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<p>Noise pollution caused by eVTOL remains a main concern for its operation. Development of low-noise technology in eVTOL has been demanded for gaining public acceptance since it is primarily operated on densely populated areas. As a low-noise technology, novel propeller design featuring a toroidal-shaped blade has been introduced. In the present study, the aero-acoustic performance of a single bi-loop toroidal propeller was evaluated using CFD. Simulations were conducted by varying the total diameter from 183 to 240 mm and the root blade angle from 15 to 40°. The resulting thrust, power, and sound power levels were compared across multiple simulation cases. Increasing diameter and blade angle results in higher thrust and power, but thrust decreases as blade angle changes from 34 and 40°. Sound power from the quadrupole noise source increases with diameter and blade angle, while sound power from the dipole source does not show distinct pattern with blade anlge.</p>

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Parametric study of toroidal propellers for development of low-noise design technology using CFD

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Juwook Lee,
  • Jongrak Choi

摘要

Noise pollution caused by eVTOL remains a main concern for its operation. Development of low-noise technology in eVTOL has been demanded for gaining public acceptance since it is primarily operated on densely populated areas. As a low-noise technology, novel propeller design featuring a toroidal-shaped blade has been introduced. In the present study, the aero-acoustic performance of a single bi-loop toroidal propeller was evaluated using CFD. Simulations were conducted by varying the total diameter from 183 to 240 mm and the root blade angle from 15 to 40°. The resulting thrust, power, and sound power levels were compared across multiple simulation cases. Increasing diameter and blade angle results in higher thrust and power, but thrust decreases as blade angle changes from 34 and 40°. Sound power from the quadrupole noise source increases with diameter and blade angle, while sound power from the dipole source does not show distinct pattern with blade anlge.