Proportional feedback control of laminar flow over a hemisphere
| Autor: | Jungil Lee, Donggun Son |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Mechanical Engineering Feedback control Proportional control Laminar flow Mechanics Wake Vortex shedding 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Lift (force) Transverse velocity Mechanics of Materials Control theory 0103 physical sciences Time derivative 010306 general physics |
| Zdroj: | Journal of Mechanical Science and Technology. 30:3667-3672 |
| ISSN: | 1976-3824 1738-494X |
| DOI: | 10.1007/s12206-016-0728-y |
| Popis: | In the present study, we perform a proportional feedback control of laminar flow over a hemisphere at Re = 300 to reduce its lift fluctuations by attenuating the strength of the vortex shedding. As a control input, blowing/suction is distributed on the surface of hemisphere before the separation, and its strength is linearly proportional to the transverse velocity at a sensing location in the centerline of the wake. The sensing location is determined based on a correlation function between the lift force and the time derivative of sensing velocity. The optimal proportional gains for the proportional control are obtained for the sensing locations considered. The present control successfully attenuates the velocity fluctuations at the sensing location and three dimensional vortical structures in the wake, resulting in the reduction of lift fluctuations of hemisphere. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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