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Numerical investigation of frictional drag reduction with an air layer concept on the hull of a ship

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Abstract

A novel air bubble lubrication method using the winged air induction pipe (WAIP) device is used to reduce the frictional drag of the hull of the ship and hence increase the efficiency of the propulsion system. This bubble lubrication technique utilizes the negative pressure region above the upper surface of the hydrofoil as the ship moves forward to drive air to the skin of the hull. In the present study, the reduction rate of the drag by applying the WAIP device is numerically investigated with the open source toolbox OpenFOAM. The generated air layer and the bubbles are observed. The numerical results indicate that the reduction rate of the drag closely depends on the depth of the submergence of the hydrofoil, the angle of attack of the hydrofoil, and the pressure in the air inlet. It is also proportional to the air flow rate. The underlying physics of the fluid dynamics is explored.

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Authors and Affiliations

  1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Jun Zhang & Shuo Yang

  2. Energy Research Institute @NTU, Nanyang Technological University, Singapore, Singapore

    Jing Liu

Authors
  1. Jun Zhang
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  2. Shuo Yang
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  3. Jing Liu
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Corresponding author

Correspondence to Jing Liu.

Additional information

Biography: Jun Zhang (1978-), Male, Ph. D.

Project supported by the National Natural Science Youth Foundation of China (Grant No. 11902125).

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Zhang, J., Yang, S. & Liu, J. Numerical investigation of frictional drag reduction with an air layer concept on the hull of a ship. J Hydrodyn 32, 591–604 (2020). https://doi.org/10.1007/s42241-019-0063-8

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  • DOI: https://doi.org/10.1007/s42241-019-0063-8

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