188 Average sound velocity
Section 6: Meter operation Reference, Installation, and Operations Manual
August 2014 3-9000-743 Rev U
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 sound velocity
The average sound velocity is calculated as the average of the active chord sound velocity
measurements as shown in the equation below:
Equation 6-3 Average 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 sound velocity (m/s) (AvgSndVel)
=
chord average sound velocity (m/s)
(SndVelA ... SndVelD)
=
number of active chords
C
Avg
Σ
ActiveChords
C
chord
•
NumActiveChords
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=
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