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Ducted Wind Turbines
Published in Vaughn Nelson, Innovative Wind Turbines, 2019
The Wind LensWind Lens (Figure 3.4) is a modification of the wind turbine technology developed by Professor Yuji OhyaOhya|Yuji at the wind energy engineering section at Kyushu UniversityKyushu University's Research Institute for Applied Mechanics (RIAM, https://www.riam.kyushu-u.ac.jp/windeng/en_index.html) in Japan [2]. A brim on the shroud produces vortices that create a low-pressure region behind the turbine, which helps more wind to flow through the Wind Lens. Two mid-size (100 kW at 12 m/s) Wind Lens turbines were constructed at the Ito campus of Kyushu University (2011). The rotor diameter was 12.8 m, diffuser diameter was 15.4 m, and the whole structure was 34 m high. The technology was also tested on a hexagonal floating platform, 18 m in diameter, in Hakata Bay, Fukuoka Japan starting in 2012. The renewable energy farm experiment had two Wind Lens turbines (3 kW each) and photovoltaic (PV) panels (2 kW).
Shrouded wind turbines: a critical review on research and development
Published in International Journal of Ambient Energy, 2022
Mohammad Hadi Katooli, Younes Noorollahi
Optimal shape for a brimmed diffuser, like the height of the brim, the angle of the brim, inlet shape of the shroud, etc. was studied experimentally by Ohya et al. (2006). The results show that wind speed and power are increased by a factor of about 5 times more than a bare wind turbine. Fletcher et al. (2007) have used a novel diffuser and a contractor for a wind turbine. Ohya et al. (2008) have optimised wind turbine performance by introducing wind-lens technology. Wind-lens technology consists of the brim, diffuser and an inlet Shroud. The flange produces a low-pressure section at the back of the wind turbine by forming a vortex. The optimal geometry of the flanged diffuser is examined. Figure 10 shows a real prototype of a wind turbine. The diameter of the rotor is 0.7 m. Figure 11 shows the schematic view of a different part of a shrouded wind turbine. This figure shows the ratio of is usually more than 1.