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TECHNICAL PAPERS: Power

Thermodynamic Property Models for Moist Air and Combustion Gases

[+] Author and Article Information
D. Bücker, R. Span, W. Wagner

Lehrstuhl für Thermodynamik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

J. Eng. Gas Turbines Power 125(1), 374-384 (Dec 27, 2002) (11 pages) doi:10.1115/1.1520154 History: Received December 01, 2000; Revised May 01, 2002; Online December 27, 2002
Copyright © 2003 by ASME
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References

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Figures

Grahic Jump Location
Percentage deviations of different tabulated values cpo for the ideal gas isobaric heat capacity from values cp,refo calculated with Eq. (4) for the non-noble gas components
Grahic Jump Location
Expected uncertainties of ideal gas isobaric heat capacities of a typical combustion gas calculated with the new scientific reference, Eq. (4), for the stoichiometric case (λ=1) and for an air equivalence ratio of λ≈3; effects of dissociation are not considered
Grahic Jump Location
Percentage deviations of values for the ideal gas isobaric heat capacity of a typical combustion gas (λ≈3) calculated by commonly used technical models from values calculated with the new scientific reference, Eq. (4)
Grahic Jump Location
Percentage deviations of values for the ideal gas isobaric heat capacity calculated with the technical equations, Eq. (6), from values calculated with the scientific reference, Eq. (4)
Grahic Jump Location
Percentage deviations of values for the ideal gas heat capacity calculated with the new technical equations, Eq. (15), and some commonly used technical models from values calculated with the new scientific reference, Eq. (4)
Grahic Jump Location
Increase of the effective isobaric heat capacity due to dissociation for a typical combustion gas resulting from the combustion of a common natural gas with an air equivalence ratio of λ≈3
Grahic Jump Location
Deviations of isobaric heat capacities cp,diso calculated with the new simplified dissociation model, Eq. (47), from values cp,reao calculated with an iterative chemical equilibrium algorithm, 3, for a typical combustion gas resulting from the combustion of a common natural gas with an air equivalence ratio of λ≈3
Grahic Jump Location
Deviations of ideal gas isobaric heat capacities at 0.1 MPa calculated with Eq. (47) for combustion gases resulting from combustions of a common natural gas at different air equivalence ratios λ from values calculated with an iterative chemical equilibrium algorithm, 3
Grahic Jump Location
Percentage deviations of isobaric heat capacities of dry air calculated with 5 (i.e., considering real gas behavior) from those calculated using Eq. (15) for the corresponding ideal gas mixture
Grahic Jump Location
Absolute deviations of enthalpies of dry air calculated with 5 (i.e., considering real gas behavior) from those calculated using Eq. (16) for the corresponding ideal gas mixture
Grahic Jump Location
Absolute deviations of enthalpies of typical combustion gases calculated with 6 (i.e., considering real gas behavior) from those calculated using Eq. (16) for the corresponding ideal gas mixture
Grahic Jump Location
Deviations of isentropic and polytropic efficiencies for the compression of dry air (for different outlet pressures p2) calculated considering real gas effects, 5, from efficiencies calculated using Eqs. (16), (17) for the corresponding ideal gas mixture
Grahic Jump Location
Deviations of isentropic and polytropic efficiencies for the expansion in a gas turbine (for different inlet pressures p1) calculated considering real gas effects, 6, from efficiencies calculated using Eqs. (16), (17) for the corresponding ideal gas mixture (all values calculated for a combustion gas resulting from the combustion of a common natural gas at λ≈3)

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