Turbulence-cascade interaction noise using an advanced digital filter method

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Gea Aguilera, Fernando ; Gill, James ; Zhang, Xin ; Nodé-Langlois, Thomas (2016)
  • Subject:
    arxiv: Physics::Fluid Dynamics

Fan wakes interacting with outlet guide vanes is a major source of noise in modern turbofan engines. In order to study this source of noise, the current work presents two-dimensional simulations of turbulence-cascade interaction noise using a computational aeroacoustic methodology. An advanced digital filter method is used for the generation of isotropic synthetic turbulence in a linearised Euler equation solver. A parameter study is presented to assess the influence of airfoil thickness, mean flow Mach number, stagger angle and gap-to-chord ratio on noise. Results are validated against predictions from an analytical method for two-dimensional flat plate cascades. Fan wake modelling is also addressed by extending the advanced digital filter method to account for spatial variations of the turbulence intensity
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