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| BARBOSA,DISTERFANO L.M.; VAZ,JERSON R.P.; FIGUEIREDO,SÁVIO W.O.; SILVA,MARCELO DE OLIVEIRA E; LINS,ERB F.; MESQUITA,ANDRÉ L.A.. |
| The Diffuser Augmented Wind Turbines (DAWTs) have been widely studied, since the diffusers improve the power coefficient of the wind turbine, particularly of small systems. The diffuser is a device which has the function of causing an increase on the flow velocity through the wind rotor plane due to pressure drop downstream, therefore resulting in an increase of the rotor power coefficient. This technology aids the turbine to exceed the Betz limit, which states that the maximum kinetic energy extracted from the flow is 59.26%. Thus, the present study proposes a mathematical model describing the behavior of the internal velocity for three conical diffusers, taking into account the characteristics of flow around them. The proposed model is based on the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DAWTs; Diffusers; Wind energy; Biot-Savart's law. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201133 |
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| SILVA,PAULO A.S.F.; OLIVEIRA,TAYGOARA F. DE; BRASIL JUNIOR,ANTONIO C.P.; VAZ,JERSON R.P.. |
| ABSTRACT Over the years most studies on wake characteristics have been devoted to wind turbines, while few works are related to hydrokinetic turbines. Among studies applied to rivers, depth and width are important parameters for a suitable design. In this work, a numerical study of the wake in a horizontal-axis hydrokinetic turbine is performed, where the main objective is an investigation on the wake structure, which can be a constraining factor in rivers. The present paper uses the Reynolds Averaged Navier Stokes (RANS) flow simulation technique, in which the Shear-Stress Transport (SST) turbulent model is considered, in order to simulate a free hydrokinetic runner in a typical river flow. The NREL-PHASE VI wind turbine was used to validate the numerical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrokinetic turbines; Wake characteristics; CFD; Turbulence. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602441 |
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