期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 66, 期 -, 页码 83-94出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2017.05.013
关键词
Plasma actuators; Direct numerical simulation; Skin-friction drag reduction; Turbulence
资金
- EPSRC [EP/M022676/1]
- Engineering and Physical Sciences Research Council [EP/M022676/1] Funding Source: researchfish
- EPSRC [EP/L000261/1, EP/M022676/1] Funding Source: UKRI
Direct Numerical Simulations in a turbulent channel flow at a moderate Reynolds number are performed in order to investigate the potential of Dielectric Barrier Discharge (DBD) plasma actuators for the reduction of the skin-friction drag. The idea is to use a sparse array of streamwise-aligned plasma actuators to produce near-wall spanwise-orientated jets in order to destroy the events which transport highspeed fluid towards the wall. It is shown that it is possible to reduce the drag by about 33.5% when the streamwise-aligned actuators are configured to generate appropriate spanwise-orientated jets very close to the wall so that the sweeps which are mainly responsible for the skin-friction are destroyed. We demonstrate that it is possible to achieve significant drag reduction with a sparse array of streamwise-aligned plasma actuators, with one order of magnitude less actuators than previous experiments in a similar set-up. (C) 2017 The Authors. Published by Elsevier Inc.
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