Page 108 - Aeronautical Engineer Data Book
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84 Aeronautical Engineer’s Data Book
y ∂v ∂v
v+ δx+ δy
∂x ∂y
∂u ∂u
∆m u+ δx+ δy
∂x ∂y
v Q(x+δx,y+δy)
u
P(x,y)
0 x
Fig. 5.4 The vorticity equation basis in 2-D
y
ψ ψ + dψ
dQ
B
u
dy
A
v
dx
0 x
Fig. 5.5 Flow rate (q) and stream function ( ) relationship
δs β
q β
q cos β
q sin β
Fig. 5.6 Velocity potential basis
