In this paper, a numerical investigation on the effect of gurney flap (GF) on the performance of a diffuser augmented wind turbine (DAWT) is presented. The flow-field around the DAWT is obtained by solving the Reynolds-averaged-Navier-Stokes (RANS) equations. The turbine is modelled as an uniformly loaded actuator disc (AD) that imposes a resistance to the passage of the flow. Comparison of the numerical results with experimental measurements in similar conditions shows that the numerical approach used satisfactorily reproduces the mean flow field. GF heights equal to 2% and 4% of the diffuser chord length were investigated. Results show that separation induced by GF creates a low pressure region at the diffuser exit, that increases the mass flow through the diffuser and the power coefficient of the DAWT.

Effects of gurney flap on the performance of diffuser augmented wind turbines / Dighe, V. V.; Avallone, F.; Tang, J.; van Bussel, G. J. W.. - (2017). (Intervento presentato al convegno 35th Wind Energy Symposium, 2017 tenutosi a usa nel 2017).

Effects of gurney flap on the performance of diffuser augmented wind turbines

Avallone F.;
2017

Abstract

In this paper, a numerical investigation on the effect of gurney flap (GF) on the performance of a diffuser augmented wind turbine (DAWT) is presented. The flow-field around the DAWT is obtained by solving the Reynolds-averaged-Navier-Stokes (RANS) equations. The turbine is modelled as an uniformly loaded actuator disc (AD) that imposes a resistance to the passage of the flow. Comparison of the numerical results with experimental measurements in similar conditions shows that the numerical approach used satisfactorily reproduces the mean flow field. GF heights equal to 2% and 4% of the diffuser chord length were investigated. Results show that separation induced by GF creates a low pressure region at the diffuser exit, that increases the mass flow through the diffuser and the power coefficient of the DAWT.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2977183