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Bio-inspired trailing-edge serrations on fan blades significantly reduce noise pollution by up to 5 decibels. This passive strategy enhances aerodynamic stability without compromising efficiency, offering a promising solution for quieter mechanical ventilation systems.

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Area of Science:

  • Acoustics and Fluid Dynamics
  • Bio-inspired Engineering
  • Environmental Science

Background:

  • Urban noise pollution from mechanical ventilation systems is a growing environmental concern.
  • Fan noise, a major contributor, includes disruptive tonal and broadband components.
  • Current noise reduction strategies often face limitations.

Purpose of the Study:

  • To investigate trailing-edge serrations as a passive noise-reduction method for fan blades, inspired by owl flight.
  • To analyze the impact of serration geometry on acoustic performance and aerodynamics.
  • To develop a framework for designing low-noise fan systems.

Main Methods:

  • Hybrid numerical approach coupling Large Eddy Simulations (LES) with acoustic analogy models.
  • Sensitivity analysis of serration parameters (number, sawtooth ratio).
  • Experimental validation across varying rotational speeds.

Main Results:

  • Trailing-edge serrations achieved noise reductions of up to 5 decibels.
  • Aerodynamic efficiency, thrust, and drag remained largely unaffected.
  • Serrations improved spanwise flow coherence and turbulence stabilization.

Conclusions:

  • Bio-inspired serrations offer an effective passive noise control strategy for fans.
  • Geometric parameter optimization is key to maximizing noise reduction.
  • This approach provides a foundation for developing quieter ventilation systems.