2015
DOI: 10.1590/0001-3765201520140114
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Abstract: 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 th… Show more

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Cited by 17 publications
(8 citation statements)
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References 13 publications
(10 reference statements)
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“…Figure 9 shows the diffuser effect on the power coefficient of an ordinary wind turbine. It is observed that the diffuser improves the efficiency, as shown in Phillips (2003) and Barbosa (2015). In this regard, note that the better results were obtained for the Diffuser 3, which provided 74% of maximum extracted energy, having as a consequence an exceeding produced energy above Betz-Joukowsky limit.…”
Section: Diffuser Effect On the Classical Theorymentioning
confidence: 72%
See 3 more Smart Citations
“…Figure 9 shows the diffuser effect on the power coefficient of an ordinary wind turbine. It is observed that the diffuser improves the efficiency, as shown in Phillips (2003) and Barbosa (2015). In this regard, note that the better results were obtained for the Diffuser 3, which provided 74% of maximum extracted energy, having as a consequence an exceeding produced energy above Betz-Joukowsky limit.…”
Section: Diffuser Effect On the Classical Theorymentioning
confidence: 72%
“…From these findings, the idea of using diffusers in turbines was abandoned until 1950, when Sanuki (1950) published experimental results of a DAWT indicating a power increase of 88% over the Betz-Joukowsky limit. As further described by Barbosa et al (2015), the increase in power of a wind turbine results from two main mechanisms: increasing the mass flow and turbulent flow with external mixing. To improve the efficiency of a DAWT, some concepts have been used alone or in combination, such as: vortex generator, cylindrical obstruction and creating diffuser effect, as also reported by Phillips (2003).…”
Section: Diffuser-augmented Wind Turbinesmentioning
confidence: 98%
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“…The impact of area ratio upon DAWT performance is still not completely clear, since increasing area ratio typically results in an increasing recirculation zone behind diffuser [7], leading in general to a decrease in pressure, but this does not lead to more energy extraction by the turbine. More detail on this regard can be found in Barbosa et al [28], who developed a mathematical model based on the BiotSavart law to describe the internal velocity for three conical diffusers, taking into account the characteristics of flow around them. Even for a higher area ratio, the internal velocity remained low.…”
Section: Optimizing Dawt Power Outputmentioning
confidence: 99%