Follow this link to go to the text only version of nasa.gov
NASA - National Aeronautics and Space Administration
+ Contact NASA
Go
Structures and Materials Division Research and Technology Directorate NASA Glenn Research Center

Tribology and mechanical Components Branch
Tribology and mechanical Components Home
Research Areas
Facilities
Personnel
Publications
Computer Codes
Partner with Us
Contact Information
Aerospace Seals - Hypersonic Propulsion Seals
Research Objectives
Develop hot (2000 – 2500+ °F), flexible, dynamic structural seals for ramjet and scramjet propulsion systems.
Technical Challenges
  • Withstand temperatures of 2000-2500 °F and high heat fluxes with minimal cooling
  • Limit leakage of hot gases and unburned propellant into backside cavities
  • Survive in a chemically hostile environment (e.g. oxidation, hydrogen embrittlement)
  • Seal against distorted sidewalls and remain resilient for multiple heating cycles
  • Survive hot scrubbing with acceptable change in flow rates

Current Research
Several of the candidate seal designs for future hypersonic propulsion systems are not inherently resilient and require a spring preload device behind them to keep them in contact with the sealing surface. The current focus of this research area is to develop a spring preload device that maintains its resiliency at temperatures up to 2000°F and evaluate its performance at high temperatures.

Ceramic Wafer Seal
 
Above: Panel edge seals designed to seal the gaps between the movable ramps and adjacent engine sidewalls in a hypersonic propulsion system.
 
 
Turbine Seal Timeline
Resilient Flexible Pressure-Activated Seal
Bruce M. Steinetz and Patrick J. Dunlap, Jr.
US Patent No. 7,497,443 Issued: March 3, 2009

High Temperature Seal for Large Structural Movements
Bruce M. Steinetz and Patrick J. Dunlap, Jr.
Patent No. 6,702,300 Link to non-NASA website B1 Issued: March 9, 2004

Resilient Braided Rope Seal
Bruce M. Steinetz and Lawrence A. Kren
Patent No. 6,039,325 Link to non-NASA website Issued: March 21, 2000

1996 Invention of the Year Award Winner
High Temperature, Flexible Fiber-Preform Seal

Bruce M. Steinetz and Paul J. Sirocky
Patent No. 5,082,293 Link to non-NASA website Issued: January 21, 1992
Read more about the Invention of the Year award...

High Temperature, Bellows Hybrid Seal

Bruce M. Steinetz and Paul J. Sirocky
Patent No. 5,332,239 Link to non-NASA website Issued: July 26, 1994

High Temperature, Flexible Pressure-Actuated Brush Seal

Bruce M. Steinetz and Paul J. Sirocky
Patent No. 5,076,590 Link to non-NASA website Issued: December 31, 1991

High Temperature, Flexible Thermal Barrier Seal

Paul J. Sirocky and Bruce M. Steinetz
Patent No. 5,014,917 Link to non-NASA website Issued: May 14, 1991

High Temperature, Flexible Seal

Bruce M. Steinetz and Paul J. Sirocky
Patent No. 4,917,302 Link to non-NASA website Issued: April 17, 1990

+ Return to the branch research page...
Point of Contact
Pat Dunlap
Publications
View a list of published NASA reports
+ View related publications
Related Facilities
Learn more about our Aerospace Seals Facilities
+ View Facility Listing
Events
NOTE CHANGE:
NASA Seals and Secondary Flows Symposium

November 19, 2013 - Postponed to Nov. 2014 due to Government Shutdown in October. Watch for new date.

Open to OEM'S and vendors
U.S. citizens and permanent legal residents (green card holders) only

Location
Ohio Aerospace Institute Link to non-NASA website

Directions/Maps
GRC (Google Maps) Link to non-NASA website
Map to GRC (PDF)
Local food/lodging (PDF)

Download Workshop Papers
Get Adobe Acrobat Reader


MORE INFO IN NASA SITE NETWORK

+ Freedom of Information Act
+ NASA Web Privacy Policy and Important Notices
NASA - National Aeronautics and Space Administration
NASA Official: Ajay K. Misra
+ Web Curator
+ Contact NASA
Last Updated: May 19, 2009