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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Computational study of the wind flow in convergent-divergent nozzle
Submission Author:
Francisco Carlos Lima de Sousa , MT
Co-Authors:
Silmara Bispo dos Santos, Rodrigo Sabino Pereira, KETERI POLIANE MORAES DE OLIVEIRA, Francisco Carlos Lima de Sousa
Presenter: Francisco Carlos Lima de Sousa
doi://10.26678/ABCM.COBEM2017.COB17-1907
Abstract
The search for renewable energy sources has been growing in the last decades due to the concern with energetic demand and environmental impact caused by fossil and nuclear energy source. The wind energy has been proved as a promising renewable source. It has been widelly studied for its inexhaustible source of energy and no greenhouse gases emission. The present study aimed at evaluating the different nozzle geometries convergentdivergent for increasing wind velocity at the wind turbines entrance. For this study realization, computational fluid dynamics (CFD) technique was used. This technique allow us evaluating several parameters wich influence the increase in speed, as convergent-divergent angles and lenght relation at entrance and exit with the nozzle throat diameter. ANSYS Fluent was used for simulation and prediction of fluid flow velocity and pressure. The simulation was setup as a 2-D stationary, steady state, ideal gas analysis. The turbulence model used was SST k-ω method. The simulations were performed for free stream velocity of 4.5 m/s and for different shapes of convergent-divergent nozzle. The research indicated that one of the geometries among all the assessed nozzle, promoted a higher wind aceleration in the inner region of the nozzle. This geometry has an entry angle of 60°, throat length and diameter ratio of 1/8, being the divergent section an angle of 45º and length ratio of 1. In such conditions, the relation of increase in speed was 1.98.
Keywords
Nozzle, wind energy, CFD
