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System mass variation and entropy generation in 100k we closed-brayton-cycle space power systems
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Barrett, Michael J. Reid, Bryan M. |
| Copyright Year | 2004 |
| Description | State-of-the-art closed-Brayton-cycle (CBC) space power systems were modeled to study performance trends in a trade space characteristic of interplanetary orbiters. For working-fluid molar masses of 48.6, 39.9, and 11.9 kg/kmol, peak system pressures of 1.38 and 3.0 MPa and compressor pressure ratios ranging from 1.6 to 2.4, total system masses were estimated. System mass increased as peak operating pressure increased for all compressor pressure ratios and molar mass values examined. Minimum mass point comparison between 72 percent He at 1.38 MPa peak and 94 percent He at 3.0 MPa peak showed an increase in system mass of 14 percent. Converter flow loop entropy generation rates were calculated for 1.38 and 3.0 MPa peak pressure cases. Physical system behavior was approximated using a pedigreed NASA Glenn modeling code, Closed Cycle Engine Program (CCEP), which included realistic performance prediction for heat exchangers, radiators and turbomachinery. |
| File Size | 983291 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040028039 |
| Archival Resource Key | ark:/13960/t84j5fw8j |
| Language | English |
| Publisher Date | 2004-01-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Turbomachinery Spacecraft Power Supplies Compressors Entropy Brayton Cycle Feedback Control Heat Exchangers Weight Mass Mass Flow Rate Systems Engineering Working Fluids Pressure Ratio Mathematical Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
