MAE2_Lecture5

MAE2_Lecture5 - Airfoils Nomenclature Coefficients Airfoil...

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Airfoils Nomenclature Coefficients Airfoil Data Critical Mach Drag-Divergence Mach Wave Drag Drag Summary MAE 2 NASA Image
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2 MAE 2 Airfoil Nomenclature The cross-sectional shape of a wing (or tail surface) is called an airfoil . Chord Line Chord (c) Thickness Mean Camber Line Camber Airflow Leading edge Trailing Edge
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3 MAE 2 Lift and Drag The angle-of-attack is defined as the angle between the airfoil chord line and the relative wind direction. Lift is perpendicular to the relative wind and drag is parallel. Chord Line Airflow = angle of attack c/4 L = Lift D = Drag M c / 4 = Moment about quarter chord
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4 MAE 2 Aerodynamic Coefficients Aerodynamic forces and moments are converted to non-dimensional coefficients so that comparisons can be made between airfoils (and airplanes). Coefficients are defined to break dependent variables into convenient groupings. c l = f 1  , M , Re c d = D q S c m = M q S c c l = L q S c d = f 2  , M , Re c m = f 3 
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MAE2_Lecture5 - Airfoils Nomenclature Coefficients Airfoil...

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