The present book focus on the improvement of the efficiency of the vertical axis rotors by optimizing the geometrical parameters of the rotors or by using the augmentation techniques of the water velocity upstream of the rotor. In fact, we have presented a numerical model to characterize the water flow around the vertical axis rotors. For thus, we have used the commercial CFD code Ansys Fluent which has been an effective implement used by researchers to give a required modeling for a wide range of fluid while taking into account the nature of the fluid flow. In fact, it allows engineers to determine the optimized geometric settings. The finite volume method was employed to resolve the NS equations.
Due to water turbulent characteristics in the vicinity of the VAWRs, the selection of parameters of the computational model is very sensitive. In fact, computational results showed that the grid element numbers, the TM and the rotting area diameter affected directly the computational outcomes.
By considering these adequate parameters, experimental and computational simulations of spiral Darrieus turbine were performed. At first, we have presented the experimental procedure carried out to evaluate the performance of the spiral Darrieus turbine with the necessary used instrumentations. Experimental outcomes were primordial to validate the used computational model. Then, we have introduced the computational model used to characterize the water flow in the vicinity of the tested turbine and to assess the spiral angle influence on the performance parameters of the Darrieus turbine. Different spiral angle were tested (Ranging from 10° to 40°). From the numerical outcomes, it was found that the flow field and the performance characteristics were improved with spiral angle of 30°.
The volume 5, is a useful handbook for engineers involved in power plant design and renewable energy sectors who are studying the computational fluid dynamics of vertical axis turbines (such as Darrieus turbines) that are used in hydropower projects.
About the Authors:
Dr. Mabrouk Mosbahi is an Assistant Professor in the Department of Mechanical Engineering at ISET of Sidi Bouzid. He received his Engineering Diploma in 2014 from ENIS at the University of Sfax, Tunisia and his Ph.D.in 2019 in Mechanical Engineering from ENSIT at University of Tunis, Tunisia. He is interested in the development of numerical and experimental techniques for solving problems in mechanical engineering. Also, his research field includes fluid power and Renewable Energy (Hydro, Solar, Wind and Biomass).
Dr. Ahmed Ayadi received his Engineering Diploma in 2014 and his Ph.D. in 2017 in Mechanical Engineering from the National Engineering School of Sfax, Tunisia. He is interested in the development of numerical and experimental techniques for solving problems in mechanical engineering and energy applications. Also, his research has been focused on Computational Fluid Dynamics (CFD). As a result of his research, he is principal or co-principal investigator of several published papers in peer-reviewed journals. Currently, Dr. Ayadi is a member of the project “Optimization of Energy Systems” in the Laboratory of Electromechanical Systems and a reviewer for different international journals.
Prof. Zied Driss is Full Professor in the National School of Engineers of Sfax. He received his Engineering Diploma in 2001, his Master Degree in 2003, his Ph.D. in 2008 and his HDR in 2013, in Mechanical Engineering from ENIS at the University of Sfax, Tunisia.
He is interested in the development of numerical and experimental techniques for solving problems in mechanical engineering and energy applications. As a result of his research, he is principal or co-principal investigator on more than 180 papers, more than 350 communications, 25 books and 70 books chapters. Also, he is the main inventor of 10 patents.
CFD method, Savonius hydraulic turbine, vertical axis rotors, aspect ratio, Savonius water turbine,
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