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Test Results From a Pair of 1-kWe Dual-Opposed Free-Piston Stirling Power Convertors Integrated With a Pumped NaK LoopAs a step towards development of Stirling power conversion for potential use in Fission Surface Power (FSP) systems, a pair of commercially available 1-kW-class free-piston Stirling convertors were modified to operate with a NaK (sodium (Na) and potassium (K)) liquid metal pumped loop for thermal energy input. This was the first-ever attempt at powering a free-piston Stirling engine with a pumped liquid metal heat source and is a major FSP project milestone towards demonstrating technical feasibility. The convertors were successfully tested at the Marshall Space Flight Center (MSFC) from June 6 through July 14, 2009. The convertors were operated for a total test time of 66 hr and 16 min. The tests included (a) performance mapping the convertors over various hot- and cold-end temperatures, piston amplitudes, and NaK flow rates and (b) transient test conditions to simulate various startup (i.e., low-, medium-, and high-temperature startups) and fault scenarios (i.e., loss of heat source, loss of NaK pump, convertor stall, etc.). This report documents the results of this testing
Document ID
Document Type
Technical Memorandum (TM)
Geng, Steven M.
(NASA Glenn Research Center Cleveland, OH, United States)
Briggs, Maxwell H.
(Analex Corp. Brook Park, OH, United States)
Penswick, L. Barry
(Sest, Inc. Middleburgh Heights, OH, United States)
Pearson, J. Boise
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Godfroy, Thomas J.
(Maximum Technology Corp. Huntsville, AL, United States)
Date Acquired
August 25, 2013
Publication Date
March 1, 2011
Subject Category
Energy Production And Conversion
Report/Patent Number
Funding Number(s)
WBS: WBS 463169.
Distribution Limits
Public Use Permitted.
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