Second-Law Analysis of Irreversible Losses in Gas Turbines

Entropy

Yan Jin¹  Zhiyuan Li²  Juan Du²  Hongwu Zhang² 

[1] 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;

关键词: second-law analysis;    entropy;    exergy;    gas turbine;    cascade;    Brayton cycle;    computational fluid dynamics (CFD);   

DOI  :  10.3390/e19090470

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown