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Record Details

Record 36 of 23402
Integrated Solar Upper Stage Technical Support
Author and Affiliation:
Jaworske, Donald A.(NASA Lewis Research Center, Cleveland, OH, United States)
Abstract: NASA Lewis Research Center is participating in the Integrated Solar Upper Stage (ISUS) program. This program is a ground-based demonstration of an upper stage concept that will be used to generate both solar propulsion and solar power. Solar energy collected by a primary concentrator is directed into the aperture of a secondary concentrator and further concentrated into the aperture of a heat receiver. The energy stored in the receiver-absorber-converter is used to heat hydrogen gas to provide propulsion during the orbital transfer portion of the mission. During the balance of the mission, electric power is generated by thermionic diodes. Several materials issues were addressed as part of the technical support portion of the ISUS program, including: 1) Evaluation of primary concentrator coupons; 2) Evaluation of secondary concentrator coupons; 3) Evaluation of receiver-absorber-converter coupons; 4) Evaluation of in-test witness coupons. Two different types of primary concentrator coupons were evaluated from two different contractors-replicated coupons made from graphite-epoxy composite and coupons made from microsheet glass. Specular reflectivity measurements identified the replicated graphite-epoxy composite coupons as the primary concentrator material of choice. Several different secondary concentrator materials were evaluated, including a variety of silver and rhodium reflectors. The specular reflectivity of these materials was evaluated under vacuum at temperatures up to 800 C. The optical properties of several coupons of rhenium on graphite were evaluated to predict the thermal performance of the receiver-absorber-converter. Finally, during the ground test demonstration, witness coupons placed in strategic locations throughout the thermal vacuum facility were evaluated for contaminants. All testing for the ISUS program was completed successfully in 1997. Investigations related to materials issues have proven helpful in understanding the operation of the test article, leading to a potential ISUS flight test in 2002.
Publication Date: Apr 01, 1998
Document ID:
20050182806
(Acquired Jul 05, 2005)
Subject Category: SPACECRAFT PROPULSION AND POWER
Document Type: Technical Report
Publication Information: Research and Technology 1997; (NASA/TM-1998-206312)
Financial Sponsor: NASA Lewis Research Center; Cleveland, OH, United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: SOLAR PROPULSION; SPACECRAFT PROPULSION; SPACECRAFT POWER SUPPLIES; SOLAR COLLECTORS; SPECULAR REFLECTION; REFLECTANCE; UPPER STAGE ROCKET ENGINES; GROUND TESTS; GRAPHITE-EPOXY COMPOSITES; GLASS; SYSTEMS INTEGRATION
Miscellaneous Notes: See Document ID 20050019500
Availability Source: Other Sources
Availability Notes: Abstract Only
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