Diffuser Total Efficiency Using Generalized Actuator Disc Model and Its Maximization Method

Shigeo Yoshida, Masataka Motoyama, Peter Jamieson and Koij Matsuoka
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Shigeo Yoshida: Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
Masataka Motoyama: Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Peter Jamieson: Wind Energy Systems CDT, Department of Electric and Electrical Engineering, Royal College Building, University of Strathclyde, 204, George Street, Glasgow G1 1XW, UK
Koij Matsuoka: Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan

Energies, 2021, vol. 14, issue 4, 1-16

Abstract: The diffuser total efficiency was formulated and defined based on the generalized actuator disc model for the index of the efficiency of the diffuser-alone of the diffuser-augmented wind turbines. An optimization method to maximize the diffuser total efficiency was developed using a genetic algorithm and axisymmetric computational fluid dynamics. A case study was conducted for a 10% chord-to-diameter ratio, 2% thickness-to-chord plate, and the crest position at 50% chord of the diffuser. The optimal result showed a diffuser total efficiency of 1.087. Furthermore, 1392 (=48 population × 29 generations) simulation cases of the optimization process showed that high diffuser total efficiency appears at a low-drag coefficient, high-lift coefficient, and 15–25% low diffuser height-to-chord ratio.

Keywords: total power coefficient; total diffuser efficiency; generalized actuator disc (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
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