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RESEARCH ON THE PERFORMANCE IMPROVEMENT OF A TWO-SHAFT GAS TURBINE WITH A VARIABLE AREA NOZZLE POWER TURBINE

ABSTRACT

Both an increase in atmospheric temperature and a decrease in atmospheric pressure can lead to the degradation of the maximum allowable power output (MAPO) or the thermal efficiency of a gas turbine. In order to reduce these adverse effects, this paper provides a simulated study on the improvement of the MAPO and the variations of the thermal efficiency due to the fuel flow and variable area nozzle control under different atmospheric conditions. Simulation results indicate that the MAPO increases with the power turbine nozzle area, while the thermal efficiency shows a parabola trend. With the same increment of the power turbine nozzle area, the improvement of the MAPO goes up as the atmospheric temperature rises and the decrease of thermal efficiency is alleviated. Analyses show that the slow degradation of the compressor isentropic efficiency is a key factor that enables the MAPO to increase significantly and the thermal efficiency to remain almost constant.

KEYWORDS

two-shaft gas turbine, power output improvement, variable area nozzle, performance simulation

PAPER SUBMITTED: 2018-04-07

PAPER REVISED: 1970-01-01

PAPER ACCEPTED: 2019-04-07

PUBLISHED ONLINE: 2019-04-07

DOI REFERENCE: https://doi.org/10.2298/TSCI180714099L

CITATION EXPORT: view in browser or download as text file

THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE No. 6, PAGES [3721 - 3733]

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Research on the performance improvement of a two-shaft gas turbine with a variable area nozzle power turbine

© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence

THERMAL SCIENCE

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Shiyao Li

Zhenlin Li

Hongbin Zhao

RESEARCH ON THE PERFORMANCE IMPROVEMENT OF A TWO-SHAFT GAS TURBINE WITH A VARIABLE AREA NOZZLE POWER TURBINE