2018/3/11 Wing Geometry Parameters 图上活大学 Choosing Wing Geometry Parameters 国上清大学 Wing plan form geometry with straight taper and cranked trailing edge ·Wing Area Ensine ·Span selection Sweepback angle (quarter chord sweep) ·Root Chord process Centrline hord o ·Tip Che Wing ·Aspect Ra area Tip Taper Ratio :chord ·Sweepback Angle (C) Area A=Area B Wing Span Sweepback Aircraft centre line Wing semi-span(b/2)） airfoils For given gross wing area (S).the planform is decided by: ·aspect ratio(b/9 planform ·taper ratio(C-/C) weepback (at 1/4chord,or at Leading Edge) Wing eometrv 2017-2018 43 Mean Aerodynamic Chord (MAC) 国上活美大坐 MAC of Trapezoidal Wings 园上活道大整 Mean aerodynamic chord is the chord of an airfoil,located at MAC of trapezoidal wings can be determined using the following some distance from the centreline,as defined by methods Area centroid )of semispan wing can be computed by 2 MeanAgrodynamic Chord (e) 025e 2 C go 0+1+） 自+2) 61+a rAer 8oa6o0e四k-a88 Lift on a three-dimensional wing 国上洋大坐 Span wise Lift Coefficient Distribution 园上海发大坐 2-D Lift Distribution Different Re,chord length,AoA 0 Section Cu 3-D Lift Distribution Wing spanwise station wing Tip 47 82018/3/11 8 © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 Wing Geometry Parameters 43 For given gross wing area (S), the planform is decided by: • aspect ratio (b2 /S) • taper ratio (CT /CR) • sweepback (at 1/4chord, or at Leading Edge) Centreline chord (CR ) Sweepback angle (quarter chord sweep) Wing semi-span (b/2) Tip chord (CT ) Area A = Area B Aircraft centre line wing quarter chord line Wing plan form geometry with straight taper and cranked trailing edge © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 Choosing Wing Geometry Parameters • Wing Area • Span • Root Chord • Tip Chord • Aspect Ratio • Taper Ratio • Sweepback Angle Engine selection process Wing Aspect area ratio Wing Span Taper ratioSweepback angle Wing planform airfoils Wing geometry © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 Mean Aerodynamic Chord (MAC) • Mean aerodynamic chord is the chord of an airfoil, located at some distance from the centreline, as defined by • Area centroid (形心)of semispan wing can be computed by c dz S c b z   2 0 2 2 czdz S z b z c    2 0 2 © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 MAC of Trapezoidal Wings • MAC of trapezoidal wings can be determined using the following methods © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 Lift on a three-dimensional wing 47 b c V 2-D Lift Distribution 3-D Lift Distribution © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics, 2017-2018 Span wise Lift Coefficient Distribution • Different Re, chord length, AoA Wing spanwise station Wing Section lift coefficient