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An experimental study on a suction flow control method to reduce the unsteadiness of the wind loads acting on a circular cylinder

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Abstract

An experimental investigation was conducted to assess the effectiveness of a suction flow control method for vortex-induced vibration (VIV) suppression. The flow control method uses a limited number of isolated suction holes to manipulate the vortex shedding in the wake behind a circular cylinder in order to reduce the unsteadiness of the dynamic wind loads acting on the cylinder. The experimental study was performed at Re ≈ 3.0 × 104, i.e., in the typical Reynolds number range of VIV for the cables of cable-stayed bridges. In addition to measuring the surface pressure distributions to determine the resultant dynamic wind loads acting on the test model, a digital particle image velocimetry system was used to conduct detailed flow field measurements to reveal the changes in the shedding process of the unsteady wake vortex structures from the test model with and without the suction flow control. The effects of important controlling parameters (i.e., the azimuthal locations of the suction holes in respect to the oncoming airflow, the spanwise spacing between the suction holes, and the suction flow rate through the suction holes) on the wake flow characteristics, the surface pressure distributions, and the resultant dynamic wind loads were assessed quantitatively. While a higher suction flow rate and smaller spanwise spacing between the suction holes were beneficial to the effectiveness of the suction flow control, the azimuthal locations of the suction holes were found to be very critical for reducing the fluctuating amplitudes of the dynamic wind loads acting on the test model using the suction flow control method. With the suction holes located at the proper azimuthal locations on the test model (i.e., at the azimuthal angle of θ = 90° and 270° for the present study), the characteristics of the wake flow behind the test model were found to change significantly along the entire span of the test model, even though only a limited number of the isolated suction holes were used for the suction flow control. The detailed flow field measurements were correlated with the measured surface pressure distributions and the resultant dynamic wind loads acting on the test model to gain further insight into the fundamental mechanism of the suction flow control method for VIV suppression.

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Acknowledgments

This research work was funded partially by National Science Foundation (NSF) under award number of OSIE-1064235 and Natural Sciences Foundation of China (NSFC) (51378153, 51008093, 51161120359, 91215302, and 51008103). The authors want to thank Bill Richard and Kai Zhang of Iowa State University for their help in conducting for the present study.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Iowa State University, Ames, IA, 50011, USA

    Wen-Li Chen & Hui Hu

  2. Key Lab of structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin, 150090, Heilongjiang, People’s Republic of China

    Wen-Li Chen & Hui Li

  3. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, Heilongjiang, People’s Republic of China

    Wen-Li Chen & Hui Li

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  1. Wen-Li Chen
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Correspondence to Hui Hu.

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Chen, WL., Li, H. & Hu, H. An experimental study on a suction flow control method to reduce the unsteadiness of the wind loads acting on a circular cylinder. Exp Fluids 55, 1707 (2014). https://doi.org/10.1007/s00348-014-1707-7

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  • DOI: https://doi.org/10.1007/s00348-014-1707-7

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