GLTRS--Glenn
TITLE AND SUBTITLE:
Turbomachine Sealing and Secondary Flows
Part 3-Review of Power-Stream Support, Unsteady Flow Systems, Seal and Disk Cavity Flows, Engine Externals, and Life and Reliability Issues

AUTHOR(S):
R.C. Hendricks, B.M. Steinetz, E.V. Zaretsky, M.M. Athavale, and A.J. Przekwas

REPORT DATE:
July 2004

FUNDING NUMBERS:
Cost Center 2250000013

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-13662-3

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2004-211991-PART3

SUPPLEMENTARY NOTES:
Portions of this material were presented at the Second International Symposium on Stability Control of Rotating Machinery sponsored by Bently Pressurized Bearing Company, Gdansk, Poland, August 4-8, 2003. R.C. Hendricks, B.M. Steinetz, and E.V. Zaretsky, NASA Glenn Research Center; and M.M. Athavale and A.J. Przekwas, CFD Research Corporation, Huntsville, Alabama 35805. Responsible person, R.C. Hendricks, organization code 5000, 216-977-7507.

ABSTRACT:
The issues and components supporting the engine power stream are reviewed. It is essential that companies pay close attention to engine sealing issues, particularly on the high-pressure spool or high-pressure pumps. Small changes in these systems are reflected throughout the entire engine. Although cavity, platform, and tip sealing are complex and have a significant effect on component and engine performance, computational tools (e.g., NASA-developed INDSEAL, SCISEAL, and ADPAC) are available to help guide the designer and the experimenter. Gas turbine engine and rocket engine externals must all function efficiently with a high degree of reliability in order for the engine to run but often receive little attention until they malfunction. Within the open literature statistically significant data for critical engine components are virtually nonexistent; the classic approach is deterministic. Studies show that variations with loading can have a significant effect on component performance and life. Without validation data they are just studies. These variations and deficits in statistical databases require immediate attention.

SUBJECT TERMS:
Turbomachine; Seals; Secondary flow; Engine externals; Component life

NUMBER OF PAGES:
53

PDF AVAILABLE FROM URL:
2004/TM-2004-211991-PART3.pdf ( 5,128 KB )
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