With the development of civil low-pollution combustion technology and military high-temperature combustion technology, the problem of combustion instability is becoming more and more prominent. The perforated sound lining structure is designed in the main combustion chamber flame cylinder, afterburner anti-vibration screen, center cone, and other structures, which has important application prospects for absorbing the sound waves generated by unstable combustion. In order to improve the absorption bandwidth of the perforated acoustic lining with traditional single configuration, a multi-order resonant sound-absorbing metamaterial was proposed to extend the effective bandwidth of sound absorbing structures, and a composite structure model was established combining the traditional micro-perforated sound-absorbing structure with the micro-perforated sound-absorbing structure with curved channels. Its sound absorption performance was studied by finite element method. The results demonstrate that, compared to conventional single-layer micro-perforated absorbers, this model significantly improves sound absorption performance across the 300~700 Hz frequency range.
Zhang et al. (2026) studied this question.