GLTRS--Glenn
TITLE AND SUBTITLE:
Turbomachine Sealing and Secondary Flows
Part 1-Review of Sealing Performance, Customer, Engine Designer, and Research Issues

AUTHOR(S):
R.C. Hendricks, B.M. Steinetz, and M.J. Braun

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-13662-1

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-PART1

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 and B.M. Steinetz, NASA Glenn Research Center; and M.J. Braun, University of Akron, Akron, Ohio 44325. Responsible person, R.C. Hendricks, organization code 5000, 216-977-7507.

ABSTRACT:
Although forces outside our control shape our industry, turbomachine sealing research, design, and customer agendas established in 1978 by Ludwig, Campbell, and Smith in terms of specific fuel consumption and performance remain as objectives today. Advances have been made because failures of the space shuttle main engine turbomachinery ushered in a new understanding of sealing in high-power-density systems. Further, it has been shown that changes in sealing, especially for high-pressure rotors, dramatically change the performance of the entire engine or turbomachine. Maintaining seal leakages and secondary flows within engine design specifications remains the most efficient and cost-effective way to enhance performance and minimize maintenance costs. This three-part review summarizes experiences, ideas, successes, and failures by NASA and the U.S. aerospace industry in secondary flow management in advanced turbomachinery. Part 1 presents system sealing, part 2 system rotordynamics, and part 3 modeling, with some overlap of each part.

SUBJECT TERMS:
Turbomachine; Seals; Engine performance; Maintenance; Design; Secondary flow; Performance

NUMBER OF PAGES:
52

PDF AVAILABLE FROM URL:
2004/TM-2004-211991-PART1.pdf ( 7,446 KB )
This page contains an Adobe® Acrobat® Reader PDF file. The PDF documents have been created to show thumbnails of each page. If the thumbnails do not display properly, download the file to the hard drive and view through Acrobat® Reader. You can download Acrobat® Reader for free.

NASA NASA GLTRS--Glenn

A service of the NASA Glenn Research Center Logistics and Technical Information Division

Suggestions or questions about this site can be directed to:

NASA official: Technical Publications Manager, Sue.E.Butts@nasa.gov

Web curator: Caroline.A.Rist@grc.nasa.gov

Privacy Policy and Important Notices