Chapter 4 Incompressible Flow Over Airfoils Of the many problems now engaging attention, the following are considered of immediate importance and will be considered by the committee as rapidly as funds can be secured for the purpose. . The evolution of the more efficient wing sections of practical form, embodying suitable dimension for an economical structure, with moderate travel of the center-of-pressure and still affording a large range of angle-of- attack combined with efficient action From the first annual report of the NACA 1915
Chapter 4 Incompressible Flow Over Airfoils Of the many problems now engaging attention, the following are considered of immediate importance and will be considered by the committee as rapidly as funds can be secured for the purpose…. The evolution of the more efficient wing sections of practical form, embodying suitable dimension for an economical structure, with moderate travel of the center-of-pressure and still affording a large range of angle-of- attack combined with efficient action. From the first annual report of the NACA, 1915
4 1 Introduction ELudiwig Prandtl and his colleagues at Gottingen,Germany, showed that the aerodynamic consideration of wings could be split into two parts (1)the study of the section of a wingan airfoil And(2) the modification of such airfoil properties to account for the complete, finite wing
4.1 Introduction Ludiwig Prandtl and his colleagues at Göttingen, Germany, showed that the aerodynamic consideration of wings could be split into two parts. (1) the study of the section of a wing—an airfoil. And (2) the modification of such airfoil properties to account for the complete, finite wing
Definition of airfoil Airfoil section
Definition of airfoil
oThe purpose of this chapter Present theoretical methods for the calculation of airfoil aerodynamic properties. Y Road map of this chapter
The purpose of this chapter: Present theoretical methods for the calculation of airfoil aerodynamic properties. Road map of this chapter
4.2 Airfoil nomenclature Leading edge Thickness Mean cam ber line Cam ber Chord line chord- Trailing edge Leading edge:前缘 trailing edge:后缘 Chord line:弦线 chord length:弦长 7 hickness:厚度 camber 弯度 Mean chamber line:中弧线
4.2 Airfoil nomenclature Leading edge: 前缘 trailing edge: 后缘 Chord line: 弦线 chord length: 弦长 Thickness: 厚度 camber: 弯度 Mean chamber line: 中弧线