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Advanced Stirling Radioisotope Generator (Asrg) Thermal Power Model in MATLAB
Nasa Technical Reports Server (Ntrs)
(Author)
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Xiao-Yen J. Wang
(Author)
·
Bibliogov
· Paperback
Advanced Stirling Radioisotope Generator (Asrg) Thermal Power Model in MATLAB - Wang, Xiao-Yen J. ; Nasa Technical Reports Server (Ntrs)
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Synopsis "Advanced Stirling Radioisotope Generator (Asrg) Thermal Power Model in MATLAB"
This paper presents a one-dimensional steady-state mathematical thermal power model of the ASRG. It aims to provide a guideline of understanding how the ASRG works and what can change its performance. The thermal dynamics and energy balance of the generator is explained using the thermal circuit of the ASRG. The Stirling convertor performance map is used to represent the convertor. How the convertor performance map is coupled in the thermal circuit is explained. The ASRG performance characteristics under i) different sink temperatures and ii) over the years of mission (YOM) are predicted using the one-dimensional model. Two Stirling converter control strategies, i) fixing the hot-end of temperature of the convertor by adjusting piston amplitude and ii) fixing the piston amplitude, were tested in the model. Numerical results show that the first control strategy can result in a higher system efficiency than the second control strategy when the ambient gets warmer or the general-purpose heat source (GPHS) fuel load decays over the YOM. The ASRG performance data presented in this paper doesn't pertain to the ASRG flight unit. Some data of the ASRG engineering unit (EU) and flight unit that are available in public domain are used in this paper for the purpose of numerical studies.
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