| Citation: | KONG Bo, WANG Changsheng, DING Wenhao, et al. Flow visualization experiment of jet mixing enhancement using pulsed jets[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(5): 994-1003. doi: 10.13700/j.bh.1001-5965.2020.0105(in Chinese)
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In this paper, a turbulent jet with Reynolds number 33 000 forced by a pair of pulsed jets working in antisymmetric mode is investigated using laser-induced fluorescence technique. The evolution of large-scale vortex structures in the shear layer is captured and the effect of forcing frequency and amplitude of pulsed jets on vortex structure and mixing enhancement is studied. It is found that inclined and staggered vortex structures are generated in the shear layer, causing the oscillation of primary jet and promoting entrainment. The forcing frequency mainly influences the distance of neighboring vortex rings. There exists optimal excitation frequency that causes the primary jet bifurcating in the far field and spreading most in the shear layer in the forced plane. The forcing amplitude also has effect on the vortex structure. The vortex structures are larger and more coherent at high amplitude, resulting in better mixing enhancement.
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