The calculation of the performance of gas turbines, turbochargers, compressors and turbines requires the thermodynamic properties of the gases. Tables of properties exist which are effectively exact, but using these tables is tedious and far from practical in computer-based calculations. Representing tabulated results with polynomial approximations is inconvenient and prone to error in implementation. For teaching and simple calculations simple approximations, such as γ = 1.4 for unburned air and γ = 1.3 for combustion products, are sometimes used, but this is far from wholly satisfactory. This paper describes and discusses a simple empirical approach which will give adequate accuracy for many purposes but is simple enough to be used as part of an educational course.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4575-2
PROCEEDINGS PAPER
An Approximate Method to Obtain Thermodynamic Gas Properties for Use in Gas Turbines
N. A. Cumpsty,
N. A. Cumpsty
Imperial College London, London, UK
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A. J. Marquis
A. J. Marquis
Imperial College London, London, UK
Search for other works by this author on:
N. A. Cumpsty
Imperial College London, London, UK
A. J. Marquis
Imperial College London, London, UK
Paper No:
GT2014-26205, V006T08A005; 7 pages
Published Online:
September 18, 2014
Citation
Cumpsty, NA, & Marquis, AJ. "An Approximate Method to Obtain Thermodynamic Gas Properties for Use in Gas Turbines." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy. Düsseldorf, Germany. June 16–20, 2014. V006T08A005. ASME. https://doi.org/10.1115/GT2014-26205
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