Abstract
This work aims to manipulate a fully developed turbulent boundary layer over a flat plate based on plasma-induced streamwise vortices, with a view to reducing the friction drag. Four different plasma actuator configurations for generating streamwise vortices were explored. A surface balance technique is deployed to measure the skin-friction drag. A new calibration method is proposed for this technique to resolve accurately the friction drag change. It is found that the plasma-actuator-generated vortices and their interactions with the boundary layer may lead to a substantial drag reduction. The control efficiency is also estimated. A single hotwire is used to measure the streamwise velocity fluctuation u in the turbulent boundary layer, while flow visualization is performed in the buffer layer, which reveals that the low-speed streaks are pushed by the plasma force toward the centre of the actuator pair, forming a barrier that interferes the turbulence production cycle, and hence allowing substantial drag reduction.
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References
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Acknowledgments
CW WONG wishes to acknowledge support given to him from Research Grants Council of Shenzhen Government through grants JCYJ20120613153244545, JCYJ20120613144508935 and JCYJ20130402100505796.
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© 2016 Springer-Verlag Berlin Heidelberg
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Wong, C.W., Zhou, Y., Li, Y.Z., Zhang, B.F. (2016). Skin Friction Drag Reduction Based on Plasma-Induced Streamwise Vortices. In: Zhou, Y., Lucey, A., Liu, Y., Huang, L. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48868-3_22
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DOI: https://doi.org/10.1007/978-3-662-48868-3_22
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