Aerodynamics of a Lifting System in Extreme Ground Effect by Kirill V. Rozhdestvensky

By Kirill V. Rozhdestvensky

This ebook describes a mathematical version of circulate prior a lifting approach acting regular and unsteady movement in shut proximity to the underlying reliable floor (ground).
The writer considers quite a few approximations in response to the overall approach to matched asymptotic expansions utilized to lifting flows. specific value is hooked up to the case of utmost flooring results describing very small relative flooring clearances. Practitioners taken with the layout of wing-in-ground impact automobiles will locate during this ebook the entire appropriate formulae and calculated facts for the prediction of aerodynamic features during this vital proscribing case. extra regularly, this e-book is appropriate for graduate scholars, researchers and engineers operating or lecturing within the sector of theoretical aerodynamics.

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Example text

The induced drag of the wing incorporating the suction force can be determined by investigating the flow far downstream in the 'frefftz plane. The induced drag coefficient is given by the formula CXt = 11 S 1 2 / 1/2 roo(z)awoo(z)dz, where r oo(z), a woo are the spanwise distributions of circulation and downwash in the 'frefftz plane, whereas S is the wing's reference area related to the square of the root chord. To the leading order, this expression can be represented in the form C Xi = - h; 1 12 /

82). 93) (x, z) E l2. 94) 42 2. 95) OZ PI - 2 [0

5) in the wake correspond to the Kelvin (Thomson) theorem and express the jump of the velo city potential across the vortex sheet at an arbitrary point of the latter, if this jump is known at any time at the trailing edge of the wing. The Kutta-Zhukovsky condition at the trailing edge can be viewed as incorporated into the above dynamic condition in the wake. 5), we derive 8rp+ 8rp- --=--, 8y 8y 2 (x, z) E W. y = h, For a wing with a straight trailing edge, Xte = o. 15) h . 24), namely, (x,z) E W.

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