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Controlling Dynamic Stall with an Electrically Actuated Flexible Wall. The mysterious zero pressure gradient point on the suction side of a pitching airfoil

Автор:   Niranjan M.
мягкая обложка
140 страниц
2010 год
Издательство:   Книга по Требованию
2413 руб
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Описание:Drastic changes in pressure around the point of zero pressure gradient were found. The amplitudes of vibrations of the membrane were measured to be about 0. 01 microns. The power consumption was 1W. The experiments were carried out in a low speed wind tunnel at a Reynolds number about 6 E 05 and Mach no. of 0. 1. A four bar mechanism was used for sinusoidal pitching of the airfoil. An investigation has been made on the control of unsteady separating boundary layers, and the resulting dynamic stalls over a pitching NACA 0012 airfoil model using a Flexible Wall Transducer mounted on the leading edge. The pressures were measured along the central chord axis using a pressure scanner. The excitation was effective over a narrow zone around this point. The pressures showed a 2° delay in dynamic stall at certain frequencies of excitation. A case of extra-ordinary lift over an initially pitching but subsequently static airfoil has also been reported. The transducer consisted of an aluminized Mylar membrane stretched across an array of strip shaped electrodes. An AC excitation was given to two adjacent strips covering 1. 5 mm in stream wise direction.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

2990 руб
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Might Is Right

Strong-Men are magnetized incarnations of primordial energy — dynamos of concentrated electricity. There is a mysterious, almost magical charm about the personality of True Greatness. Lesser men are attracted to their Natural Chiefs as steel shavings are drawn to the loadstone. This peculiar attractive force is hardly ever seen (except spasmodically) in physical weaklings. It seems to develop only in animals of unusual vitality — men with plenty of “devil” in them. Physical power is the basis of mental power. The nutriment of the brain cells is derived from the blood-corpuscles perpetually being pumped into it by the heart’s action. If the pump valves are weak or out of gear — if the food stream is impure — if the stomach if disordered — if the liver is congested or the lungs decaying and corrupt; then the brain is starved, drugged, poisoned, while all the thoughts that germinate therein are feeble, unnatural, impure. Hence the rolling stream of literary filth that the Zolas and the bible-boomers, the poetlings, and the ‘eminent savants,’ keep pouring out upon generations of men, soaked for ages in similar intellectual sewerage ...»

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