Experimental investigation on drag reduction in a turbulent boundary layer with a submerged synthetic jet |
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Authors: | Biao-Hui Li Kang-Jun Wang Yu-Fei Wang Nan Jiang |
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Institution: | 1.Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;2.Key Laboratory of Modern Engineering Mechanics, Tianjin 300350, China |
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Abstract: | This work investigates the active control of a fully developed turbulent boundary layer by a submerged synthetic jet actuator. The impacts of the control are explored by measuring the streamwise velocities using particle image velocimetry, and reduction of the skin-friction drag is observed in a certain range downstream of the orifice. The coherent structure is defined and extracted using a spatial two-point correlation function, and it is found that the synthetic jet can efficiently reduce the streamwise scale of the coherent structure. Proper orthogonal decomposition analysis reveals that large-scale turbulent kinetic energy is significantly attenuated with the introduction of a synthetic jet. The conditional averaging results show that the induction effect of the prograde vortex on the low-speed fluid in a large-scale fluctuation velocity field is deadened, thereby suppressing the bursting process near the wall. |
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Keywords: | synthetic jet active control turbulent boundary layer drag reduction |
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