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Effects of Synthetic jets on a D-Shaped Cylinder wake at a Subcritical Reynolds Number

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Abstract

Effects of synthetic jets on the wake of a D-shaped cylinder is investigated experimentally at a Reynolds number Re H = 47,000, based on incoming free-stream velocity and the cylinder height (H). The synthetic jets are introduced immediately from the upper and lower trailing edges of the cylinder. The upper and lower synthetic jets are operated in an in-phase or anti-phase mode, and at a momentum ratio C μ = 1.0% and perturbation frequency St A = 0.11 −0.37. The cylinder wake with perturbation is examined in detail and compared with that without, based on smoke-wire flow visualization, pressure transducer and hotwire rake measurements, and data analyses of spectra, tempo-spatial cross-correlation and proper orthogonal decomposition (POD). Large-scale vortical structures in the cylinder wake are significantly modified by the synthetic jets perturbations, exhibiting symmetric or asymmetric patterns, depending on the perturbation frequency and phase relationship of the synthetic jets. These observations are internally correlated with the drag force variations.

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Author notes

  1. H. L. Bai

    Present address: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

Authors and Affiliations

  1. School of Aeronautics and Astronautics, Dalian University of Technology, Dalian, 116024, China

    N. Gao, Y. Q. Li & C. J. Wu

  2. State Key Laboratory of Aerodynamics, Mianyang, 621000, China

    H. L. Bai

  3. Department of Mechanical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia

    H. L. Bai

Authors
  1. N. Gao
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  2. Y. Q. Li
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  3. H. L. Bai
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  4. C. J. Wu
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Correspondence to H. L. Bai.

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Gao, N., Li, Y.Q., Bai, H.L. et al. Effects of Synthetic jets on a D-Shaped Cylinder wake at a Subcritical Reynolds Number. Flow Turbulence Combust 97, 729–742 (2016). https://doi.org/10.1007/s10494-016-9712-y

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  • DOI: https://doi.org/10.1007/s10494-016-9712-y

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