Análise computacional via CFD de uma turbina hidrocinética em condutos abertos

• Ano de defesa: 2019
• Autor(a) principal: Leirisson Patrick Santos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: CFD; Coeficiente de potência; Rotor esférico-helicoidal; Turbina hidrocinética; Dinâmica dos fluidos computacional; Engenharia mecânica
• Link de acesso: http://hdl.handle.net/1843/RAOA-BCGFZ6

This work deals with the development of a computational procedure, based on a CFD commercial package, to analyze the behavior and the performance of hydrokinetic turbines. A preliminary performance analysis of three NACA airfoils, namely NACA 015, 0018, and 0020, is performed to select the more adequate airfoil for the blade design of an efficient hydrokinetic turbine runner. The selection of the airfoil for the runner blades is based on the geometric similitude with the airfoil geometric characteristics employed in the design of vertical wind turbines. The fluid dynamic analysis of the selected runner for the hydrokinetic turbine employs a turbulent model SST k-, which combines the shear-stress transport equation and a formulation for the inner parts of the boundarylayers. A case of commercial hydrokinetic turbine is chosen for validation of the implemented CFD procedure. The validation is performed by comparing the predicted CFD values of the coefficient of power with some experimental values available in the technical literature. Then, the fluid dynamic analysis of the spherical-helical runner for hydrokinetic turbines is performed for several flow conditions. Curves of the coefficient of power and estimates of the flow velocity fields in the region of the turbine show the behavior of turbine runner for different flow conditions. The computational results rendered for the the hydrokinetic turbine provide very useful information about the applicability and feasibility of hydrokinetic turbines in open flow channels.