期刊
INTERNATIONAL JOURNAL OF AEROACOUSTICS
卷 22, 期 1-2, 页码 23-40出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/1475472X221150175
关键词
Helmholtz resonator; transmission loss; noise attenuation; aeroacoustics; grazing flow
This study investigated the influence of neck length, cavity volume, and flow Mach number on the noise attenuation performance of a dual Helmholtz resonators (HR) system. The results showed that the second neck length affected the second resonance frequency and maximum transmission loss (TL). Changing the cavity volume had a significant impact on noise attenuation ability at lower flow rates. The flow Mach number had a more pronounced effect on the first TL peak than the second TL peak. This study provides guidance in designing suitable dual HRs for aero-engine systems.
Helmholtz resonators (HR) are widely used in aero-engine systems for noise reduction. By connecting a pair of HRs in series (neck-cavity-neck-cavity), a dual HRs system is formed. This study investigated the influence of neck length, cavity volume and flow Mach number on the noise attenuation performance of a dual HRs system. A three-dimensional numerical simulation was performed to calculate the transmission loss results. The transmission loss (TL) results indicated that the second neck length can influence the second resonance frequency and TL max . Changing the cavity volume significantly influences the noise attenuation ability under lower flow rate conditions compared to higher flow rate conditions. The flow Mach number had a more significant impact on the first TL peak than on the second TL peak. This study shows the relationship between the geometric parameters, grazing flow and noise attenuation performance of a dual HRs system and could provide guidance in designing suitable dual HRs for aero-engine systems.
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