Mestrado em Engenharia Ambiental e Sanitária (EEC)
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Navegando Mestrado em Engenharia Ambiental e Sanitária (EEC) por Por Orientador "Mariano, Felipe Pamplona"
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Item Caracterização experimental de túneis de vento para a análise de potencial eólico(Universidade Federal de Goiás, 2020-08-27) Cardoso, Flávia de Melo Ribeiro; Mariano, Felipe Pamplona; http://lattes.cnpq.br/4538460201961283; Mariano, Felipe Pamplona; Fagundes Neto, Marlipe Garcia; Vasco, Joel Roberto GuimarãesWind tunnel is an equipment used to study aerodynamics, whose main function is to provide high quality air flow in its test section. It makes possible to study the effects of air flow around various aerodynamic or non-aerodynamic models (airfoils, blunt bodies, anemometric towers, reduced models of civil structures and others). The qualities to be satisfied when using a wind tunnel are: a low level of turbulent intensity at the entrance of its test section, meaning uniformity in the speed and pressure fields and the height of the boundary layer formed along the length of the test section. The knowledge of both variables for the various ranges of use of the wind tunnel guarantees the appropriate boundary conditions for the experiments and makes it a reliable measuring equipment. For example, a high turbulent intensity can interfere considerably in the transition of the boundary layer, generating undesirable effects. Furnas Centrais Elétricas S.A. acquired two wind tunnels, the purpose of which is the in-depth study of the wind power generation system. To know the characteristics of the tunnels is essential in the exchange of technical and scientific information, in the comparison of experimental results, in the extrapolation of model parameters to the real scale and in the simulation of tests in Computational Fluid Dynamics. Through experimental measures, using Pitot tubes and statistical tools such as experimental planning techniques and analysis of variance (ANOVA), the turbulent intensity of approximately 0.5% was found at wind tunnel (TV1) for speeds above 12.0m/s and for speeds below 12.0m/s, the turbulent intensity increased up to 3.5% for speeds around 5.0m/s. A method of controlling the height of the boundary layer is also presented, in order to be able to study the wind potential of a given terrain.Item Simulação computacional de escoamentos bidimensionais sobre turbinas eólicas de eixo vertical(Universidade Federal de Goiás, 2018-08-31) Faria, Geovanne Silva; Mariano, Felipe Pamplona; http://lattes.cnpq.br/4538460201961283; Mariano, Felipe Pamplona; Kinoshita, Denise; Vasco, Joel Roberto GuimarãesThe Brazilian energy matrix is highly focused on hydroelectric plants, that have been affected by lack of rain and long drought periods. It’s necessary to invest on alternative kinds of energy. The wind energy is an option, since Brazil presents winds with suitable velocity for energy generation, less than 5% of the Brazilian energy power grid is composed by wind turbines. The present work aims to contribute to the alternative energy generation industry, having as objective the study and analysis of flow condition over airfoils of vertical axis wind turbines. The simulation of flow over airfoils were performed using the Pseudo-Spectral Fourier method together with the Immersed Boundary method for discretization of the spatial domain, and the Runge-Kutta method of fourth order for discretization of the time domain. Both instantaneous and mean values were recorded for the lift (Cl) and drag coefficient (Cd), as well as the fields of vorticity, pressure and velocity for the flow over the airfoils with distinctive characteristics of form and angle of attack. It is concluded that with this first experiment, by refining the mesh, the values for Cl and Cd get close to the references. Posteriorly, it was imposed the movement of rotation of one vertical axis wind turbine, and simulated the flow over this turbine blades, when it was recorded both the instantaneous and mean values of the lift, drag and power coefficient, as well as the fields of vorticity, pressure and velocity for different values of velocities of turbine rotation for the airfoils NACA 0008 and NACA 4308. It was possible to conclude by analyzing the values of power coefficient (Cp), Cl and Cd obtained through simulation with the turbines that the airfoil NACA 0008 can be utilized for energy generation, since the airfoil NACA 4308 cannot be utilized in the adopted speed ranges.Item Estimativa do potencial eólico a partir de experimento em túnel de vento utilizando placa plana de camada limite(Universidade Federal de Goiás, 2023-12-21) Maia, Cássia Silva de Azevedo; Fagundes Neto, Marlipe Garcia; http://lattes.cnpq.br/6303674803792521; Mariano, Felipe Pamplona; http://lattes.cnpq.br/4538460201961283; Mariano, Felipe Pamplona; Vasco, Joel Roberto Guimarães; Moreira, Leonardo de QueirozConcern about environmental imbalances is frequent throughout the world and investment in clean and renewable energy is increasing progressively. The assessment of wind resources becomes increasingly challenging, as it takes into account environmental parameters, such as climate fluctuations, in addition to financial expenses in feasibility studies for the construction of wind farms. For these studies, the estimation of wind potential uses numerical and experimental models as a complement to field measurements. This work refers to the experimental study in a wind tunnel made, available by FURNAS of the atmospheric boundary layer variation from an apparatus known as a flat boundary layer plate, which contains installed pressure probes and a flap mechanism installed on the trailing edge. Different combinations of angles (-10°, +10°, 0°, -20°, +20°) and velocities (6, 13, 20, 26 and 33 m.s-1 ) were made. The results obtained show that, when modifying the flap positioning angle, the boundary layer generated on the plate undergoes significant changes. When analyzing the angle separately for each speed, the boundary layer generated is significantly different for all speeds studied. The wind potential was better at high speeds and had a slight increase at negative flap angles.