Aeroacoustic Characteristics of a Strut-braced High-lift Device

The aerodynamic and aeroacoustic performance of a strut-based high-lift device were 5 evaluated and demonstrated for six different strut models. The primary objective of the study 6 was to investigate the impact of strut modifications on reducing noise levels. The aerodynamic 7 characteristics are presented with the aid of surface pressure distribution on the airfoil that 8 remained consistent across all the tested configurations. The aeroacoustic results are presented 9 as the near-field surface pressure fluctuations and far-field noise measurements to attain a 10 profound comprehension of the noise generation mechanism. Although the Albatros strut 11 exhibited the greatest reduction in tonal noise, the directivity pattern and the overall sound 12 pressure level of the radiated noise demonstrated that the medium height strut configuration can 13 achieve noise reduction of up to 8 dB. The near-field unsteady surface pressure measurements 14 are suggestive of harmonic oscillations. The coherence studies carried out have shown a 15 decrease in the tonal coherence for the small height strut configuration while the velocity field 16 measurements performed in the wake of the high-lift device show no significant variation in 17 flow patterns between different strut configurations