Reply to: 'Discussion on entropy generation analysis of S825, S822, and SD7062 offshore wind turbine airfoil geometries by Tiziano Ghisu, Francesco Cambuli'

Autor: Esmail Lakzian, Amir Reza Mamouri, Abdolamir Bak Khoshnevis
Rok vydání: 2020
Předmět:
Zdroj: Ocean Engineering. 206:107016
ISSN: 0029-8018
DOI: 10.1016/j.oceaneng.2020.107016
Popis: This reply is based on the discussion by Ghisu and Cambuli. With great interest, the authors have read the comments made by Ghisu and Cambuli. The comments severely criticizes our methodology and results, which actually provide us with fortunate opportunity to discuss our work in more details to complement our work, thankfully to this available space of scientific discourse provided by Ocean Engineering Journal editors. The original paper employed computational fluid dynamics to calculate the flow field around wind turbine airfoils, and combined this with an evaluation of the entropy generation to estimate the second law efficiency. Ghisu and Cambuli believe that the entropy equations presented in the turbulent state are incorrect. But Kock and Herwig introduced the following expression for modeling, also it should be noted that other researches have used this method as well. Ghisu and Cambuli also claimed that the relationship between entropy and the drag coefficient is not innovation and this relationship has already been established by Ghisu et al. In this regard, for first time, this relationship is presented as a relation for S822, S825, and SD7062 in wind turbines. In this paper, it is worth mentioning that all the equations expressed are taken from the references which are given below and the authors have not added or subtracted any hypotheses themselves. It is also worth noting that the entropy is aimed at reducing energy consumption, which is directly related to the drag coefficient, and this finding was not obtained by the authors of the paper and Ghisu and Cambuli and is understandable by the study of thermodynamics.
Databáze: OpenAIRE
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