On the Application of Line Distributed Singularities for Fast Non - Empirical Prediction of Tonal Rotor Noise
* Presenting author
Abstract:
Noise abatement requirements for future unconventional propulsion concepts pose the challenge for aircraft manufacturers of reliably predicting noise emissions. In a previous work, a fast and physical-principles based rotor noise model was introduced, based on rotating source singularities, in combination with suitable adapted perturbation equations to represent current and possibly newly arising noise sources mechanisms. The model was applied in a Computational Aeroacoustics (CAA) framework in the time domain, and implemented in the unstructured quadrature-free experimental Discontinuous Galerkin (DG) CAA solver DISCO++ of DLR. In this contribution, the benefit of modelling rotor blades by means of distributed line source singularities is investigated. An analysis of the effect on the sound field due to the possibility of defining singularities location on straight or curved lines will be considered. The results obtained will be compared to analytically-based models, for validation purposes. The conclusions of this work will be used for future applications of installed propulsion concepts.