By Peter Auer (Auth.)
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Extra info for Advances in Energy Systems and Technology. Volume 1
The principle of operation is to increase the mass of air flowing through the turbine, compared to that of a conventional turbine, by recovering the exhaust kinetic energy with a diffuser and producing a much lower pressure immediately downstream of the turbine. ) Two methods have been suggested for obtaining such short, large-angle diffuser s of high performance, those of boundary layer control and ring- Wind Power 33 wing shroud sections. The former uses the relatively high-energy external air to energize the diffuser boundary layer through tangential slots, the shroud being divided into several segments, as shown in Fig.
Only accumulated experience will prove the accuracy of such methods, but to accomplish the widespread use of wind power necessitates some short cuts in site selection. The single most useful variable is the average wind speed. 2 mph), a range which just brackets the "gentle breeze" classification on the Beaufort scale! This is not to deny the fact that there are many sites having greater speeds, but these have to be searched for. They are usually found on or near coastlines and in high or mountainous terrain.
The project envisaged a number of ducts clustered around a central duct at the top of a hill, each duct facing directly into the wind from a given quarter, with the air passing through a turbine whose discharge was a duct of increasing area acting similarly to the draft tube of a hydraulic turbine. A feature of present-day prominence is that of pumped storage using power from the wind turbine to raise water from a low-level reservoir to a higher one when excess power is generated, and making hydropower available in times of wind shortage.