1、/-II!III1/,THENATIONALADVISORYCOMMITTEEFORAERONAUTICSTECHNICALNOTENo. 1773EFFECTSOFVARIATIONSIN REYNOLDSNUMBERBETVLEENx 106AND25.0 x 106UPONTHEAERODYNAMICCHARACTERISTICSOFA NUMBEROFNACA6-SERIESAIRFOILSECTIONSByLaurenceK. Loftin,Jr., andWilliamJ. BursnallLangleyAeronauticalLaboratoryLangleyField, Va.
2、Washington ,.Decemkr 1948y:v- -. - - . ,- . . . . . . . . .- - ,- ,.-, .Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TECHLIBRARYKAFB,NMIlllllllllulllllllllln!illJ44+i7”-”-”NATIONALADVISORYCOMMMTEEFORAERONAUTICS“TK!HNIC!ALIioTENo. 1773THEEFFECTSOFV
3、ARIATIONSINREYNOLDSNUMBERBETWEEN3.0 x d m 25.0 x 3.06mm m AERODYNAMICCHARACTERETICSOFANUMBEROFNJICA6mRuBmm slmmomByIaurenceK.kin, Jr.,andUillim “J.BursnallResultserepresentedofantivestigationmadetodeterminethetwo-dimensionalliftenddragchmacterikticsofnineNACA6-seriesairfoilsectionsatReynoldsnuuibers
4、of1.Ox 106, 20.0 x 106, and25.O x 106.AlsopresentedaredatafromNACARep.No.824forthesamea=oilsatReynoldsnuuibersof3.0 x 106,6.o x 106,and9.0x 106. Theairfoilsselectedrepresentsectionshayingvariatiointheairfoiltihiclmess,thicknessform,andcember.Thecharacteristicsofenairfoilwithasplitflapweredeterminedi
5、noneinstance,aswastheeffectofsurfaceroughness.Qualitativeexplanationsh termsofflowbehaml.orareadvancedfortheobservedtypesofscaleeffect.lllI!ROl?UCTIONTwO-imlensionalaerodmkc dataobtainedatRe.mold.snu : _ _.-,Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
6、S-,-,-NACATNNO. 1773 5.agradualdecreaseoftheminimumdragcoefficientwithReynoldsnuderwtthinthatrangewherethe remainedymcticallyconstantforthethinnersections.5s decreasecontinuesuptoaReynoldsmmiberof10.0x 106forthe12-yercent-thicksectionandupto15.0X 106fortheNAM 633-oMairfoil,ef%erwhichthedragincreases
7、withfurtherincreaseinReynoldsnmiber.Ascon-ted tothethhmerairfoils,theflowconditionsofthethickerairfoilsareseentobemorefavorablefordelayingtheforwardmovementoftransition.Aninspectionofthepressuretherefore,mustbedeter-minedfromdatacorrespondingtotheoperatingRejnoldsnuniberoftheapplication.LengleyAeron
8、auticalLaboratoryNationalAdvisoryCammitteeforAeronautics “ey Field,Va.,October13,1948.$. ._ ._. . . . . _= _ -. - -.- _ _ _ _ _.- ,.- _+_ -. ._ -. . _Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-14 NACA NO.17731.Abbott,ha H.,VonDcenhoff,Alber-tR.,
9、andStivers,IauiaS.,Jr.:SummeryofAirfoilData.NACARep.No.824, 1945.2.VonDoenhoff,AlbertE.,andAb30ti,FraIkonaIow-llragAirfoil.NACACB,Nov.lg42.8. Pinkerton,RobertM.: CalculatedendMeasuredPressureDistributionsovertheMidEpanSectionoftheN.A.C.A.4412Airfoil.NACARep.NO.563,u36.9. VonDoenhoff,AlbertE.,andTete
10、rvin,Neal:DetenationofGeneralRelationsfortheBehaviorofTurbulentBounderyLayers.NACARep.No.772,1.943. -.- =. = . ,-., ,.T .,., .,-.-. ,“IHgure l.- Aermamtc c.hmmteritiios of the - 6= .tiobioneagleofatteok,Co, (II) IJft charmteriioe with 0.20c eiimil_atit flap defleoted 60”.Figure2.-Ccmtei.Provided by
11、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-R,;-;,:,;JII(c)Drag ch.macteridlce.Figure2.-wdma.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-0-; :11+oi.0Al .0,Vi?.0v25.o. -*ObiCUI 8E0 of atiok, , ,dy ,., (a)L
12、ift oharaoterietioa. Hgllre.3.-&rnenic charaoterlstlcsol?thelWCA,. 63Q09airfoflsection.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,“.1t.“tI. .IProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Fre
13、4,-Aeraiynamiccharacteristicsof theCA 631-ouamofl secti.M,r, , ,.!,., .-,., .,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,.I,.,.I:., ,8WOtlon Ilm Oeflioil)b, q ,. 9aotf0ulift 008ffiulmlb, a,(b)Dragche.raoteristios.Figure4.conolud.e&., .Provided
14、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Ii.i -I1t (a) IiMt oharaotmri6tics.Figure5.-Aercnamiooharaoteriaticm?theNMW 631-2Mairfoilsection. -uProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-B8ntlon Mb o
15、oefflolent, .sl(b)CragFiguremalb.-(hmluded. .,.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,.,(a)Liftoharacteriatics.igure6.hrodyaamiccharaoteriaticaortheNMMProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
