Airfoil noise reductions through leading edge serrations

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Performance and mechanism of sinusoidal leading edge serrations for the reduction of turbulence–aerofoil interaction noise (2017, methodology): “It has been demonstrated by the authors of the current paper (Narayanan et al. 2014; Haeri et al. 2014; Narayanan et al. 2015; Chaitanya et al. 2015b; Kim et al. 2016) and others that introducing leading edge serrations can be an effective method of reducing far field noise.”
On the reduction of aerofoil–turbulence interaction noise associated with wavy leading edges (2016, methodology): “It is shown in figure 7 that the relative reduction of ATI noise in decibels increases with the amplitude of the WLE profile in an almost linear fashion, which has also recently been observed experimentally by Narayanan et al. (2015) and numerically by Lau et al. (2013).”