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Volume 8, Number 4, October 2023 , pages 273-293 DOI: https://doi.org/10.12989/acd.2023.8.4.273 |
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A new insight into design of acoustic liner arrays arrangement in the presence of a grazing flow |
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Hadi Dastourani and Iman Bahman-Jahromi
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| Abstract | ||
| This study evaluated the acoustic performance of two configurations of serial HR arrays and lined HR arrays in the presence of grazing flow using a 3D numerical simulation. The dual, triple, and quad HR arrays were compared to the conventional HR array. The simulation results showed that the number of resonant frequencies increased with the number of serial HR arrays. The CTL did not significantly change with the number of serial HR arrays. The acoustic performance of the two, three, and four-lined HR arrays was compared to the conventional HR array. The results showed that the resonant frequency and TLmax increased with the number of lined HR arrays. The CTL also increased with the number of lined HR arrays. The effect of the grazing flow Mach number (Ma) was investigated on the four-lined HR array configuration and compared to the conventional HR configuration. TLmax and CTL decreased for both configurations with increasing Ma. The four-lined HR array configuration had significantly better acoustic performance than the conventional HR configuration. The TLmax and CTL increased by more than 300% when the configuration was changed from the conventional HR to the four-lined HR array at Ma = 0. The increment percentage decreased with increasing Ma. | ||
| Key Words | ||
| acoustic liner design; aeroacoustics; flow noise; Helmholtz resonator; lined HR array | ||
| Address | ||
| Hadi Dastourani and Iman Bahman-Jahromi: Department of Aeronautical Science & Technology, Khayyam Research Institute, 14665-834, Tehran, Iran | ||
