NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Multiple Exhaust Nozzle Effects on J-2X Gas Generator Outlet ImpedanceThe current test setup of the J-2X gas generator system uses a multiple nozzle configuration to exhaust hot gases to drive the propellant supply turbines. Combustion stability assessment of this gas generator design requires knowledge of the impedance effects the multiple nozzle configuration creates on the combustion chamber acoustic modes. Parallel work between NASA and Sierra Engineering is presented, showing two methods used to calculate the effective end impedance resulting from multiple nozzle configurations. The NASA method is a simple estimate of the effective impedance using the long wavelength approximation. Sierra Engineering has developed a more robust numerical integration method implemented in ROCCID to accommodate for multiple nozzles. Analysis using both methods are compared to J-2X gas generator test data collected over the past year.
Document ID
20100022025
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Kenny, R. Jeremy
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Muss, Jeffrey
(Sierra Engineering, Inc. Sacramento, CA, United States)
Hulka, James R.
(Jacobs Technologies Engineering Science Contract Group Huntsville, AL, United States)
Casiano, Matthew
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
May 3, 2010
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
M10-0183
Meeting Information
Meeting: 57th JANNAF Joint Propulsion Meeting
Location: Colorado Springs, CO
Country: United States
Start Date: May 3, 2010
End Date: May 7, 2010
Sponsors: NASA Headquarters, Department of the Army, Department of the Air Force, Department of the Navy
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available