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Slotted hydrofoil design optimization to minimize cavitation in amphibious aircraft application: A numerical simulation approach

  • Received : 2019.04.16
  • Accepted : 2020.04.07
  • Published : 2020.07.25
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Abstract

The proposed study aims to numerically investigate the performance of hydrofoils in the context of amphibious aircraft application. In particular, we also study the effectiveness of a slotted hydrofoil in minimizing the cavitation phenomenon, to improve the overall water take-off performance of an amphibious aircraft. We use the ICON A5 as a base model for this study. First, we propose an approach to estimate the required hydrofoil surface area and to select the most suitable airfoil shape that can minimize cavitation, thus improving the hydrodynamic efficiency. Once the hydrofoil is selected, we perform 2D numerical studies of the hydrodynamic and cavitating characteristics of a non-slotted hydrofoil on ANSYS Fluent. In this work, we also propose to use a slotted hydrofoil to be a passive method to control the cavitation performance through the boundary layer control. Numerical results of several slotted configurations demonstrate notable improvement on the cavitation performance. We then perform a multiobjective optimization with a response surface model to simultaneously minimize the cavitation and maximize the hydrodynamic efficiency of the hydrofoil. The optimization takes the slot geometry, including the slot angle and lengths, as the design variables. In addition, a global sensitivity study has been carried and it shows that the slot widths are the more dominant factors.

Keywords

Acknowledgement

The first author gratefully acknowledges the support of the Department of Mechanical and Aerospace Engineering at the Hong Kong University of Science and Technology (HKUST) for the financial and technical support for the use of the Tianhe-2 supercomputer in the National Supercomputer Center in Guangzhou for the optimization numerical simulations. The second author acknowledges the support from HKUST Start-Up Grant, Project No. R9354.

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  1. Amphibious Aircraft Developments: Computational Studies of Hydrofoil Design for Improvements in Water-Takeoffs vol.8, pp.1, 2020, https://doi.org/10.3390/aerospace8010010