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：Fromthebeginningof1970’s,theresearchworkonstrandcurrentdistributioninhydro-generatorstatorbarshasbeenmademarkedprogressinChina.Inordertoknowwhythegeneratorbarinsulationswerebrokendownsooftenbothinop-erationandintestingafterthegeneratorsbeingputintooperationfor8-10yearsatXinanjiangHydropowerStation.Investigationswereconductedandtheresultsoffieldmeasurementshowedthatthe

简介：Undertheconditionofhigh-powerdrive,theexperimentalphenomenaoffreestatoroftravelingwaveultrasonicmotortakesonstrongnonlineareffects.Firstly,itscorrespondingtheoriesareestablishedtoanalyzeandcomparethestator'sperformancesattheresonanceandantiresonancestates.Atthesametime,someimportantparameters,suchasresonance/antiresonancefrequency,mechanicalquality,electro-mechaniccoupling,andtherelativevibrationeffect,areselectedelaboratelytoevaluatethevibrationalperformancesoffreestator.Then,someexperimentalschemesbasedonthelaservibrationmeasurementaredesignedrespectively.Underthedifferentdrivesconditions,theexperimentalcharacterizationsoffreestatorattheresonanceandantiresonancestatesareanalyzedsystematically.Finally,Theinvestigativeresultsshowthattheperformanceattheantiresonancestateismuchbetterthanthatattheresonancestate.Someconclusionsofthispapercanprovidenovelideaandguidanceforthechoosingoftheoperatingstatesanddrivingmodesoftravelingwaveultrasonicmotor.

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简介：Increasingtheaerodynamicloadoncompressorbladeshelpstoobtainahigherpressureratioinlowerrotationalspeeds.Consideringthehighaerodynamicloadeffectsandstructuralconcernsinthedesignprocess,itispossibletoobtainhigherpressureratioscomparedtoconventionalcompressors.However,itmustbenotedthatimposinghigheraerodynamicloadsresultsinhigherlosscoefficientsanddeterioratestheoverallperformance.Toavoidthelossincrease,theboundarylayerqualitymustbestudiedcarefullyoverthebladesuctionsurface.Employmentofadvancedshapedairfoils(likeCDAs),slottedbladesorotherboundarylayercontrolmethodshashelpedthedesignerstousehigheraerodynamicloadsoncompressorblades.Tandemcascadeisapassiveboundarylayercontrolmethod,whichisbasedonusingtheflowmomentumtocontroltheboundarylayeronthesuctionsurfaceandalsotoavoidtheprobableseparationcausedbyhigheraerodynamicloads.Infact,thefrontpressuresideflowmomentumhelpstocompensatethepositivepressuregradientovertheaftblade’ssuctionside.Also,incomparisontothesinglebladestators,tandemvariablestatorshavemoredegreesoffreedom,andthisissueincreasesthepossibilityoffindingenhancedconditionsinthecompressoroff-designperformance.Inthecurrentstudy,a3Ddesignprocedureforanaxialflowtandemcompressorstagehasbeenappliedtodesignahighlyloadedstage.Following,thisdesignisnumericallyinvestigatedusingaCFDcodeandthestagecharacteristicmapisreported.Also,theeffectofvariousstatorstaggeranglesonthecompressorperformanceandespeciallyonthecompressorsurgemarginhasbeendiscussed.TovalidatetheCFDmethod,anotherknowncompressorstageispresentedanditsperformanceisnumericallyinvestigatedandtheresultsarecomparedwithavailableexperimentalresults.

简介：合适的直角的分解方法在转子定子以内被用于即时速度地一台高速度的高压的离心的压缩机的内部排的区域。处理数据来自实验和数字模拟。与Fourier变换比较，POD为两块起始的地给最好的形式的近似，以在要考虑的模式的任何给定的数字上表示的精力：到速度地的活动范围98%全部的精力，邮政部门模式的要求的数字比Fourier泛音的数字低多达九倍。单个邮政部门模式被给并且证明不稳定的转子定子相互作用已经是在第一个模式的现在。关键词转子定子相互作用-合适的直角的分解-邮政部门

简介：Theresonancesofparametricvibrationwithforcedvibrationisanalyzed,thebifurca-tionequationofthesystemisobtainedandthesinsularityanalysisismade.Someofthelawsandphe-nomenaarerevealed.Thetransitionvarietyandbifurcationdiagramofthephysicalparametricplanearegiven.Theresultscanbeusedinensinecrins.

简介：Basedonthesuccessfuloperationof1200kWturbo-typemodelgeneratorwithseparatedevaporativecoolingofbothstatorandrotor,a50MVAturbo-typesynchronouscondenserwithevaporativecoolingstatorwasconstructedandputintoopera-tiononMarch8,1991atXijiaoSubstationofShanghaiPowerBu-reau.Thisisthefirstoneintheworldthatappliedtheevaporativecoolingtechniqueonturbo-generatorinindustrialscale.

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简介：Numericalmethodwasappliedtotheunsteadyflowsimulationatthemidspanofatwo-stagelowspeedcompressor,andthebladeboundarylayerflowunderrotor/statorinteractionwasinvestigated.Bythemodelofwake/boundarylayerinteractionprovidedinthispaper,thesimulatedbladefrictionalforceandtheboundarylayerturbulentkineticenergy,theinfluenceofwake/potentialflowinteractiononthebladeboundarylayerflowwasanalyzedindetail.Theresultsshowthatundertheconditionofrotor/statorinteraction,thewakeisabletoinducethestatorlaminarboundarylayerflowtodevelopintoturbulentflowwithinacertainrangeofwakeinteraction.Inthestatorsuctionboundarylayer,anundisturbedregionoccursbehindtherotorwake,whichextendsthelaminarflowrange,andthewakewithhighturbulentintensityhasthecapabilitytocontroltheboundarylayerseparationunderadversepressuregradient.