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Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct

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Abstract

We investigate turbulent flow with highly pulsating axial velocity passing through a duct with both first and second bends. The time-dependent velocity fields downstream of the bends were measured using time-resolved stereo particle image velocimetry for the steady case (Reynolds number Re = 36,700) and the pulsatile case (Re = 37,800 and Womersley number α = 59.1). Proper orthogonal decomposition (POD) of the in-plane velocity data isolates the energetic structures of the secondary flow. The modes downstream of the first bend have a Dean motion (mode 0), single swirl (mode 1), and double swirl (mode 2), which agree with those of previous studies on steady turbulent flow. Downstream of the second bend, additional vortices appear in the modes owing to the secondary flow originating in the first bend. The modal structure of the pulsatile case is virtually the same as that of the steady case. To our knowledge, we are the first to find swirl switching in pulsatile flow, whereas the switching has been reported only for steady cases. We further conduct a time-frequency analysis via wavelet transformation onto the POD time coefficient, showing intermittency in energy of the mode associated with swirl switching.

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Acknowledgments

This work was partially supported by a research grant from The Hiroshima University Education and Research Support Foundation. Mark Kurban, M. Sc., from Edanz Group (www.edanzediting.com/ac) edited a draft of this manuscript.

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Authors and Affiliations

  1. Department of Mechanical Systems Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima, 739-8527, Japan

    Junichi Oki, Yukika Kuga, Keiya Nishida & Yoichi Ogata

  2. Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima, 730-8670, Japan

    Ryo Yamamoto, Kazuhiro Nakamura & Hideaki Yokohata

Authors
  1. Junichi Oki
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  2. Yukika Kuga
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  3. Ryo Yamamoto
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  4. Kazuhiro Nakamura
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  5. Hideaki Yokohata
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  6. Keiya Nishida
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  7. Yoichi Ogata
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Correspondence to Yoichi Ogata.

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Oki, J., Kuga, Y., Yamamoto, R. et al. Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct. Flow Turbulence Combust 104, 817–833 (2020). https://doi.org/10.1007/s10494-019-00088-y

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  • DOI: https://doi.org/10.1007/s10494-019-00088-y

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