|
The Prandtl lifting-line theory〔Anderson, John D. (2001), ''Fundamental of aerodynamics'', McGraw-Hill, Boston. ISBN 0-07-237335-0. p360〕—also called the Lanchester–Prandtl wing theory—is a mathematical model that predicts lift distribution over a three-dimensional wing based on its geometry. The theory was expressed independently by Frederick W. Lanchester in 1907, and by Ludwig Prandtl in 1918–1919 after working with Albert Betz and Max Munk. In this model, the vortex loses strength along the whole wingspan because it is shed as a vortex-sheet from the trailing edge, rather than just at the wing-tips.〔Abbott, Ira H., and Von Doenhoff, Albert E., ''Theory of Wing Sections'', Section 1.4〕〔Clancy, L.J., ''Aerodynamics'', Section 8.11〕 ==Introduction== On a three-dimensional, finite wing, lift over each wing segment (local lift per unit span, or ) does not correspond simply to what two-dimensional analysis predicts. Instead, this local amount of lift is strongly affected by the lift generated at neighboring wing sections. As such, it is difficult to predict analytically the overall amount of lift that a wing of given geometry will generate. The lifting-line theory yields the lift distribution along the span-wise direction, based only on the wing geometry (span-wise distribution of chord, airfoil, and twist) and flow conditions (, , ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lifting-line theory」の詳細全文を読む スポンサード リンク
|