2018/08/21 by Tiziano Ghisu, Ghisu, Tiziano, Francesco Cambuli +9
Engineering · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Fluid Dynamics and Vibration Analysis #Wave and Wind Energy Systems
paper · pdf · doi:10.48550/arxiv.1808.07030
openalex publication_date 2018/08/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In recent years, a number of authors have studied entropy generation in Wells\nturbines. This is potentially a very interesting topic, as it can provide\nimportant insights into the irreversibilities of the system, as well as a\nmethodology for identifying, and possibly minimizing, the main sources of loss.\nUnfortunately, the approach used in these studies contains some crude\nsimplifications that lead to a severe underestimation of entropy generation\nand, more importantly, to misleading conclusions.\n This paper contains a re-examination of the mechanisms for entropy generation\nin fluid flow, with a particular emphasis on RANS equations. An appropriate\nmethodology for estimating entropy generation in isolated airfoils and Wells\nturbines is presented. Results are verified for different flow conditions, and\na comparison with theoretical values is presented.\n