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Development of multi-cycle rainbow particle tracking velocimetry improved by particle defocusing technique and an example of its application on twisted Savonius turbine

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Abstract

Rainbow particle tracking velocimetry (PTV) is a PTV method that enables three-dimensional (3D) three-component flow measurement using a single camera. Despite the advantage of its simple setup, the accuracy of the particle depth is restricted due to false color caused by image sensor arrays, such as Bayer arrangement. Since the false color occurs near sharp edges in the color gradient of in-focus individual particle images, we here introduced a defocusing technique to rainbow PTV to remove these false colors. Defocusing led to moon-shaped distorted particle images, which we applied an adaptive mask correlation technique to detect. Multi-cycle rainbow illumination was realized as an additional improvement on the defocusing technique. In particular, individual particle coordinates were obtained by a combination of the color and constitution of pixels. This dramatically increased the depth resolution of the 3D particle tracking. The feasibility of the proposed method was demonstrated by a flow driven by rotating impellers and a wake behind a twisted Savonius turbine. By the demonstration, it is confirmed that the twisted turbine suppresses the loss of kinetic energy by shedding streamwise vortices in the wake.

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Acknowledgements

This work was supported by research funding from Hokkaido Gas Co., Ltd.

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Authors and Affiliations

  1. Laboratory for Flow Control, Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo, 060-8628, Japan

    Hyun Jin Park, Shunta Yamagishi, Susumu Osuka, Yuji Tasaka & Yuichi Murai

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  1. Hyun Jin Park
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  2. Shunta Yamagishi
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  3. Susumu Osuka
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  4. Yuji Tasaka
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  5. Yuichi Murai
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Correspondence to Hyun Jin Park.

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Park, H.J., Yamagishi, S., Osuka, S. et al. Development of multi-cycle rainbow particle tracking velocimetry improved by particle defocusing technique and an example of its application on twisted Savonius turbine. Exp Fluids 62, 71 (2021). https://doi.org/10.1007/s00348-021-03179-7

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  • DOI: https://doi.org/10.1007/s00348-021-03179-7

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