Unformatted text preview: EML 4551 • Ethics and Senior Design Organization • Spring 2011 d
Florida International University • Department of Mechanical and Materials Engineering • Miami SENIOR DESIGN ORGANIZATION PROJECT DESCRIPTIONS Spring 2011 DESIGN OPTIMIZATION OF WINGLETS FOR WIND TURBINE ROTOR BLADES Team 2: Rinaldo Gonzalez, Diego Moreno, Juancarlo Ro driguez One of the major challenges in this century is ener gy efficiency as well as the increased production of energy from renewable sources. Geot hermal, solar, wind and hydroelectric power have been explored and developed as feasi ble forms of alternative energy. The technologies is the key to ensure the affordability and performance of renewable energy t
availability to the mass market. This Senior Design Project seeks to optimize the design of winglets for wind turbine rotor blades. Winglets are wing tip devices commonly used in the aeronautical industry to reduce drag on airplanes. However, some investigations have shown that these winglets can be used on wind turbine blades in order to maximize the powe r produced by the turbine. This type of application in rotating machinery is a fairly recent subject and some research has been performed by scientists at the RISO National Laboratory in Denmark. The project will involve the modeling of wind turbi ne winglets using computational fluid dynamics (CFD) with a turbulent model integrated in th e simulation in order to better account for the fluid forces and aerodynamic analysis of the wiinglet at the tip of the rotor blade. Only one blade design will be used for the purpose of this pr oject. An initial batch of winglet designs will be analyzed with inviscid Euler‐based CFD. The designs in this batch will be dependent on twist, toe, sweep and cant angles. From this initial gr oup, a minimum of 10 designs will be selected and further modeled with fully turbulent viscous CFD. The optimization process will be based on the response surface method (RSM) usin g an optimizer algorithm available at MAIDROC. The two objective functions are the maxim ization of mechanical power and the minimization of drag. The design variables impleme nted will be the angles defining the geometry of the winglet as previously explained. Based on the results presented in the available literature, it is expected that the use of winglets will yield an increase of 1 ‐ 3% of the coefficient of powe r. EML 4551 • Ethics and Senior Design Organization • Spring 2011 Florida International University • Department of Mechanical and Materials Engineering • Miami Moreover, it has been shown that the increase in mechanical power is accompanied by an increase in thrust forces. In order to evaluate the effects of this increase in thrust on the structure of the wind turbine, a structural study of the final design will be performed via finite element analysis (FEA). Once the computational modeling and design are completed, the rotor blade and winglet will be printed in a rapid 3D prototype for testing procedures to be completed in a wind tunnel testing facility. The proper materials and manufacturing process will be investigated for this purpose. A scaled three blade horizontal axis turbine with and without winglets will be tested for comparison and validation given the numerical results obtained by CFD and FEA. The electrical power output of the turbines will be the primary testing variable for this experiment. In terms of the global learning components, the application of wind power technology will be explored as a remote power generation tool in developing countries. In addition, researchers from Italy, Spain, Denmark and Japan will be contacted for discussion and collaboration about this project. A literature survey will be conducted on international standards for wind turbine design, and the design developed will be in compliance with international design codes. ...
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