Turbulence interaction noise
A. Piccolo (TU Delft - Wind Energy)
D. Ragni – Promotor (TU Delft - Wind Energy)
F. Avallone – Promotor (TU Delft - Wind Energy)
R. Zamponi – Copromotor (TU Delft - Wind Energy)
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Abstract
Turbulence-interaction noise arises from unsteady surface pressure fluctuations caused by the interaction of incoming turbulence with an aerofoil or rotor. This type of flow induced noise is relevant across a range of diverse applications. Consequently, multiple physical mechanisms must be examined and analytically modelled for use in low-fidelity prediction methods. Such models are particularly valuable during the design and optimisation phases due to their low computational cost. However, their accuracy is critically dependent on the fidelity of the underlying physical assumptions. One of the most widely used and robust approaches, Amiet’s model, has been shown to produce inaccurate results for thick blades, as it was originally developed for flat plates. This limitation is likely due to the distortion of the incoming turbulent structures and the alteration of the noise radiation caused by aerodynamic surfaces of non-negligible thickness. Comparable limitations affect its application to rotors, where an accurate representation of the inflow conditions is essential to ensure the reliability of the prediction. The present study seeks to address the following three research questions:
1. How does turbulence distortion affect noise generation and prediction?
2. How can turbulence-distortion effects be included in Amiet’s model?
3. How does this apply to rotors?