Parametric Noise source model development of Counter Rotating Open Rotor

Counter Rotating Open Rotors are a possible response to the demands of future aviation propulsion. Their benefit of low fuel consumption grants operation particularly for rising kerosene price. Detrimental is the high level of noise emission, especially tonal sound. For prospective development and implementation to modern aviation, noise prediction tools are essential. Delft University of Technology currently develops an automated aircraft design tool, which considers different disciplines. One of which is the noise prediction tool called INSTANT, already capable to predict noise emissions of turbofan engines. This thesis report presents and explains the development of an in-design noise prediction tool for Counter Rotating Open Rotors as a starting point for an advancement in application variability of INSTANT. A two-system approach, based on an analytical and a semi-empirical tool, is implemented to increase the tool’s fidelity and optionally keep its computation time minimum. The analytical tool relies on blade discretisation and aerodynamic properties, while the semi-empirical tool is based on empirical analogies. To a certain extend, the user is able to choose the algorithmof evaluation. Both tools show good predictive performance, however the analytical tool offers potential to further refine its capabilities of prognosis.

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Student theses

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master thesis

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Final_Thesis_Klespe_4192117.pdf

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