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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
1
Center of Applied Space Technology and Microgravity (ZARM), the University of Bremen, 28359 Bremen, Germany
2
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Entropy 2017, 19(9), 470; https://doi.org/10.3390/e19090470
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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