Experimental determination of the control drum-drive shaft loss coefficients using air. Test series FFL-8 Page: 13 of 147
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WANL-TME-715The flow discharging from the four 0.250-inch diameter drive shaft holes is
determined by subtracting the flow calculated using the actuator end profile
probes from the flow calculated using the dome end drive shaft profile probes.
Finally all of the flow passes through a common plenum leading to the total flow
measuring nozzle and then the air is exhausted to the atmosphere
It can be seen that all of the flow can be accounted for throughout
the test model by the use of the calibrated zones.
CALCULATIONS
Profile Probe Correction Factor
CORR = W actual/W probes = W/pAV1 0
whereCOR
WactuaR = correction factor for the profile probes (dimensionle
defined as the actual flow divided by the flow past t
probes
a = actual flow(lbm/sec). During calibration, the actual
flow was equal to the total flow and this is the flow
through the measuring nozzle.
A = area in which the probes are located (ft2)V1
= 18.25 &H/P
where
V1 = average velocity through the profile probe location
area (ft/sec)
C
RII Ass)
he(2)
6
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Jacob, W.L. Experimental determination of the control drum-drive shaft loss coefficients using air. Test series FFL-8, report, April 1, 1964; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc869800/m1/13/: accessed May 2, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.