A porous media model for the numerical simulation of acoustic attenuation by perforated liners in the presence of grazing flows

Wang, Jianguo; Rubini, Philip; Qin, Qin

Abstract

In this paper, a novel model is proposed for the numerical simulation of noise-attenuating perforated liners. Effusion cooling liners offer the potential of being able to attenuate combustion instabilities in gas turbine engines. However, the acoustic attenuation of a perforated liner is a combination of a number of interacting factors, resulting in the traditional approach of designing perforated combustor liners relying heavily on combustor rig tests. On the other hand, direct computation of thousands of small-scale holes is too expensive to be employed as an engineering design tool. In recognition of this, a novel physical velocity porous media (PVPM) model was recently proposed by the authors as a computationally less demanding approach to represent the acoustic attenuation of perforated liners. The model was previously validated for the normal incidence of a sound wave by comparison with experimental data from impedance tubes. In this paper, the model is further developed for configurations where the noise signal propagates in parallel with the perforated liners, both in the presence and absence of a mean flow. The model is significantly improved and successfully validated within coexisting grazing and bias flow scenarios, with reference to a series of well-recognized experimental data.

Citation

Wang, J., Rubini, P., & Qin, Q. (2021). A porous media model for the numerical simulation of acoustic attenuation by perforated liners in the presence of grazing flows. Applied Sciences, 11(10), Article 4677. https://doi.org/10.3390/app11104677

• Journal Article Type: Article
• Acceptance Date: May 17, 2021
• Online Publication Date: May 20, 2021
• Publication Date: May 2, 2021
• Deposit Date: Apr 5, 2022
• Publicly Available Date: Apr 6, 2022
• Journal: Applied Sciences (Switzerland)
• Electronic ISSN: 2076-3417
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Issue: 10
• Article Number: 4677
• DOI: https://doi.org/10.3390/app11104677
• Keywords: Perforated liners; Acoustic damping; Porous media model; Acoustic passive control; Numerical simulation; Combustion instability; Effusion cooling walls
• Public URL: https://hull-repository.worktribe.com/output/3788011