Numerical investigation into slitted leading-edge profiles for reducing interaction noise

Cannard, Marine, Joseph, Phillip, Chaitanya, Paruchuri and Kim, Jae Wook (2018) Numerical investigation into slitted leading-edge profiles for reducing interaction noise. In 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. vol. 3, International Institute of Acoustics and Vibration. pp. 1366-1373 .

Abstract

Reducing aircraft noise has become a significant political issue over the last decade, with the establishment of more demanding regulations concerning noise emissions. Aerofoil-Turbulence Interaction noise is an inviscid phenomenon generated by the impingement of turbulent flows on the leading-edge of an aerofoil. Occurring during the interaction of the turbulent wakes from the rotor with the outlet guide vanes, ATI noise is believed to be the dominant broadband noise source on modern turbofan engines. A recent experimental study has shown the increased effectiveness of new innovative leading edge profiles for reducing ATI noise, in comparison to conventional sinusoidal or sawtooth profiles. Slitted leading-edges have been identified by far as the most effective geometry that has been tested in terms of noise reductions. This present project focuses on the investigation of these novel leading-edge geometries through a numerical approach and aims at understanding the noise reduction mechanisms in order to further optimize the serration geometries. In this study, a flat-plate in a uniform mean flow is numerically being impacted by vortical perturbations, modelled by a single spanwise vortex injected upstream of the aerofoil. The computational work is realised based on an optimized high-order finite difference solver, solving the full 3D compressible Euler equations in time-domain. Results concerning the surface pressure fluctuations generated on the flat-plate are being analysed and compared to results obtained with a straight LE. A special focus is laid on the identification of noise reduction mechanisms involved in the use of these particular serration profiles.

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Contributors

Author: Jae Wook Kim

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