Noise characteristic analysis and sound sources identification for rod–airfoil interaction using different subgrid-scale models

Four subgrid-scale models based on large eddy simulation (LES), such as Smagorinsky–Lilly (SL), dynamic (DSL), wall-adapting local eddy-viscosity (WALE), and kinetic-energy transport (KET) were used couple Ffowcs Williams–Hawkings equation to accurately analyze identify the characteristics position of sound sources rod–airfoil interaction. The results four compared with experimental data. It was found that DSL model optimal for study interaction noise considering calculation accuracy. Therefore, selected analyzing identifying location source. During calculation, solid permeable data surfaces acoustic integral surfaces. show impact quadrupole source is negligible at a low Mach number, dipole coming from pressure fluctuations dominant. Meanwhile, airfoil louder than rod; leading edge about 30% chord length main interference effect. Above can provide guidance research blade-vortex noise.