„Property “eddy absorb appetite on Sprit
von 
Universität Stuttgart
30.01.2007 - 11:41 - Technology, Science & Research
(prcenter.de) Stuttgart - like much Sprit a flier swallows, depends considerably on the friction resistance, which air eddies at the airplane surface cause. Coworkers of the institute for aerodynamics and gas dynamics (IAG) of the University of Stuttgart developed a procedure, in order to reduce turbulences and thus the resistance effectively. They support themselves thereby by numeric Simulationen on computers of the maximum output computing centre (HLRS) of the university. The scientists expect a lowering of the kerosene consumption of up to 15 per cent.
Alone German Lufthansa spends annually three billion euro on fuel. With the new technology the calculation could fail soon around a three-figure amount of millions smaller. Could world-wide be saved annually with an oil price of 70 dollar per barrel kerosene in the value up to 18 billion euro. In order to reach this, the Stuttgart scientists at the boundary layer set, which develops close at a body, if a fluid (thus a liquid or a gas) rushes over it. In this thin layer the speed of the fluid adapts to the speed of the body. The condition of the boundary layer flow determines friction resistance during the flight, whereby a calm, laminar (laminate-laminating something similar) flow form clearly less resistance causes than a chaotic, turbulent form. A proven method, in order to retard the envelope of the laminar into the turbulent flow form, is sucking the boundary layer off by tiny openings in the airplane surface. With (swept) the wings of today's airplanes bent to the rear this technology is however because of the arising three-dimensional flow effects not surely applicable.
By computer simulations on the supercomputer NEC-SX 8 in the maximum output computing centre of the University of Stuttgart the scientists could develop now a special arrangement of the suction openings, which the effectiveness of the exhaust at swept wings increases drastically. Purposefully „good-like are produced “, longitudinal vortices lying closely next to each other, which suppress harmful eddies and so prevent or retard turbulences.
Also for wind force rotors interesting
„The result is a reduced friction resistance of bearing areas and tail units with smaller sucking off quantity. This leads to an increase at achievement with lower costs “explains Ralf brass and Markus Kloker of the IAG, which let their development announce in the meantime over the technology license office of the universities of Baden-Wuerttemberg to the patent. The method is however not limited on suction apparatuses. Also small depressions, artificial Rauigkeiten or blow-out ports can energize „the good “eddies.
The operational area is not interesting only for the aircraft industry. Also the efficiency of wind force rotors could be substantially increased by the technology. The exhaust would be here simple due to the centrifugal effect of the turning rotors relatively. For the director of the maximum output computing centre, Professor Michael Resch, the new technology is also an example of how the Supercomputing from the research is in-carried into the development. „I count on a radical reducing in price in the next three years, so that virtual reality also for small and medium-size enterprises affordably “, prognosticates Resch.
Further information with Dr. Markus Kloker and Dr. Ralf brass, Institut for aerodynamics and gas dynamics of the University of Stuttgart, Tel. 0711/685 63427, -63422, kloker@iag.uni-stuttgart.de, messing@iag.uni-stuttgart.de.
Contact Informations
Keplerstraße 7 - 70174 Stuttgart
Tel. (0711) 685-82297, -82176, -82122, -82155; Telefax 0711/685-82188 e-mail:presse@uni-stuttgart.de
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