16100lectre33_cj

16100lectre33_cj - = 2 ) ( 16 1 1 b h b b w i original...

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Ground Effect Using Single Vortex Model What is the boundary condition at ground ( 0 = z ) and does a single horseshoe vortex satisfy it?? B.C.: “solid wall” Consider from far downstream: So, to satisfy bc: Image vortices Γ Γ Γ b h ! 0 0 0 = = = z w n u at v v h b z Γ Γ y b b Γ Γ Γ Γ h h
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Ground Effect Using Single Vortex Model 16.100 2002 2 Result: downwash is decreased due to upwash “caused” by ground plane (which is modified by image vortex). For our simple model: + Γ + Γ
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Unformatted text preview: = 2 ) ( 16 1 1 b h b b w i original ground isolated effect wing effect + = + = i i i w b h b h w b h b h b w 2 2 2 2 ) ( 16 1 ) ( 16 ) ( 16 1 ) ( 16 + = i i i D b h b h bV L V w L D 2 2 ) ( 16 1 ) ( 16 2 2 ) ( 16 1 ) ( 16 b h b h D D i i + = 2 2 ) ( 16 1 ) ( 16 b h b h C C i i D D + = Image vortex (opposite strength) i i ) ( ) ( are true for fixed ) (i.e. L...
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This note was uploaded on 11/06/2011 for the course AERO 100 taught by Professor Willcox during the Fall '03 term at MIT.

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16100lectre33_cj - = 2 ) ( 16 1 1 b h b b w i original...

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