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Self-sustained oscillation of the flow in a double-cavity channel: a time-resolved PIV measurement

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Abstract

This study investigates self-sustained oscillation of the flow in a double-cavity channel with cavity length–width ratio L/H = 3 using a time-resolved particle image velocimetry (TR-PIV) technique. Three Reynolds numbers based on the cavity length L and the bulk velocity in the narrow section of the channel \(U_{0}\), i.e., \(Re_{L}\) = 12,500, 24,580, and 49,100, are considered to investigate the influence of Reynolds number on the self-sustained oscillation. As the Reynolds number increases, the oscillation becomes more intense and shifts to the leading edge of the double-cavity channel. However, the power spectra and contour plots of the spatial v–v correlation coefficient reveal that the periodicity of the oscillation becomes less profound as the Reynolds number increases. A further phase-averaged analysis reveals the spatiotemporal evolution process of oscillation and convincingly demonstrates a more intense and complicated process of the oscillation as the Reynolds number increases.

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Authors and Affiliations

  1. Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Hao Fu, Chuangxin He & Yingzheng Liu

  2. Gas Turbine Research Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Hao Fu, Chuangxin He & Yingzheng Liu

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  1. Hao Fu
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  2. Chuangxin He
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  3. Yingzheng Liu
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Correspondence to Chuangxin He.

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Fu, H., He, C. & Liu, Y. Self-sustained oscillation of the flow in a double-cavity channel: a time-resolved PIV measurement. J Vis 23, 245–257 (2020). https://doi.org/10.1007/s12650-020-00626-1

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  • DOI: https://doi.org/10.1007/s12650-020-00626-1

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