardk-ωandSSTturbulencemodelspredicttheflowsurprisinglywellandthatnoextracorrectionsforCoriolisforcesarerequiredattheseoperatingconditions

简介：试验性的调查为斜流动扇子的定子的内部流动被进行。中心表面和定子片的吸表面附近的角落分离上被集中。以设计流动率，在定子插头减少的轴的速度和全部的压力的价值接近吸表面在在由角落墙的影响的中心表面附近。以设计流动率的8090%的低流动率，表面能被发现的在吸表面和中心之间的角落分离，它广泛地变得在设计流动率的80%传播了。

简介：Thehomogeneousnucleationwithsubsequentspontaneouscondensationofwater,pentanol,andethanolvaporsinacarriergasareinvestigatedexperimentallyandtheoreticallyintheexpansionpartofashocktube.TheprecisepressureandMCWmeasurementsgiveadditionalinformationaboutthewetness,sothatthenucleationandcondensationrateswhicharecloselycoupledforstrongerexpansionratesaredetermiedmoreaccurately,Predictionsoftheprincipleoftheminimumofentropyproductionarecomparedwithexperimentsperformedforwater,ethanolandpentanolatdifferentpressures.

简介：Mechanicalandphysicalproperties,suchastensilestrength,elongationatbreak,modulusofelasticity,ShoreDhardness,meltflowrate(MFR),andelectricalandthermalconductivitiesofcompositeswithhighdensitypolyethylenematrixreinforcedwithAlpowderswereinvestigatedexperimentally.Measurementsofthemechanicalandphysicalpropertieswereperformeduptoareinforcingcomponentconcentrationof30%volumeAlpowderandcomparedwithmathematicalmodelsfromtheliterature.Theobtainedresultshaveshownthatexperimentaldatawereingoodagreementwiththeoreticaldata.Theultimatetensilestrength(UTS)andelongationatbreakdecreasedwithincreasingAlpowdercontent,whichwasattributedtotheintro-ductionofdiscontinuitiesinthepolymerstructure,andmodulusofelasticityincreasedwithincreasingAlcontent.Thecompositepreparationconditionsallowedtheformationofarandomdistributionofmetallicparticlesinthepolymermatrixvolumeforsystemhighdensitypolyethylene-Al(HDPE-Al).TherewasaclusterformationofAlparticlesathigherAlcontentsinthepolymermatrix.ElectricalandthermalconductivityvaluesofHDPE-AlcompositeswerehigherthanpureHDPEvalues.

简介：当前的纸论述试验性、计算的结果在一台压缩机估计non-axisymmetricendwallcontouring的有效性线性串联。endwall被一个endwall设计优化平台在0o发生(设计条件)设计。优化方法基于一个基因算法。设计目的是最小化全部的压力损失。实验与0.15的一个马赫数字在一台低速度的测试设备在压缩机串联被执行。四个名字的入口流动角度被选择测试non-axisymmetricContouredEndwall(CEW)的表演。有2公里的一条头直径的一根五洞的压力探针被用来穿越flat-endwall(很少)的下游的流动地，CEW串联。两个都，测量并且预言的结果显示CEW的实现导致全部的压力损失的更小的角落货摊，和减小。CEW得到15.6%全部的压力损失系数减小在设计状况，并且22.6%在离开设计调节+7o发生)。并且CEW的改进的机制基于测量了并且计算结果是不利压力坡度(APG)在吸表面(SS)的前缘(LE)附近通过沟配置被减少了。

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简介：高效率的优点，低SFC(特定的燃料消费)，超离频绕过比率扇涡轮引擎吸引越来越多的注意在现代广告引擎。中间的汽轮机管(ITD)它高连接有低压力的压力汽轮机(HPT)汽轮机(并行口)，由指导流动没有太多损失，从HPT来到并行口在汽轮机的全面表演上有批评影响。因此，掌握设计好攻击的、甚至超级好攻击的ITD的技术变得越来越迫切。更多担心被专注于管。然而，改进汽轮机以便推进，并行口嘴被排列成ITD弄短低压力轴。与如此的设计概念，那块并行口嘴流动地被在上游的管结构容易影响，是明显的，但是相反收到少得多兴趣。在这份报纸，数字方法被用来调查一些ITD的效果与在上游打漩并行口上的片嘴。有一样的九个模型打漩并且嘴片当ITD的长度是唯一的时要换掉的参数，将被讨论。最后，为设计者的几个结论和忠告被总结。在改变管，入口和插头的轴的长度以后，嘴的流动地相应地不同。在另一方面，表面介绍的嘴片(吸和压力)上的砍的压力在各种各样的入口流动下面的单个特征。除了那，像计时的效果在这份报纸被描述，它将贡献大部分到压力损失并且应该被付足够的注意。

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简介：Thispaperpresentsanewapproachtostudytheprocessofcoalgasification.Non-linearprogrammingtechniquesareusedtodeterminethevalueofthemodelparametersthatdependsoncoalspeciesandexperimentalconditionsandthusminimizethedifferencebetweenexperimentalresultsandmodelpredictions.Modelpredictionsbeingingoodagreementwiththeexperimentalresultsshowthatthismethodofcombiningmodelwithexperimentiseffectiveformodelingcomplexprocesses.

简介：基于DCA机翼的一个原型和10%弦的轴的排水量重叠，七种正切的排水量被拿与数字方法在双人脚踏车串联模仿流动条件与高效选择更好的几何学。有正切的排水量b/t=0.83的配置将比其它获得更好的流动性能。在这个基础上，有正切的排水量b/t=0.67的二种配置并且0.83在几种配置之中被选择由使用TR-PIV系统即刻地捕获流动速度拿进试验性的调查。有b/t=0.83的配置被观察更好的流动地表演比b/t=0.67。它在差距地区的注射流动强壮得多，弄醒前面的地区区域并且高耸片更小，溪流流动是改进的更多。它证明在试验性的调查的流动表演相当在数字结果预言的一样的趋势。

简介：ThermalcharacteristicsarenumericallyinvestigatedforthehybridAlGaInAs/InPonsiliconmicroringlaserswithdifferentringradiiandwidths.Lowthresholdcurrentandlowactiveregiontemperatureriseareexpectedforamicroringlaserwithanarrowringwidth.Basedonthethermalanalysisandthe3Dsimulationformodecharacteristics,ahybridAlGaInAs/InPonsiliconmicroringlaserswithaninnern-electrodelaterallyconfinedbythep-electrodemetalliclayerisfabricatedusinganadhesivebondingtechnique.Athresholdcurrentof4mAisachievedforahybridmicroringlaserwitharadiusof20μmandaringwidthof3.5μmat12°C,andthecorrespondingthresholdcurrentdensityisaslowas1kA∕cm~2.Theinfluenceofthelocationofsiliconwaveguideonoutputperformanceisstudiedexperimentallyforimprovingtheoutputcouplingefficiency.Furthermore,continuous-waveelectricallyinjectedlasingupto55°Cisrealizedforahybridmicroringlaserwitharadiusof30μmandaringwidthof3μm.