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Active control of an axisymmetric jet with distributed electromagnetic flap actuators

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Abstract

Miniature electromagnetic flap actuators are developed and mounted on the periphery of the nozzle exit of an axisymmetric jet to induce various flow modes and enhance mixing processes. It is demonstrated that the flap actuators can significantly modify the large-scale vortical structures. In particular, when the flaps are driven in anti-phase on either side of the jet, alternately inclined and bent vortex rings are generated, and the jet bifurcates into two branches. Since the vortex rings are formed at the very vicinity of the nozzle exit, the bifurcation is accomplished as close as x/D=3.

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Acknowledgements

The authors gratefully acknowledge Professors H. Miura and I. Shimoyama for their guidance in developing the actuators. We would like to thank Mr. N. Kurimoto for his help in the flap characterization. This work was supported through the Grant-in-Aid for Scientific Research (No. 10355010) by the Ministry of Education, Culture, Sports, Science, and Technology.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-8656, Tokyo , Japan

    H. Suzuki, N. Kasagi & Y. Suzuki

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  1. H. Suzuki
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  2. N. Kasagi
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  3. Y. Suzuki
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Correspondence to N. Kasagi.

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Suzuki, H., Kasagi, N. & Suzuki, Y. Active control of an axisymmetric jet with distributed electromagnetic flap actuators. Exp Fluids 36, 498–509 (2004). https://doi.org/10.1007/s00348-003-0756-0

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