Annular gas seal clearances were simulated with closely spaced parallel plates
using a Flat?Plate tester. The device is designed to measure the pressure gradient along
the test specimen. The main function of the Flat?Plate tester is to provide friction factor
data and measure dynamic pressure oscillations. A detailed description of the test
facility is described, and a theory for determining the friction factor is reviewed. Three
clearances were investigated: 0.635, 0.381, and 0.254 mm. Tests were conducted at
three different inlet pressures (84, 70, and 55 bars), producing Reynolds numbers range
from 50,000 to 700,000. Three surface configurations were tested including smooth?on-smooth,
smooth?on?hole, and hole?on?hole. The Hole?pattern plates are identical with
the exception of the hole depth. The results indicate that, for the smooth?on?smooth
and smooth?on?hole configurations, the friction factor remains constant or increases
slightly with increasing Reynolds numbers. Moreover, the friction factor increases as
the clearance between the plates increases. However, the results from the hole?on-hole configurations are quite different. A "friction?factor jump" phenomenon was
observed, and the Helmholtz frequency was detected on the frequency spectra.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2009-08-7190 |
| Date | 2009 August 1900 |
| Creators | Kheireddin, Bassem A. |
| Contributors | Childs, Dara W. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | application/pdf |
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