Journal ArticleDOI
Entropy analysis of pitching airfoil for offshore wind turbines in the dynamic stall condition
TLDR
In this paper, the entropy generation rate is considered as a criterion in the analysis of this mechanism and also a tool for accurate designing, which could be a strong tool to design accurate and offshore wind turbines with lower losses in near future.About:
This article is published in Ocean Engineering.The article was published on 2019-09-01. It has received 24 citations till now. The article focuses on the topics: Airfoil & Angle of attack.read more
Citations
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Journal ArticleDOI
Thermoeconomic analysis and optimization of a geothermal-driven multi-generation system producing power, freshwater, and hydrogen
Maziyar Hekmatshoar,Mahdi Deymi-Dashtebayaz,Mohammad Mostafa Gholizadeh,Daryoush Dadpour,Mostafa Delpisheh +4 more
TL;DR: In this paper , a geothermal-driven multi-generation system cogenerating power, freshwater, and hydrogen is proposed, comprised of multi-effect distillation (MED), organic Rankine cycle (ORC), and proton exchange membrane (PEM) electrolyzer.
Journal ArticleDOI
Energy loss evaluation in a Francis turbine under overall operating conditions using entropy production method
TL;DR: In this paper, a full analysis for flow losses in a Francis turbine with the entropy production method has been implemented, and the prediction of hydraulic efficiency between entropy production theory and the model test is compared.
Journal ArticleDOI
Improvement of aerodynamic performance of an offshore wind turbine blade by moving surface mechanism
Erfan Salimipour,Shima Yazdani +1 more
TL;DR: In this paper, the effects of a moving surface on the aerodynamic characteristics of an offshore wind turbine blade were numerically examined, where the S809 airfoil was considered as the blade section.
Journal ArticleDOI
Investigations of the thermodynamic entropy evaluation in a hydraulic turbine under various operating conditions
TL;DR: In this article, an entropy production method is applied to calculate the irreversible energy loss quantitatively and demonstrate the spatial distribution of energy loss intuitively, and a new definition of entropy production rate induced by cavitation is derived to reveal the internal interaction mechanism between cavitation process and entropy rate generation.
Journal ArticleDOI
Experimental study of the effective parameters on the offshore wind turbine's airfoil in pitching case
TL;DR: In this article, the aerodynamic coefficients of an oscillating wind turbine airfoil are evaluated, including reduced frequency, mean angle of attack, amplitude, and Reynolds number, in terms of real experimental conditions.
References
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Book
Turbulence modeling for CFD
TL;DR: In this paper, the authors proposed a compressible ecoulement for compressible ECCs, based on the disquette reference record created on 2005-11-18, modified on 2016-08-08.
Journal ArticleDOI
Second law analysis in heat transfer
TL;DR: In this article, the second law of thermodynamics is used as a basis for evaluating the irreversibility associated with simple heat transfer processes, such as heat augmentation techniques, heat exchanger design, and thermal insulation systems.
The phenomenon of dynamic stall
TL;DR: In this paper, the general features of dynamic stall on oscillating airfoils are explained in terms of the vortex shedding phenomenon, and the important differences between static stall, light dynamic stall, and deep stall are described.
Journal ArticleDOI
Local entropy production in turbulent shear flows: a high-Reynolds number model with wall functions
Fabian Kock,Heinz Herwig +1 more
TL;DR: In this article, entropy production in incompressible turbulent shear flows of Newtonian fluids is analyzed systematically and incorporated into a CFD code, based on asymptotic considerations wall functions for the four production terms are developed.
Related Papers (5)
Entropy generation analysis of S825, S822, and SD7062 offshore wind turbine airfoil geometries
Local entropy production in turbulent shear flows: a high-Reynolds number model with wall functions
Fabian Kock,Heinz Herwig +1 more