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Field Reliability of Oil/Air Clearance Seal for Air Turbine Starters
Technical Paper
1999-01-1377
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A noncontacting clearance seal consists of a series of centrifugal air pumps and oil/air separators for air turbine starters on the BR710 and the CFM56-5 engines. Conventional contacting seals for rotating shafts are limited in life due to the formation of oxidized oil coke buildup on the sealing surfaces. The clearance seal directly addresses the problem of viscous heat generation in carbon face and lip seals by eliminating contact. Standard contacting seals typically have local temperature increases of 50 to 75 °F higher than the gearbox sump oil. Heat generation by the clearance seal is minimized, resulting in a significant increase in reliability compared to a standard contacting seal. The reliability increase is estimated for various flight-hour-to-start-cycle ratios in air turbine starter gearboxes.
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Authors
Citation
Giesler, W., Foley, R., Mathis, D., and Schroeder, G., "Field Reliability of Oil/Air Clearance Seal for Air Turbine Starters," SAE Technical Paper 1999-01-1377, 1999, https://doi.org/10.4271/1999-01-1377.Data Sets - Support Documents
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References
- Hager, J. Geck, K. Giesler, W. Farnsworth, G. “Oil Seal for a High Speed Rotating Shaft.” Jul. 23 1996
- Hager, J. Geck, K. Giesler, W. Mathis, D. “Oil Seal for a High Speed Rotating Shaft.” Jun. 10 1997
- Trutnovsky, K. “Dichtungen. Werkstattbücher.” Springer Verlag 1945 92
- Giesler, W. Mathis, D. Hager, J. “High Reliability Oil-Air High Speed Gear Box Clearance Seal.” AIAA 98-3287 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference Jul. 12-15 1998
- Dovich, R. “Reliability Statistics.” ASQC Quality Press 1990 25
- Miller, I. Freund, J. “Probability and Statistics for Engineers.” Prentice Hall 1985 441