Computational analysis of horizontal axis hydrokinetic turbine with and without diffuser
DOI:
https://doi.org/10.33131/24222208.286Keywords:
CFD, kinetic energy, peak power generation, renewable energyAbstract
Hydraulic turbines use the energy contained in the water flow of mares, rivers, canals, among others, to generate electricity. The main advantage of these turbines is that they do not need dams, due to their operation is independent of water heads, it became a low-cost technology.
Currently, the most successful cases of operational hydrokinetic turbines are in Europe, but Brazil has marked a great trend in the study and implementation of these. This work presents the transient computational analysis of a horizontal axis hydrodynamic turbine made in the ANSYS CFX V16.2® program. The turbine is constituted by three blades with hydrodynamic profile NREL S822 and angle of attack of 5 °. It is also analyzed a diffuser, generated from the same hydrodynamic profile, to evaluate its effect on the behavior of the turbine. A water
velocity of 1.5 m/s and a variation of the angular velocity between 0 and 300 RPM were used as operating conditions for the simulation. As a result, the power generated as a function of the angular velocity is obtained for both models. The highest power generated by the turbine with and without diffuser was 879.7 W at 180 RPM and 845.9 W at 200 RPM, respectively, equivalent to an increase of 3.84%.
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