Experimental determination of the control drum-drive shaft loss coefficients using air. Test series FFL-8 Page: 29 of 147
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across these holes is so small, large variations in calculated loss coefficient
can be obtained with even the smallest disturbance in the flow at the 2.1 and
2.2 pressure tap locations. At low flow the pressure drops measured are lower
than 1/4 of a pound per square inch, and the maximum possible error is estimated
to be 49%.
Composite Loss Coefficient for Nozzle End Bearing Shaft & Control Drum (1.1-3.l)
A lumped loss coefficient from the model inlet station 1.1 to just
inside the control drum outer (8) holes was obtained as shown on Figure 25.
This coefficient is a combination of the losses through the nozzle end bearing
shaft outer (8) holes, the interaction losses upon discharge from these holes
with the ring clearance flow, and the contraction losses of the flow upon
entering the outer (8) control drum flow holes. The area upon which the loss
coefficient and Reynolds number is based is that of the control drum outer (8)
holes (0.180-inch diameter). It appears that there is no decisive trend for the
variance in ring clearance and nozzle end plenum depth. Recall that the percent
of the total flow through the control drum remained constant for a given Reynolds
number regardless of the NEBS clearance conditions. A representative loss coeffi-
cient for Reynolds numbers between 3x104 and 1.3x105 is 1.62 despite any of the
above mentioned NEBS changes.
Loss Coefficient for the Nozzle End Ring (2.3-3.1 and 2.4-2.2)
The nozzle end bearing shaft ring clearance loss coefficient and
Reynolds number are based on the ring clearance at the 1.5 inch diameter. Since
there are four nozzle end bearing shafts that provide different ring clearances,
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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/m1/29/: accessed May 2, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.