Pulsar UltraTWIN, Instruction Manual

Page: 88 / 214

ULTRATWIN (UL) INSTRUCTION MANUAL
88
U-Throated Flume Calculations
Absolute
If the flow calculation is to be absolute P702 = 1 the flow will be calculated
using the formula: q = (2/3) 1.5 g
n
0.5 C
u
C
v
C
d
bh 1.5
Where:
q = flowrate
g
n
= gravitational acceleration, (nominal value = 980.66 cm/s
2
)
h = head
C
u
= shape coefficient calculated by UltraTWIN (P724)
C
v
= velocity coefficient calculated by UltraTWIN (P721)
C
d
= discharge coefficient calculated by UltraTWIN (P722)
b = throat width P711
Ratiometric
If the flow calculation is to be ratiometric P702 = 2 the flow will be
calculated using the formula:
q= q
cal
(C
v
/C
vcal
)(C
d
/C
dcal
)(C
u
/C
ucal
)(h/h
cal
)
1.5
Where:
q = flowrate
q
cal
= flowrate at maximum head P705
Cv = velocity coefficient calculated by UltraTWIN (P721)
Cv
cal
= velocity coefficient at maximum head
Cd = discharge coefficient calculated by UltraTWIN (P722)
Cd
cal
= discharge coefficient at maximum head
Cu = shape coefficient P724
Cu
cal
= shape coefficient at maximum head
h = head h
cal
= maximum head P704