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Status on the Verification of Combustion Stability for the J-2X Engine Thrust Chamber AssemblyDevelopment is underway of the J -2X engine, a liquid oxygen/liquid hydrogen rocket engine for use on the Space Launch System. The Engine E10001 began hot fire testing in June 2011 and testing will continue with subsequent engines. The J -2X engine main combustion chamber contains both acoustic cavities and baffles. These stability aids are intended to dampen the acoustics in the main combustion chamber. Verification of the engine thrust chamber stability is determined primarily by examining experimental data using a dynamic stability rating technique; however, additional requirements were included to guard against any spontaneous instability or rough combustion. Startup and shutdown chug oscillations are also characterized for this engine. This paper details the stability requirements and verification including low and high frequency dynamics, a discussion on sensor selection and sensor port dynamics, and the process developed to assess combustion stability. A status on the stability results is also provided and discussed.
Document ID
20130014078
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Casiano, Matthew
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hinerman, Tim
(Pratt and Whitney Rocketdyne Canoga Park, CA, United States)
Kenny, R. Jeremy
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hulka, Jim
(Jacobs Technology, Inc. Huntsville, AL, United States)
Barnett, Greg
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Dodd, Fred
(Pratt and Whitney Rocketdyne Canoga Park, CA, United States)
Martin, Tom
(Pratt and Whitney Rocketdyne Canoga Park, CA, United States)
Date Acquired
August 27, 2013
Publication Date
April 29, 2013
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
M12-2211
Meeting Information
Meeting: 60th JANNAF Propulsion Meeting/7th Liquid Propulsion(LPS)
Location: Colorado Springs, CO
Country: United States
Start Date: April 29, 2013
End Date: May 3, 2013
Distribution Limits
Public
Copyright
Public Use Permitted.
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