lectures-chapter5

lectures-chapter5 - 650:460 Aerodynamics Chapter 5 Prof....

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Unformatted text preview: 650:460 Aerodynamics Chapter 5 Prof. Doyle Knight Tel: 732 445 4464, Email: doyleknight@gmail.com Office hours: Tues and Thur, 4:30 pm - 6:00 pm and by appointment Fall 2009 1 Aerodynamic Forces and Moments There are two types of forces acting on an aerodynamic body Pressure Shear Pressure acts normal to the surface Shear acts parallel to the surface Potential flow can predict pressure forces only since viscous effects are neglected We shall examine the conditions where potential flow yields accurate prediction of aerodynamic forces and moments Fig. 5.1 2 Aerodynamic Forces and Moments Definitions Angle of attack Lift L Drag D Thrust T Normal force N Resultant force R Center of gravity cg Fig. 5.2 3 Aerodynamic Forces and Moments The aircraft is trimmed when the sum of the moments about the center of gravity is zero summationdisplay M cg = 0 The principal contributions to the pitching moment are Lift on wing Lift on tail Fig. 5.3 4 Aerodynamic Forces and Moments Axes Longitudinal x Lateral y Vertical z Aerodynamic moments Roll L Pitch M Yaw N Fig. 5.4 5 Aerodynamic Forces and Moments Parameters governing aero- dynamic forces Geometry and size Angle of attack U Reynolds number Mach number M = U / a Fig. 5.4 6 Airfoil Geometry Parameters Chord c Chord line Mean camber line Maximum camber Maximum thickness Leading edge radius Fig. 5.5 7 Wing Geometry Wing planforms Rectangular Unswept trapezoidal...
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lectures-chapter5 - 650:460 Aerodynamics Chapter 5 Prof....

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