Read e-book online Aerodynamics: Fundamentals of Theory, Aerodynamics of an PDF

By N.F. Krasnov

ISBN-10: 0828531196

ISBN-13: 9780828531191

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Extra info for Aerodynamics: Fundamentals of Theory, Aerodynamics of an Airfoil and Wing; Methods of Aerodynamic Calculation

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Cos B - lvly sin ex. 4') For example, for the motion of the aircraft shown in Fig. 1, Eq. 4) yields, with the relevant signs: -X a = -X cos ex. cos B- Y sin ex. cos B+ B Z sin The force and moment components* are converted in a similar way from a flight path to a body axis coordinate system. 1, we obtain the following conversion formulas for tho longitudinal force and the rolling moment: X = Xa cos ex. cos JlJ x = J1xa cos ex. cos B B+ Y a sin ex. - Jl y " sin ex. - Za cos ex. 5) JlJ z " cos ex.

The studying of the motion in a boundary layer is associated with the simultaneous investigation of the flow of a fluid in a turbulent core and a viscous sublayer. The change in the velocity over the cross section of the boundary layer is characterized by its gradually growing with the distance from the wall and asymptotically approaching the value of the velocity in the external flow. For practical purposes, however, it is convenient to take the part of the boundary layer in which this change occurs sufficiently rapidly, and the velocity at the boundary of this layer differs only slightly from its value in the external flow.

To the appearance of the relative motion of the fluid particles in the layers. In accordance with a hypothesis first advanced by I. Newton, the shear stress for given conditions is proportional to the velocity of this motion per unit distance between layers with particles moving 'relative to one another. If the distance between the layers is An. e. when the layers are in contact, equals the ,derivative aulan known as the normal velocity gradient. On the basis ,of this hypothesis. 1. 7) where [t is a proportionality factor depending on the properties of a fluid.

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Aerodynamics: Fundamentals of Theory, Aerodynamics of an Airfoil and Wing; Methods of Aerodynamic Calculation by N.F. Krasnov


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