NASA NACA-TN-1545-1948 Wind-tunnel investigation of seven thin NACA airfoil sections to determine optimum double-slotted-flap configurations《测定最佳双开缝襟翼结构的7个薄NACA翼剖面的风洞研究》.pdf
《NASA NACA-TN-1545-1948 Wind-tunnel investigation of seven thin NACA airfoil sections to determine optimum double-slotted-flap configurations《测定最佳双开缝襟翼结构的7个薄NACA翼剖面的风洞研究》.pdf》由会员分享,可在线阅读,更多相关《NASA NACA-TN-1545-1948 Wind-tunnel investigation of seven thin NACA airfoil sections to determine optimum double-slotted-flap configurations《测定最佳双开缝襟翼结构的7个薄NACA翼剖面的风洞研究》.pdf(76页珍藏版)》请在麦多课文档分享上搜索。
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
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