43. When the barrier AA´ is held oblique to the current, the stream
line xB is curved to the branch point B on AA´ (fig. 7), and so must
be excluded from the boundary of u; the conformal representation is
made now with
d[Omega] [root](b - a·b - a´)
-------- = - ---------------------------- (1)
du (u - b) [root](u - a·u - a´)
dw m 1 m´ 1 m + m´ u - b
-- = - ---- ----- - ---- -----, = - ------ · -------------,
du [pi] u - j [pi] u - j [pi] u - j·u - j´
mj´ + m´j
b = ---------, (2)
m + m´
taking u = [oo] at the source where [phi] = [oo], u = b at the branch
point B, u = j, j´ at the end of the two diverging streams where [phi]
= -[oo]; while [psi] = 0 along the stream line which divides at B and
passes through A, A´; and [psi] = m, -m´ along the outside boundaries,
so that m/Q, m´/Q is the final breadth of the jets, and (m + m´)/Q is
the initial breadth, c1 of the impinging stream. Then
/b - a´ /u - a /b - a /u - a´
ch ½[Omega] = / ------ / -----, sh ½[Omega] = / ------ / ------, (3)
\/ a - a´ \/ u - b \/ a - a´ \/ u - b
2b - a - a´ N
ch [Omega] = ----------- - -----,
a - a´ u - b
/ [root](2·a - u·u - a´)
sh [Omega] = / N----------------------,
\/ u - b
a - b·b - a´
N = 2------------. (4)
a - a´
Along a jet surface, q = Q, and
ch[Omega] = cos [theta] = cos [alpha] - ½sin² [alpha](a - a´)/(u - b), (5)
if [theta] = [alpha] at the source x of the jet xB, where u = [oo];
and supposing [theta] = [beta], [beta]´ at the end of the streams
where u = j, j´,
u - b ½ sin² [alpha] u - j cos[theta] - cos[beta]
----- = -------------------------, ------ = ½ sin² [alpha]-----------------------------------------------------,
a - a´ cos [alpha] - cos [theta] a - a´ (cos [alpha] - cos [beta])(cos [alpha] - cos [theta])
u - j´ cos [theta] - cos [beta]´
----- = ½ sin² [alpha]------------------------------------------------------; (6)
a - a´ (cos [alpha] - cos [beta]´)(cos [alpha] - cos [theta])
and [psi] being constant along a stream line
d[phi] dw ds d[phi] dw du
------ = --, Q -------- = -------- = -- --------,
du du d[theta] d[theta] du d[theta]
[pi]Q ds [pi] ds (cos [alpha] - cos [beta])(cos [alpha] - cos [beta]´)sin[theta]
------ -------- = ---- -------- = ---------------------------------------------------------------------------------,
m + m´ d[theta] c d[theta] (cos [alpha] - cos [theta])(cos [theta] - cos [beta])(cos [theta] - cos [alpha]´)
Public-domain text, read in full here on John Shaqi.
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