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International Journal of Turbo & Jet-Engines

Editor-in-Chief: Gal-Or, Benjamin

Ed. by Sherbaum, Valery / Erenburg, Vladimir

4 Issues per year


IMPACT FACTOR 2017: 0.425

CiteScore 2017: 0.52

SCImago Journal Rank (SJR) 2017: 0.175
Source Normalized Impact per Paper (SNIP) 2017: 0.567

Online
ISSN
2191-0332
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Volume 35, Issue 1

Issues

A Generalized Method for the Comparable and Rigorous Calculation of the Polytropic Efficiencies of Turbocompressors

Panagiotis Dimitrakopoulos
Published Online: 2018-02-15 | DOI: https://doi.org/10.1515/tjj-2016-0029

Abstract

The calculation of polytropic efficiencies is a very important task, especially during the development of new compression units, like compressor impellers, stages and stage groups. Such calculations are also crucial for the determination of the performance of a whole compressor. As processors and computational capacities have substantially been improved in the last years, the need for a new, rigorous, robust, accurate and at the same time standardized method merged, regarding the computation of the polytropic efficiencies, especially based on thermodynamics of real gases. The proposed method is based on the rigorous definition of the polytropic efficiency. The input consists of pressure and temperature values at the end points of the compression path (suction and discharge), for a given working fluid. The average relative error for the studied cases was 0.536 %. Thus, this high-accuracy method is proposed for efficiency calculations related with turbocompressors and their compression units, especially when they are operating at high power levels, for example in jet engines and high-power plants.

Keywords: Calculation; Efficiency; Performance; Thermodynamics; Turbocompressor

PACS: 02.60.Gf (Algorithms for Functional Approximation)

References

  • 1.

    The American Society of Mechanical Engineers, ASME PTC 10–1997, “Performance Test Code on Compressors and Exhausters”.

  • 2.

    Soave G. Equilibrium constants from a modified Redlich-Kwong equation of state. Chem Eng Sci 1972;27:1197–203.CrossrefGoogle Scholar

  • 3.

    Peng DY, Robinson DB. A new two-constant equation of state. Ind Eng Chem Fundam 1976;15(1):59–64.CrossrefGoogle Scholar

  • 4.

    Hebisch U. „Lösung kubischer Gleichungen“, Technische Universität Freiberg.

  • 5.

    Lee BI, Kesler MG. A generalized thermodynamic correlation based on three-parameter corresponding states. AIChE J 1975;21:510–27.CrossrefGoogle Scholar

  • 6.

    Wu GZA, Stiel LI. A Generalized Equation of State for the Thermodynamic Properties of Polar Fluids. AIChE J 1985;31(10):1632–44.CrossrefGoogle Scholar

  • 7.

    Mattingly JD. Elements of gas turbine propulsion. McGraw-Hill Series in Aeronautical and Aerospace Engineering. Singapore 638775: McGraw-Hill Book Co., 1996.Google Scholar

  • 8.

    Lüdtke KH. Process centrifugal compressors, basics, function, operation, design, application. Berlin, Heidelberg, New York: Springer-Verlag.Google Scholar

  • 9.

    Kouremenos DA, Antonopoulos KA. Isentropic exponents of real gases and application for the air at temperatures from 150 K to 450 K. Acta Mech 1986;65:81–99.Google Scholar

  • 10.

    Kouremenos DA, Kakatsios XK. The three isentropic exponents of dry steam. Forsch Ingenieurwes A 1985;51(4):117–22.CrossrefGoogle Scholar

  • 11.

    Alevizos E, Sidiropoulos G. Der Getriebeturboverdichter. Fortschritt-Berichte VDI Reihe 19 Wärmetechnik/Kältetechnik Nr. 160. Düsseldorf: VDI Verlag, 2009.Google Scholar

  • 12.

    Online source: http://www.jmcampbell.com/tip-of-the-month/ 2011/11/compressor-calculations- rigorous-using-equation-of-state-vs-shortcut-method.

  • 13.

    Graboski MS, Daubert TE. A modified soave equation of state for phase equilibrium calculations. 3. Systems containing hydrogen. Ind Eng Chem Process Des Dev 1979;18(2):300–6.CrossrefGoogle Scholar

  • 14.

    Assael MJ, Trusler JPM, Tsolakis TF. Thermophysical properties of fluids. London SW7 2BT: Imperial College Press, 1998.Google Scholar

About the article

Received: 2016-04-21

Accepted: 2016-05-18

Published Online: 2018-02-15

Published in Print: 2018-03-26


Citation Information: International Journal of Turbo & Jet-Engines, Volume 35, Issue 1, Pages 35–47, ISSN (Online) 2191-0332, ISSN (Print) 0334-0082, DOI: https://doi.org/10.1515/tjj-2016-0029.

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