masterThesis
Estudo do efeito de intempéries regionais na deterioração de pás eólicas
Fecha
2018-05-30Registro en:
SILVA, Ranaildo Gomes da. Estudo do efeito de intempéries regionais na deterioração de pás eólicas. 2018. 85f. Dissertação (Mestrado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2018.
Autor
Silva, Ranaildo Gomes da
Resumen
Nowadays, there is a growing demand for alternative and clean energy sources that
do not cause great negative effects on the environment and the need to take advantage
of the global wind potential is increasing. However, the wind power industry specifically
the wind turbines manufacturers, constantly seek for improvements and good
performance of the mechanical properties of the materials used in the manufacture of
wind turbines. In this way, knowing the behavior of the materials used is of fundamental
importance so that one can better take advantage of the winds and consequently avoid
damages and accidents. The objective of the present work was to evaluate in wind
tunnel the effect of sand and salt particles on the surface of wind turbines. For the
tests, were used specimens based on orthophthalic resin coated with blanket and
fiberglass fabrics were commonly used as the most widely used material for wind
turbine. Was analyzed, in wind tunnel, a section of wind turbine with size of 17 cm x
2.5 cm, model of NACA 7715 in the preparation of the specimens. Were made 15
assays and various angles of attack were made at 0 °, 45 ° and 90 ° for every 12 hours
of assay, the total of 180 hours of testing for both sand and salt wastes. Computational
simulations, tensile tests, flexural tests, mass loss, roughness and scanning electron
microscopy (SEM) were performed on all specimens after the tests. The computational
simulation allowed to visualize the aerodynamic behavior inside the tunnel and to
determine the most stable place for fixation of the specimen. The tensile and flexion
tests allowed to identify the maximum strengths of the material used. The roughness
tests confirm the changes that occurred in the microstructure and the scanning electron
microscopy (SEM) characterization technique identified the changes, faults and
behavior between matrix and reinforcement.