Diffuser total efficiency using generalized actuator disc model and its maximization method

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Yoshida, Shigeo and Motoyama, Masataka and Jamieson, Peter and Matsuoka, Koij (2021) Diffuser total efficiency using generalized actuator disc model and its maximization method. Energies, 14 (4). 813. ISSN 1996-1073 (https://doi.org/10.3390/en14040813)

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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.

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