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Title: Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems

Abstract

Closed Brayton Cycles with centrifugal flow, single-shaft turbo-machines are being considered, with gas cooled nuclear reactors, to provide 10's to 100's of electrical power to support future space exploration missions and Lunar and Mars outposts. Such power system analysis is typically based on the cycle thermodynamics, for given operating pressures and temperatures and assumed polytropic efficiencies of the compressor and turbine of the Brayton energy conversion units. Thus the analysis results not suitable for modeling operation transients such as startup and changes in the electric load. To simulate these transients, accurate models of the turbine and compressor in the Brayton rotating unit, which calculate the changes in the compressor and turbine efficiencies with system operation are needed. This paper presents flow models that account for the design and dimensions of the compressor impeller and diffuser, and the turbine stator and rotor blades. These models calculate the various enthalpy losses and the polytropic efficiencies along with the pressure ratios of the turbine and compressor. The predictions of these models compare well with reported performance data of actual hardware. In addition, the results of a parametric analysis to map the operations of the compressor and turbine, as functions of the rotating shaftmore » speed and inlet Mach number of the gas working fluid, are presented and discussed. The analysis used a binary mixture of He-Xe with a molecular weight of 40 g/mole as the working fluid.« less

Authors:
; ;  [1];  [2]
  1. Institute for Space and Nuclear Power Studies, University of New Mexico, Albuquerque, NM, 87131 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
21054552
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 880; Journal Issue: 1; Conference: International forum-STAIF 2007: 11. conference on thermophysics applications in microgravity; 24. symposium on space nuclear power and propulsion; 5. conference on human/robotic technology and the vision for space exploration; 5. symposium on space colonization; 4. symposium on new frontiers and future concepts, Albuquerque, NM (United States), 11-15 Feb 2007; Other Information: DOI: 10.1063/1.2437488; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; BINARY MIXTURES; BRAYTON CYCLE; COMPARATIVE EVALUATIONS; DESIGN; EFFICIENCY; ENERGY CONVERSION; ENTHALPY; MACH NUMBER; PARAMETRIC ANALYSIS; PERFORMANCE; POWER SYSTEMS; REACTOR OPERATION; SPACE; SPACE PROPULSION REACTORS; TURBINES; WORKING FLUIDS; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Gallo, Bruno M., El-Genk, Mohamed S., Tournier, Jean-Michel, and Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131. Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems. United States: N. p., 2007. Web. doi:10.1063/1.2437488.
Gallo, Bruno M., El-Genk, Mohamed S., Tournier, Jean-Michel, & Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131. Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems. United States. doi:10.1063/1.2437488.
Gallo, Bruno M., El-Genk, Mohamed S., Tournier, Jean-Michel, and Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131. Tue . "Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems". United States. doi:10.1063/1.2437488.
@article{osti_21054552,
title = {Compressor and Turbine Models of Brayton Units for Space Nuclear Power Systems},
author = {Gallo, Bruno M. and El-Genk, Mohamed S. and Tournier, Jean-Michel and Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131},
abstractNote = {Closed Brayton Cycles with centrifugal flow, single-shaft turbo-machines are being considered, with gas cooled nuclear reactors, to provide 10's to 100's of electrical power to support future space exploration missions and Lunar and Mars outposts. Such power system analysis is typically based on the cycle thermodynamics, for given operating pressures and temperatures and assumed polytropic efficiencies of the compressor and turbine of the Brayton energy conversion units. Thus the analysis results not suitable for modeling operation transients such as startup and changes in the electric load. To simulate these transients, accurate models of the turbine and compressor in the Brayton rotating unit, which calculate the changes in the compressor and turbine efficiencies with system operation are needed. This paper presents flow models that account for the design and dimensions of the compressor impeller and diffuser, and the turbine stator and rotor blades. These models calculate the various enthalpy losses and the polytropic efficiencies along with the pressure ratios of the turbine and compressor. The predictions of these models compare well with reported performance data of actual hardware. In addition, the results of a parametric analysis to map the operations of the compressor and turbine, as functions of the rotating shaft speed and inlet Mach number of the gas working fluid, are presented and discussed. The analysis used a binary mixture of He-Xe with a molecular weight of 40 g/mole as the working fluid.},
doi = {10.1063/1.2437488},
journal = {AIP Conference Proceedings},
number = 1,
volume = 880,
place = {United States},
year = {Tue Jan 30 00:00:00 EST 2007},
month = {Tue Jan 30 00:00:00 EST 2007}
}