A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser

Koichi Watanabe and Yuji Ohya
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Koichi Watanabe: Kyushu University Platform of Inter/Transdisciplinary Energy Research, Kyushu University, Fukuoka 816-8580, Japan
Yuji Ohya: Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan

Energies, 2021, vol. 14, issue 12, 1-15

Abstract: We developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of about 2–5 compared with a bare wind turbine for a given turbine diameter and wind speed. The increase in power output depends on the diffuser shape and length and the brim height. However, a simple theory presented in this paper argues that only two performance coefficients are needed to predict the performance of WLT. The coefficients are the back pressure coefficient of the brim and the pressure recovery coefficient of the diffuser. We theoretically showed that the back pressure coefficient was particularly important for the performance of WLT. Finally, the simple theory was evaluated with experimental results. The results showed good agreement with each other.

Keywords: diffuser augmented wind turbine; brim; wind lens technology; simple theory (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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