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Experimental and Analytical Performance of a Dual Brayton Power Conversion SystemThe interactions between two closed Brayton cycle (CBC) power conversion units (PCU) which share a common gas inventory and heat source have been studied experimentally using the Dual Brayton Power Conversion System (DBPCS) and analytically using the Closed- Cycle System Simulation (CCSS) computer code. Selected operating modes include steady-state operation at equal and unequal shaft speeds and various start-up scenarios. Equal shaft speed steady-state tests were conducted for heater exit temperatures of 840 to 950 K and speeds of 50 to 90 krpm, providing a system performance map. Unequal shaft speed steady-state testing over the same operating conditions shows that the power produced by each Brayton is sensitive to the operating conditions of the other due to redistribution of gas inventory. Startup scenarios show that starting the engines one at a time can dramatically reduce the required motoring energy. Although the DBPCS is not considered a flight-like system, these insights, as well as the operational experience gained from operating and modeling this system provide valuable information for the future development of Brayton systems.
Document ID
Document Type
Technical Memorandum (TM)
Lavelle, Thomas A.
(NASA Glenn Research Center Cleveland, OH, United States)
Hervol, David S.
(Analex Corp. Brook Park, OH, United States)
Briggs, Maxwell
(Analex Corp. Brook Park, OH, United States)
Owen, A. Karl
(Army Research Lab. Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
February 1, 2009
Subject Category
Energy Production And Conversion
Report/Patent Number
AIAA Paper-2008-5735
Meeting Information
6th International Energy Conversion Engineering Conference(Ohio)
Funding Number(s)
WBS: WBS 463169.
Distribution Limits
Public Use Permitted.
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