Wake-aerofoil interaction noise control with trailing-edge serrations

The present study experimentally investigates the effective reduction of wake-aerofoil interaction noise in a tandem aerofoil configuration using trailing-edge sawtooth serrations. far-field results clearly show that at ‘head-on’ wake impingement, use serrations on front can lead to substantial approximately 10 dB without any noticeable increase other frequencies and changes directivity pattern. Subsequently, detailed near-field measurements were carried out investigate further flow dynamics associated with noise. field unsteady loading suggest primarily takes place within first 30% chord close leading-edge area, while towards trailing-edge, is influenced more heavily by boundary layer development. velocity wall pressure fluctuation spectra significant decrease energy frequency content structures over range after due modification turbulence This leads notable aerodynamic loading, particularly lift direction. Further coupled pressure–velocity analyses reveal modify dominant eddies spreading it wider range. Near-field coherence also reveals loss coherence, thus abatement radiated experimental are relevant practical applications rotor–stator outlet guide vanes.