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• W2474289388 abstract "A numerical computation for flow past an airfoil with local oscillation is presented at low Reynolds numbers to study the effect of local oscillation on the aerodynamic performance of the airfoil. The model for local oscillation is simplified as a periodic motion with prescribed equilibrium. Coupled with unsteady low-Reynolds-number flow, the effects of the oscillation on lift enhancement are studied parametrically. In particular, the formation and evolution of flow separation and vortices with different oscillation frequencies are discussed to determine an effective flow control strategy. The results show that there are two kinds of flow pattern related to lift enhancement. One is that as the primary frequency of flow approaches the oscillating frequency and the secondary frequency of the flow attains a rate twice that of the first one, i.e., frequency lock-in occurs, the vortices evolve close to the leading edge and convect downstream toward the surface. These vortices entrain the energy of the main stream into the separation zone to overcome the limitation of the dead air zone and maintain a low pressure distribution on the upper surface, which will have a significant impact on lift improvement. In the other pattern, as the higher frequency goes out of the lock-in range, the vortices evolve downstream of the surface, which has a limited impact on fluid transport from the main stream to the separation zone, and the effect of lift enhancement is negligible." @default.
• W2474289388 created "2016-07-22" @default.
• W2474289388 creator A5016882619 @default.
• W2474289388 creator A5019346237 @default.
• W2474289388 date "2016-01-01" @default.
• W2474289388 modified "2023-09-27" @default.
• W2474289388 title "Lock-In Behaviors of an Airfoil with Local Excitation in Low-Reynolds-Number Flow" @default.
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• W2474289388 doi "https://doi.org/10.1007/978-3-319-28764-5_4" @default.
• W2474289388 hasPublicationYear "2016" @default.
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