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188 Average weighted sound velocity
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
For all other port angles,
where
Note that a positive chord gas velocity indicates flow in the forward direction whereas a
negative chord gas velocity indicates flow in the reverse direction.
6.1.6 Average weighted sound velocity
The average weighted sound velocity is calculated as the average of the active chord sound
velocity measurements as shown in the equation below:
Equation 6-3 Average weighted sound velocity
where
=
chord average gas velocity (m/s)
(FlowVelA ... FlowVelD)
=
chord average sound velocity (m/s)
(SndVelA ... SndVelD)
=
chord “L” dimension (m) (LA ... LD)
=
chord “X” dimension (m) (XA ... XD)
=
chord average transit time in the upstream direction (s)
(MeanTmA1 ... MeanTmD1)
=
chord average transit time in the downstream
direction (s) (MeanTmA2 ... MeanTmD2)
=
average weighted sound velocity (m/s) (AvgSndVel)
=
chord weight (dimensionless) (WtA ... WtD)
=
chord average sound velocity (m/s)
(SndVelA ... SndVelD)
=
number of active chords
PortAngleFactor 1=
V
chord
C
chord
L
chord
X
chord
t
1
t
2
C
Avg
Wt
chord
C
chord
⋅
ActiveChords
NumActiveChords
-------------------------------------------------------------------
=
C
Avg
Wt
chord
C
chord
NumActiveChords