Optimization of trailing-edge serrations with and without slits for broadband noise reduction

摘要: Abstract The single-objective surrogate-based optimization study of the trailing-edge serrations is performed using Ayton’s analytical model. parametric model provided, and main effect serration amplitude, wavelength shape curvature are investigated. spanwise coherence length wall-pressure fluctuations found to act as a filter for cut-on modes. problem solved with without slits. For three increasing values wavelength, optimal smoothly changes from ogee sawtooth sinusoidal or iron-shaped. noise reduction margin between best worst decreases wavelength. all shapes, largely uniform fδ/U0 > 0.63. slits be additive shape. It appears mostly after 1000 Hz. cases, optimum size tends maximum slit amplitude minimum frequency an increase in current represents practical approach towards further development serrations.