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Thermodynamic model of the expansion process in a cooled gas turbine

  • Steam-Turbine, Gas-Turbine, and Combined-Cycle Plants and Their Auxiliary Equipment
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Abstract

A method for calculating the expansion process in a gas turbine with open cooling, which is represented as a thermodynamic system with a variable mass consisting of two subsystems (a gas subsystem with a constant mass and a coolant subsystem with a variable mass) is proposed. An analytical solution of the system of equations describing the expansion process is presented. The accuracy and validity of the obtained results are demonstrated. This method allows one to analytically calculate the expansion process parameters (including the losses caused by cooling). The results of calculation of these losses for various values of the cooling system efficiency and the gas temperature at the turbine inlet are given. The exergy analysis of losses in a setup with a cooled turbine is performed. It is demonstrated that the cooling losses may amount to 5% (or more) of the fuel energy and may not be compensated by the waste-heat loop efficiency in a combined-cycle unit. The obtained results are compared with the published data on the GTE-65 unit produced by Silovye Mashiny.

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Authors and Affiliations

  1. St. Petersburg State Polytechnic University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia

    G. A. Romakhova

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  1. G. A. Romakhova
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Correspondence to G. A. Romakhova.

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Original Russian Text © G.A. Romakhova, 2015, published in Teploenergetika.

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Romakhova, G.A. Thermodynamic model of the expansion process in a cooled gas turbine. Therm. Eng. 62, 103–109 (2015). https://doi.org/10.1134/S004060151502007X

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  • DOI: https://doi.org/10.1134/S004060151502007X

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