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<p>The ventilation duct is a critical component for transmitting airflow, and its curvature and internal components may induce aerodynamic noise. To clarify the aerodynamic noise characteristics and noise source contributions of each component in the ventilation duct, a small wind tunnel is designed for experimental studies. First, the performance of the test platform is evaluated and then calibrated using publicly available benchmark data. Subsequently, in terms of an empty curved duct and a curved duct with an embedded plate, parametric studies are conducted under different velocities and plate angles, respectively. Noise source contributions are identified, frequency–response characteristics are analyzed, and influences of various parameters on the acoustic properties are then summarized. The results indicate that the primary noise sources in all conditions are the plate; sound energy is primarily concentrated in the low-frequency range, with a single-frequency peak at 1560&#xa0;Hz caused by the well-known Parker mode. Changes in velocities and plate angles mainly affect the sound pressure levels at various frequencies but have little impact on the noise characteristics. These research results provide a useful basis for the development of noise reduction solutions in the future.</p>

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Design and Performance of a Small Acoustic Wind Tunnel for Aeroacoustic Studies on Ventilation Ducts

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Yi Fang,
  • Jieyan Chen,
  • Jiawei Meng,
  • Baicheng Li,
  • Yongji Zhao,
  • Yaxuan Sun

摘要

The ventilation duct is a critical component for transmitting airflow, and its curvature and internal components may induce aerodynamic noise. To clarify the aerodynamic noise characteristics and noise source contributions of each component in the ventilation duct, a small wind tunnel is designed for experimental studies. First, the performance of the test platform is evaluated and then calibrated using publicly available benchmark data. Subsequently, in terms of an empty curved duct and a curved duct with an embedded plate, parametric studies are conducted under different velocities and plate angles, respectively. Noise source contributions are identified, frequency–response characteristics are analyzed, and influences of various parameters on the acoustic properties are then summarized. The results indicate that the primary noise sources in all conditions are the plate; sound energy is primarily concentrated in the low-frequency range, with a single-frequency peak at 1560 Hz caused by the well-known Parker mode. Changes in velocities and plate angles mainly affect the sound pressure levels at various frequencies but have little impact on the noise characteristics. These research results provide a useful basis for the development of noise reduction solutions in the future.