Abstract
Various power augmentation systems have been studied to improve the performance of wind rotors by increasing the energy density of the wind. One of them is the ducted augmentation system. However, most of the studies of the ducted rotor concern the effect of the diffuser [1] [2] while little research has been done concerning the concentrator (nozzle). This paper analyses the effect of the concentrator and its optimum design. The effect of power augmentation is increased if (a) the position of the rotor is correctly behind the outlet of the concentrator, (b) the outlet diameter of the concentrator is smaller than the rotor diameter, and © the inlet diameter is much larger than the rotor diameter.
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References
1.
Foreman
K.M.
Gilbert
B.L.
Oman
R.A.
(1978 ) “Diffuser augmentation of wind turbines” , Solar Energy , Vol. 20 , pp. 305 –311 .
2.
Politis
G.K.
Koras
A.D.
(1995 ) “A performance prediction method for ducted medium loaded horizontal axis wind turbines” , Wind Engineering , Vol. 19 , No. 5 , pp. 273 –288 .