Abstract This discussion is based on the paper by Mamouri et al. (2019) (hereafter identified as “the original authors” or “the original paper”). The original authors employed computational fluid dynamics to calculate the flow field around several wind turbine airfoils, and combined this with an evaluation of the entropy generation to estimate the second law efficiency. It came to our attention that the equations used to estimate the entropy generation, and in particular the term that is used to estimate the entropy generated by turbulent fluctuations, are incorrect. In addition, the original authors claim that one of the main contributions of their work is the identification of a relation between entropy generation and drag, probably ignoring that the same relation has been known and used by several authors in the past, and examples can be found from at least 60 years ago.

中文翻译：

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Mamouri, AR, Khoshnevis, AB 和 Lakzian, E. 对“S825、S822 和 SD7062 海上风力涡轮机翼型几何形状的熵生成分析”的讨论。

摘要 本讨论基于 Mamouri 等人的论文。（2019）（以下称为“原作者”或“原论文”）。最初的作者采用计算流体动力学来计算几个风力涡轮机翼型周围的流场，并将其与熵生成的评估相结合，以估计第二定律效率。我们注意到用于估计熵产生的方程，特别是用于估计湍流波动产生的熵的术语是不正确的。此外，原作者声称他们工作的主要贡献之一是识别了熵生成和阻力之间的关系，可能忽略了过去几位作者已经知道并使用了相同的关系，