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CFD方法在流体机械设计中的应用 为了计算低速到超音速的无粘和粘性流动,综合CFD方法当前的研究成果,编制了CFD通用程序并且应用于流体机械的分析与设计。几个实例表明,该程序是有效的,具有较高的工程应用价值。 CFD方法 流体机械 设计 1 ,(、)。,,。,,,。,。、。、、,,,。,,,,———(CFD:ComputationalFluidDy-namics)。,、、,CFD,、、,CFD“”。CFD、、、。,、、。CFD,、、、、,。,,CFD,、,,。,CFD,、,,,,CFD。,,CFD。,,CFD,,22 2000283:1999—10—08,。2 CFD2.1 数学模型、,、。,,,。,。。,,。、,Navier-Stokes,:ΓWt+FCiξi-FViξi=0,FCi、FVi,[1];W=[p,u,v,w,T]T;Γ,[2]。2.2 计算方法2.2.1 。AUSMPW+[3]。。2.2.2 ,,,。YoonJameson[4]Lu-SGS,,,。,CFD。3 ,。1。?1 4 ,,,。4.1 圆弧凸包通道流动HC1,3,TC=0.1,97×49。0.2,2。,。。2 4.2 叶栅内部流动4.2.1 ,,3。3 23Vol.28,No.3,2000 FLUIDMACHINERY4.2.2 。0.5、0.675、1.6,、。,,4。[5],。,,,。4 4.3 拉伐尔喷管内部流动(M0.2～2.0),[6]2,B1B2,,B2B1。,2,2。,[6]B1B2,。[6],97×61,。5 6 24 2000283B1B2,45。,,B1B2。5 、,,,,。1 ,,..:,19882 ..:,19863 KyuHongKim,ChongGamKim,OhHyunRho.Accu-rateComputationsofHypersonicFlowsUsingAUSM-PW+SchemeandShock-aligenedGridTechnique,AIAApaper98-2442,19984 YoonS,JamesonA.Lower-UpperSymmetric-Gauss-SeidelMethodfortheEulerandNavier-StokesEquations.AIAAJournal.1986;24:1453～1460.5 ParkTS,KwonJH.AnimprovedMultistageTimeSteppingforSecond-OrderUpwindTVDSchemes.Computer&Fluids,1996;25(4):629～645.6 MasonML,PutnamLE,ReJ.TehEffectofThroatContouringonTwo-DimensionalConverging-DivergingNozzleatStaticCondition.NASATN-1704,1980 :,,32,,。:710049。轴向掠叶片对涡轮静叶栅流场气动及声学特性的影响 通过数值模拟计算了采用轴向前掠、后掠及径向三种不同叶片型式的涡轮静叶栅流场,并根据计算结果分析了各流场流动参数沿流向、径向的分布特点,以及轴向前掠涡轮叶栅降噪增效、轴向后掠叶片恶化涡轮静叶栅气动及噪声特性的根本原因。 轴向掠叶片 静叶栅 气动—声学性能 、,。,。[1],,。—[2,3],、,,,,。,—,,,。、,,—25Vol.28,No.3,2000 FLUIDMACHINERY:1999—10—25reasonsforfailure,improvedesignCFDTechniquesforDesignofFluidMachinery ZaoXingyanetal(22……………………………)AgeneralCFDcodescombiningtherecentachieve-mentsofCFDtechniquesisdevelopedinordertocom-puteinviscidandviscousflowsfromlowspeedtosuper-sonicThepresentcodeisappliedtotheanalysisandde-signoffluidmachinery.Resultsofseveralexamplesindi-catedthatthepresentcodeisattractedforengineeringapplications.Keyworeds:CFDtechniques,fluidmachinery,de-signEffectsoftheAxialSweptBladeonAerody-namice-AeroacousticPerformancesoftheTurbineStatorFlowYangAilingetal(25…………………)Anumericalinvestigationiscarriedouttostudytheeffectsoftheaftandforwardswepttechnologyonareody-namic-areoacousticperformacesoftheturbinestatorflow.Basedonthenumericalresultsofthestatorflowswithaftswept,forwardsweptandunsweptblades,thedistributionsalongaxialandradialdirectionsofflowvariablesaregiven.Theanalysisindicatedthatthefor-wardsweptstatorhadlowtotalpressurelossesandanimprovedacousticperformancecomparedwiththeun-sweptstator.Thedataalsoshowedthattheaftsweptbladedeterioratedtheareodynamicandareoacousticper-formaceofthestatorflow.Keywords:sweptblade,statorflow,areodynamic-areoacousticperformanceStressAnalysisofPlateandFrameFilterPress,ChamberFilterPresswithLargeSize TanWeietal(30………………………………)Stressanalysisarepresentedforthemaincompo-nentssuchasthrustplateassemblies,pressingplateas-sembliesandoilcylinderseatsusedinlarge-sizedframeorchambertypefilterpressesbythefiniteelementmeth-od.Thesestudiesformedabasisfordesignandmanufac-tureoflarge-sizedfilterpresses.Keywords:filterpress,finiteelementmethod,stressanalysisReviewontheErosionResearchofGas-SolidFlowTurbomachineryYouZhenjiangetal(33……)Recentstudydomesticandoverseasontheerosionofgas-solidflowturbomachineryisreviewed,includingcomputationforerosionresearchonimpellerinnerflow,mechanismandprinciplesofbladeerosionandoptimaldesignagainstit.Researchtrendinfutureisalsofore-casted.Thisreviewcanbeareferenceandguidancetorelativeprojects.Keywords:gas-solidtwophaseflow,turbomachin-ery,erosion,reviewPumpsfortheHemodialysissystem WuQinetal(41…………………………………)Thecharacteristic,structureandfunctionofthepumpsusedinthehemodiolysissystemareintroduced,anditproposedthatthemanufacturerorresearchunitdevelopthiskindofpumpanditsmotorforthehemodi-alysissystemtomeettheneedsofthehospitals.Keywords:hemodialysissystem,bloodpump,gearpumpTheCascadeControloftheInletTemperatureoftheRefrigeratingCompressor HuJianping(46…………………………………)Theperformanceoftheinlettemperatureareana-lyzed,thecascadecontroltechnologyareadoptedbyre-gardingthepressureofthesecondrefrigeratorasthevice-adjustmentparameter.Thecontrolsystemnotonlyweakensthecouplingsamongtheprocessparameters,butalsoquicklyconquerstheseconddisturbance.Itcanquicklyandstablycontroltheinlettemperatureofthere-frigeratingcompressor.Keywords:inlettemperature,cascadecontrol,sys-temsimulationStudyandAnalysisonAir'sWet-bulbTemper-atureWuXiping(60………………………………)Theevaporationofthewaterinnatureandthechangeofair'shumidityratioinadayhavebeenstud-ied,alsothechangelawoftheair'swet-bulbtempera-tureandthesimpleformulaforitscalculatinghavebeendeduced.Keywords:entyalpy,humidityratio,dry-bulbtem-peraturewet-bulbtemparature4 2000283