By Kirill V. Rozhdestvensky
This publication describes a mathematical version of stream previous a lifting process acting regular and unsteady movement in shut proximity to the underlying stable floor (ground).
The writer considers a variety of approximations in accordance with the overall approach to matched asymptotic expansions utilized to lifting flows. specific significance is hooked up to the case of utmost flooring results describing very small relative floor clearances. Practitioners thinking about the layout of wing-in-ground impression automobiles will locate during this e-book the entire correct formulae and calculated facts for the prediction of aerodynamic features during this very important restricting case. extra normally, this e-book is acceptable for graduate scholars, researchers and engineers operating or lecturing within the zone of theoretical aerodynamics.
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Extra info for Aerodynamics of a Lifting System in Extreme Ground Effect
For a steady flow with asymptotic error O(h), the downwash in the wake is not dependent on x. 19) The flow above the lifting system and its wake (upper flow) is identical to what was considered previously. The upper flow potential CPu is of the order of O(e:) and, to the lowest order, is described by an expansion 50 3. 33). Local fiows are linearized consistent with the overalllinearization scheme. Stretching of local coordinates is performed by the ground clearance h rather than the local instantaneous distance of the edge from the ground as in the nonlinear case.
2 Two-Dimensional Steady Flow Past a Slightly Curved Foil 51 Within the linearized formulation, the extreme ground effect case has a still simpler mathematical description than in the nonlinear theory. 31) Transition points, separating the leading (side) and trailing edges, are coincident with the wing tips. 2 Two-Dimensional Steady Flow Past a Slightly Curved Foil Consider a slightly curved infinitely thin foil, moving steadily near asolid flat ground plane with an angle of pitch (). 32) with the following boundary conditions at the end points of the segment o~ x ~ 1: • At the leading edge (x = 1), In the third stage, match the upper fiow potential
In the third stage, match the upper fiow potential