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p9_noinlet_pitot.dat
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2000-04-07
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Group John Weijland, Jim Brossard, Dave Tow
we did 700 fpm flow because we could not accurately damp down the system. We
started with the pitot tube at the far wall where it was .2" away from the wall.
Our pascal measuring meter was at 6.9 pa with no pressure so 6.9 will have to be
subtracted from all values for delta P (could this instrument be sensitive to
barometric changes after calibration?)
Distance from far wall Pressure reading
.2 9.1
.6 9.4
1.0 9.2
1.4 9.2
1.8 9.2
2.2 9.2
2.6 9.1
3.0 8.9
3.4 8.9
3.8 8.6
4.2 8.3
4.6 7.9
5.0 7.7
5.4 7.8
After traversing the tunnel we took three readings: far side, middle and near
side which were respectively 8.5,8.4,9.1 which don't correspond with our
readings for smaller steps. I calculated the pressure we were looking for was
2.19 Pa so after subtracting 6.9 from all of them the values seem reasonable is
the meter was reading in Pa. I calculated the Reynolds number at 49539 and
entrance effect length at 17.7 ft.