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Open AccessFeature PaperArticle

Second-Law Analysis of Irreversible Losses in Gas Turbines

by Yan Jin 1,*, Juan Du 2,*, Zhiyuan Li 2,3 and Hongwu Zhang 2
Center of Applied Space Technology and Microgravity (ZARM), the University of Bremen, 28359 Bremen, Germany
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
University of Chinese Academy of Sciences, Beijing 100049, China
Authors to whom correspondence should be addressed.
Entropy 2017, 19(9), 470;
Received: 26 July 2017 / Revised: 29 August 2017 / Accepted: 31 August 2017 / Published: 4 September 2017
(This article belongs to the Special Issue Entropy in Computational Fluid Dynamics)
Several fundamental concepts with respect to the second-law analysis (SLA) of the turbulent flows in gas turbines are discussed in this study. Entropy and exergy equations for compressible/incompressible flows in a rotating/non-rotating frame have been derived. The exergy transformation efficiency of a gas turbine as well as the exergy transformation number for a single process step have been proposed. The exergy transformation number will indicate the overall performance of a single process in a gas turbine, including the local irreversible losses in it and its contribution to the exergy obtained the combustion chamber. A more general formula for calculating local entropy generation rate densities is suggested. A test case of a compressor cascade has been employed to demonstrate the application of the developed concepts. View Full-Text
Keywords: second-law analysis; entropy; exergy; gas turbine; cascade; Brayton cycle; computational fluid dynamics (CFD) second-law analysis; entropy; exergy; gas turbine; cascade; Brayton cycle; computational fluid dynamics (CFD)
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Jin, Y.; Du, J.; Li, Z.; Zhang, H. Second-Law Analysis of Irreversible Losses in Gas Turbines. Entropy 2017, 19, 470.

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