Controlled Aerodynamic Instability Phenomena
The wind interacts with the obstacles it reaches in its way by transferring a part of its energy to those interactions, which are converted into forces over the bodies, leading them to different levels of motion, which are directly dependent on their aeroelastic and geometric characteristics. A large amount of studies and researches has been conducted concerning these interactions and their dependencies, aiming the understanding of the aerodynamic phenomena that arise due to them, such as the Kármán vortex street, galloping, buffeting and flutter, mainly regarding bluff bodies. By the understanding of such phenomena it is possible to predict instabilities and their consequent motions, feeding the designers with the data they need in order to arrange the structures properly.
In the great majority of the cases – e.g.: in civil buildings – such motions are useless and undesirable, in a manner that all the designing approaches are focused on avoiding them. However these instabilities may also be used in a profitable manner: if they are controlled and driven to a predictable motion, they can provide mechanical power supply to run, for example, turbines, machinery and electricity generators.
So, by using the knowledge acquired by now regarding those aerodynamic instabilities and by developing new features, it is possible to propose ways to stimulate them to an optimal state, using them for power generation purposes. That way, alternative approaches to the windmill may be proposed and developed. Farthing Econologica applies the practical requirements for a windmill to greatly whittle down the possibilities.
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