Securing the Future of U.S. Air Transportation A System in Peril (2003) / Chapter Skim
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Appendix D: Propulsion Taxonomy: Comments on Propulsion Fundamentals
Appendix D: Propulsion Taxonomy: Comments on Propulsion Fundamentals
Pages 64-66
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From page 64... ...
Batteries have intentionally been omitted because considerable development seems to be necesTABLE D-1 Fundamental Thermodynamic Cycles (nonregenerativeja Heat Absorption Heat Rejection Comment Isothermal 2 Isothermal 3 Isothermal Isovolume Isovolume Isovolume 7 Isobaric 8 Isobaric Isobaric Isothermal Isovolume Isobaric Isothermal Isovolume Isobaric Isothermal Isovolume Isobaric Diesel cycle Brayton cycle NOTE: The tenth fundamental source of power is a fuel cell, which converts a fuel directly into electricity. aCompression and expansion processes are assumed to be isentropic.
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From page 65... ...
However, the continuous isothermal and isovolume cycles can be immediately ruled out as physically impossible because in the steady state the fluid is forced to move uphill against the total pressure gradient. This leaves 12 potential power plants (10 intermittent and 2 continuous: isobaric-isobaric and fuel cell)
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From page 66... ...
With the exceptions described above, the current state of the art for heat exchanger technology is based on surface heat removal, not volume heat removal. The thermal boundary layer is thin even in an axial flow compressor, meaning the heat exchanger is likely to be heavy and create additional pressure losses.
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