A Porous Media Model for the Numerical Simulation of Acoustic Attenuation by Perforated Liners in the Presence of Grazing Flows

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