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<p>Propellers play a pivotal role in ships' propulsion system by enabling it to move through water. The Sharrow propeller represents an innovative idea in marine propulsion technology because of its capability to increase efficiency and decrease fuel consumption. Its unique design causes a significant decrease in drag while increasing thrust. Given its impact on marine energy consumption, the optimal design calls for minimizing energy losses and entropy generation and maximizing overall efficiency, making it a critical avenue for research and development in sustainable maritime operations. This study aims to optimize the horizontal spacing between the cylinder and the NACA0012 airfoil employing a multi-objective genetic algorithm and entropy generation analysis. The optimization is conducted at various angles of attack and different spacing. Moreover, the study investigates the impact of the spacing between the cylinder and airfoil on entropy generation rate due to viscous and turbulence losses, volumetric entropy, and aerodynamic efficiency. The results indicate that at the optimal spacing, aerodynamic efficiency increases by 14.59%, 17.39%, 30.414%, 20.62%, and 19.14% at angles of 0°, 5°, 10°, 15°, and 20°, respectively. In addition, at the optimal distance, the rate of volumetric entropy generation decreases by 13.73%, 15.95%, 23.43%, 18.18%, and 30% at angles of 0°, 5°, 10°, 15°, and 20°, respectively.</p>

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Optimization of horizontal spacing in cylinder-NACA0012 airfoil configuration in the Sharrow propeller using entropy generation analysis and multi-objective genetic algorithm

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Reza Abbaspour,
  • Mitra Yadegari,
  • Abdolamir Bak Khoshnevis,
  • Davood Hoseinzade

摘要

Propellers play a pivotal role in ships' propulsion system by enabling it to move through water. The Sharrow propeller represents an innovative idea in marine propulsion technology because of its capability to increase efficiency and decrease fuel consumption. Its unique design causes a significant decrease in drag while increasing thrust. Given its impact on marine energy consumption, the optimal design calls for minimizing energy losses and entropy generation and maximizing overall efficiency, making it a critical avenue for research and development in sustainable maritime operations. This study aims to optimize the horizontal spacing between the cylinder and the NACA0012 airfoil employing a multi-objective genetic algorithm and entropy generation analysis. The optimization is conducted at various angles of attack and different spacing. Moreover, the study investigates the impact of the spacing between the cylinder and airfoil on entropy generation rate due to viscous and turbulence losses, volumetric entropy, and aerodynamic efficiency. The results indicate that at the optimal spacing, aerodynamic efficiency increases by 14.59%, 17.39%, 30.414%, 20.62%, and 19.14% at angles of 0°, 5°, 10°, 15°, and 20°, respectively. In addition, at the optimal distance, the rate of volumetric entropy generation decreases by 13.73%, 15.95%, 23.43%, 18.18%, and 30% at angles of 0°, 5°, 10°, 15°, and 20°, respectively.