By William Frederick Durand
Dieser Buchtitel ist Teil des Digitalisierungsprojekts Springer booklet information mit Publikationen, die seit den Anfängen des Verlags von 1842 erschienen sind. Der Verlag stellt mit diesem Archiv Quellen für die historische wie auch die disziplingeschichtliche Forschung zur Verfügung, die jeweils im historischen Kontext betrachtet werden müssen. Dieser Titel erschien in der Zeit vor 1945 und wird daher in seiner zeittypischen politisch-ideologischen Ausrichtung vom Verlag nicht beworben.
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Extra resources for Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics
25. Flow along a wavy surface. distribution of pressure, a fact which however does not prevent the possibility of comparatively extensive variations depending on the shape of the airfoil (see Figs. 21 and 22). It is important in practice to know how specific alterations of the pressure distribution can be produced by suitable choices of airfoil profiles. The simplest rule in this connection is obtained by regarding the pressure and suction (sub-pressure) respectively at the surface of the airfoil as produced by the centrifugal forces of the air currents streaming by in curved paths.
14). , Messungen an rotierenden Zylindern. Ergebnisse der Aerodynamischen Versuchsanstalt zu G6ttingen, IV. , p. 101 (Oldenbourg, Munich, 1932). 2 For the calculation of the drag from the turbulent wake in accordance with Betz' procedure, see Division G 28, 29. Aerodynamic Theory IV 2 18 J 1. GENERAL PROPERTIES OF THE WING than in the potential flow; the consequence is that neighboring streamlines are rather more separated than in pure potential flow. In consequence of the unsymmetrical arrangement of the turbulence at the wing, the separation between the stream-lines is greater on the upper than on the lower side.
Wie8. = due to the formula of Wieselsberger. 9. Distribution of Pressure. The distribution of pressure over the surface of a wing is of the utmost importance for the drag, and above all for the maximum lift. As already emphasized in the discussion on maximum lift (see 3), as the pressure increases, the retarded boundary layer must be carried along by the outer flow against the increase of pressure. If, however, the pressure increases too quickly, the entraining effect is not sufficient, the boundary layer gathers together into mass turbulence, producing vortices with increased resistance and eventually leads to the separation of the stream.