Civil Engineering Reference
In-Depth Information
2
L
d
A dy
Q
d y
ga
(3.10.2)
×
+ ++ = + =
yh
0,
y
0
f
2
g
dt
a dt
a
dt
LA
2
2
L
d
A dy
Q
d y
d y
ga
×
+
+ +
y h
=
0,
+
Wy
2
=
0,
+
y
=
0
f
g
dt
a dt
a
dt
2
dt
2
LA
2
d y
ga
+
y
=
0
2
dt
LA
d y
2
ga
,
(If : f & Q, Equal to zero)
2
2
+
Wy
=
0,
W
=
2
dt
LA
t
yy
=
max
sin 2
π
(3.10.3),
2
π
LA
T
==
2
π
W
ga
(3.10.4)
u
LA
y
= =
u
,
y
=−
y
0.6
h
max
max
f
W
ga
(3.10.5),
δ
.
Qh
Fluid power =
(3.10.6),
δ −∆
(
H
hVA
). .
Fluid power =
(3.10.7),
L
V
2
head friction =
= ⇒
f
(3.10.8),
Dg
2
h
..(
δ
V A H
−
KV
)
Fluid power =
(3.10.9)
Generally, the maximum transient head envelope calculated by rigid water column
theory (RWCT) is a straight line, as shown in the following figure. The rigid model
has limited applications in hydraulic transient analysis because the resulting equations
do not accurately model pressure waves caused by rapid flow control operations. The
rigid model applies to slower surge or mass oscillation transients, as defined in “Wave
Propagation and Characteristic Time”.
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