{"title":"Thermodynamic Cycle Analysis for Overall Efficiency Improvement and Temperature Reduction in Gas Turbines","authors":"Jeni A. Popescu, Ionut Porumbel, Valeriu A. Vilag, Cleopatra F. Cuciumita","volume":100,"journal":"International Journal of Energy and Power Engineering","pagesStart":593,"pagesEnd":604,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10001041","abstract":"
The paper presents a thermodynamic cycle analysis
\r\nfor three turboshaft engines. The first cycle is a Brayton cycle,
\r\ndescribing the evolution of a classical turboshaft, based on the
\r\nKlimov TV2 engine. The other four cycles aim at approaching an
\r\nEricsson cycle, by replacing the Brayton cycle adiabatic expansion in
\r\nthe turbine by quasi-isothermal expansion. The maximum quasi-
\r\nEricsson cycles temperature is set to a lower value than the maximum
\r\nBrayton cycle temperature, equal to the Brayton cycle power turbine
\r\ninlet temperature, in order to decrease the engine NOx emissions.
\r\nAlso, the power\/expansion ratio distribution over the stages of the gas
\r\ngenerator turbine is maintained the same. In two of the considered
\r\nquasi-Ericsson cycles, the efficiencies of the gas generator turbine, as
\r\nwell as the power\/expansion ratio distribution over the stages of the
\r\ngas generator turbine are maintained the same as for the reference
\r\ncase, while for the other two cases, the efficiencies are increased in
\r\norder to obtain the same shaft power as in the reference case. For the
\r\ntwo cases respecting the first condition, both the shaft power and the
\r\nthermodynamic efficiency of the engine decrease, while for the other
\r\ntwo, the power and efficiency are maintained, as a result of assuming
\r\nnew, more efficient gas generator turbines.<\/p>\r\n","references":"[1] R.T. Balmer, \"Modern Engineering Thermodynamics\", Academic Press,\r\n2011\r\n[2] W. A. Sirignano, D. Dunn-Rankin, F. Liu, B. Colcord, S. Puranam,\r\n\"Turbine Burners: Flameholding in Accelerating Flow\", AIAA 2009 -\r\n5410 in Proc. 45th AIAA\/ASME\/SAE\/ASEE Joint Propulsion Conf. and\r\nExhibit, Denver, Colorado, USA, August 2009\r\n[3] D. G. Elliot, \"Two-Fluid Magneto-Hydrodynamic Cycle for Nuclear-\r\nElectric Power Generation\", ARS J., vol. 32, pp. 924-924, 1963\r\n[4] F. Liu, W.A. Sirignano, \"Turbojet and Turbofan Engine Performance\r\nIncreases through Turbine Burners\", J. Prop. Power, vol. 17, pp. 698-\r\n705, 2001\r\n[5] F. E. Marble, T. C. Adamson Jr., \"Ignition and Combustion in a Laminar\r\nMixing Zone\", Jet Prop., vol. 24, pp. 85, 1954\r\n[6] H. W. Emmons, \"Thin Film Combustion of Liquid Fuel\", Zeitschrift f\u00fcr\r\nAngewandte Mathematik und Mechanik, vol. 36, pp. 60, 1956\r\n[7] P. 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