1、-I-.,.t. . .FORAERONAUTICS . ,*.-TECHNICALNOTE .,No. 1545VIND-TUNNELINVESTIGATIONOF SEVENTHIN NACA AIRFOIL SECTIONITO DETERMINEOPTIMUMDOUBLE-SLOTTED-FLAP CONFIGURATIONSByJonesF. Cahill andStanleyLangley Memorial AeronauticalLangley Field, Va.F. -CiSZLaboratoryWashingtonApril 1948 - .+ ,- .-.:-NA CA
2、LIBRARY -LANGLEYMEMOIUALAERoNAuTlcA4MEOR.ATORYbngleyField.vProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I?JITIONALSORY COMMITTEEFORAERONAUTICSTIwhichthehighestrmxclmumliftcoefficientsweremeaswedwereabout50-to55fortheflapandabout25to39.fortheforefl
3、+p?_ . Themaximumsectionliftcoefficientofthearfoilsectionwith. eithera splitordoubleslottedflapdecreasedasthepositionofmimimumnressurewasmovedtotheresrorastheairfoilthicknesswasdecreasedto0.08chord.Inallcases,themaximumsectionlift2.4X d to6coefficintincreasedastheReynoldsnumberwasincreasedfrom.0X 10
4、6butgenerallydecreased$ remainedcnstanta.s. theReynoldsnumberwasincreasedfrom6.0X 1 (3tog.oxl . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 NAC!ATNNo.1545Increasingthefor-flapchordprovidedincreasesinthemaximumsectionliftcoefficientsofboththeNAC
5、A64-208andtheRACA6210 arfoilsectlonewithdoubleslottedflaps.Theadditionofatamdardroughnesstotheleadingedgesoftheairfoilsequippedwfthdoubleclottedflapsgenerallydecreaeedthemaximumsectioniii%coefficientsbyamountsslightlylessthanthoseobtainedwiththeflapsretracted,decreasedthevariationofthemaximumsection
6、liftcoefficientwithpositionofminhumpressureandwithairfoilthickness,andcausedthestallstobelessabruptthanthoseforthesmoothcondition.Theratioofincrementofsectionpitchi ntcoefficienttoincrent,ofsectionHft() 1.10slopeofradius throuxL.E.t 0.05NATIONALAOVISORYCONNITTE3FMUSONAVTKS-,.-Provided by IHSNot for
7、ResaleNo reproduction or networking permitted without license from IHS-,-,-Igper surrane_)tatlonIroimteI.E.lmlins.0.4low 21.002.00i:%2:%g:a 1.20on chord Mm)TML17orum+mg FOR o.loo-oHom mm pmionsand ordlmt glvm frcmfore-flapahordMm n pelmentdairfoil ohmMAT10t4uUMSDRYCoHmTm m hEamliTK5.1.IProvided by I
8、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- .-= - ?e ,.,.63-2M 0.25Cb fhP. q = 5l J+f =30”; R =2.4 .10$.:,IProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- - I2.8.?.h:.: 2.0 1 1 I*II L xa.8.4a -16 -8 0 8 16
9、.(a) off .2P; Of =5. Xl=2.30;71= 1.78;X2-2.17;T2= 1.23.3.22.8.4i 2.0 ,6g 1.2a.a-400 2.%.: b z$-. gza; “6 Dm0. -.84 -U -8 0 8 16 (+Omtlouanlaof*ttmk, , d,g UATIOIIUAWGOAY(b)Fi=6.OXII+, “w= 7.- *ocion lIfo- pltuhing+coent dmrmtorl-tiesM tboWA 63-210 drfoil saotion with a doubh dukted flcp.o.o rora flq
10、l; 0.2303 rlsp. o.Elz.r *Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*Eaatlon mgh orat-k, QU, W(.) Phbl *foil,0-.4211.atotiwULS20 of at-ok, EO, b6(b) A Om = 20?Pima9 C.ant.xmcuflap PX1 tion ror uxti l!ft d tlm IIACA0.07% fOPO fP; 0.25I CM. B = 2.4 x lb., ,Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.P /iProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
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