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Analytical Study of the relationship Between an Absorber Cavity and Solar Fresnel ConcentratorThis paper presents an analytical study of the relationship between an engine absorber cavity and a solar concentrator in a solar thermal propulsion system. The engine is a thermal storage engine, and the concentrator consists of a primary thin-film fresnel concentrator and a secondary Compound Parabolic Concentrator. Two thermal models of the engine are developed, a blackbody cavity model and a 2D numerical model. Results of the two models are compared, with attention to the limitations of the blackbody model 'Me fresnel concentrator model is based on a Circle of Least Confusion approach. The results of the thermal and optical models are combined to create a combined model with absorber temperature predictions. This combined model approach is used to predict an optimum engine aperture size.
Document ID
19990078510
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Pearson, J. Boise
(NASA Marshall Space Flight Center Huntsville, AL United States)
Watson, Michael D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Subject Category
Energy Production And Conversion
Meeting Information
Meeting: Solar Space Applications
Location: Albuquerque, NM
Country: United States
Start Date: June 13, 1998
End Date: June 19, 1998
Sponsors: American Society for Mechanical Engineers
Distribution Limits
Public
Copyright
Other

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