Design and Off-design Performance of 100 Kwe-class Brayton Power Conversion Systems
- Johnson, Paul K.
- January 28, 2005.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Mason, Lee S.
- hdl.handle.net , Connect to this object online.
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
- The NASA Glenn Research Center in-house computer model Closed Cycle Engine Program (CCEP) was used to explore the design trade space and off-design performance characteristics of 100 kWe-class recuperated Closed Brayton Cycle (CBC) power conversion systems. Input variables for a potential design point included the number of operating units (1, 2, 4), cycle peak pressure (0.5, 1, 2 MPa), and turbo-alternator shaft speed (30, 45, 60 kRPM). The design point analysis assumed a fixed turbine inlet temperature (1150 K), compressor inlet temperature (400 K), working-fluid molecular weight (40 g/mol), compressor pressure ratio (2.0), recuperator effectiveness (0.95), and a Sodium-Potassium (NaK) pumped-loop radiator. The design point options were compared on the basis of thermal input power, radiator area, and mass. For a nominal design point with defined Brayton components and radiator area, off-design cases were examined by reducing turbine inlet temperature (as low as 900 K), reducing shaft speed (as low as 50% of nominal), and circulating a percentage (up to 20%) of the compressor exit flow back to the gas cooler. The off-design examination sought approaches to reduce thermal input power without freezing the radiator.
- Other Subject(s):
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 20050185419.
Space Technology and Applications International Forum (STAIF-2005); 13-15 Feb. 2005; Albuquerque, NM; United States.
University of New Mexico's Institute for Space and Nuclear Power Studies (ISNPS) Conference Proceedings; 13-15 Feb. 2005; Albuquerque, NM; United States.
- No Copyright.
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