On the actual power coefficient by theoretical developing of the diffuser flange of wind-lens turbine

Hasim A. Heikal, Osayed S.M. Abu-Elyazeed, Mohamed A.A. Nawar, Youssef A. Attai and Maged M.S. Mohamed

Renewable Energy, 2018, vol. 125, issue C, 295-305

Abstract: The wind-lens technology attracts extensive attention due to its promising performance. A numerical study was carried out to investigate the effects of diffuser flange inclination angle (φ) and the diffuser flange depth inside the exit of the diffuser (hi/Drotor) on the wind-lens turbine system performance. Besides, the effect of wind speed is taken into consideration. φ is changed through the range of −15° to 15° with a step of 5° in both forward and backward directions. Also, hi/Drotor is changed through the range of 0–0.06 with a step of 0.02 and wind speed of (8 and 10 m/s). A CFD model was developed and solved by using ANSYS FLUENT 16.2. Such model was validated by using previous published experimental results with good agreement and maximum deviation of 2.4%. It was found that the percentage increase of Cp at different values of φ was increased by augmenting of λ. Thus, it is emphasized that the maximum percentage increase of Cp of 28% was obtained at λ of 5.6 and φ of 10°. Moreover, a theoretical correction of Cp was performed to achieve that the actual power coefficient Cpact never exceeds Betz limit.

Keywords: Wind energy; Wind-lens turbine; Flanged diffuser; CFD (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (16)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:125:y:2018:i:c:p:295-305

DOI: 10.1016/j.renene.2018.02.100

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