Controlling Dynamic Stall with an Electrically Actuated Flexible Wall
 |
|
Описание:
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 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. 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. The pressures were measured along the central chord axis using a pressure scanner. The pressures showed a 2° delay in dynamic stall at certain frequencies of excitation. Drastic changes in pressure around the point of zero pressure gradient were found. The excitation was...Похожие книги
 | Distribution, Redistribution, Output, Employment, Prices and Expenditure Автор: L. Athanassiou Год: 2001 |
 | Managing Outside Pressure: Strategies for Preventing Corporate Disasters Автор: Matthias Winter, Ulrich Steger Год: 2001 |
 | Domestic Budgets in a United Europe: Fiscal Governance from the End of Bretton Woods to Emu Автор: Mark Hallerberg Год: 2004 |
 | Trust in Numbers Автор: Theodore M. Porter Год: 1995 |
 | Trust in Numbers Автор: Theodore M. Porter Год: 1995 |
 | Infanticide by Males and its Implications Автор: Carel P. van Schaik, Charles H. Janson Год: 2000 |