The investigation of counter-rotating turbomachinery broadband noise sources as a function of rotational speed

Romasz, Ádám and Tokaji, Kristóf and Horváth, Csaba (2022) The investigation of counter-rotating turbomachinery broadband noise sources as a function of rotational speed. In: Proceedings of Conference on Modelling Fluid Flow (CMFF'22). Budapesti Műszaki és Gazdaságtudományi Egyetem, Gépészmérnöki Kar, Áramlástan Tanszék, Budapest, pp. 173-181. ISBN 9789634218814

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Abstract

Counter-rotating turbomachinery often appear in modern aerospace applications. Along with their numerous advantageous properties they are also known to produce high amounts of noise. The emitted noise consists of tonal and broadband noise components, which can be studied utilizing beamforming technology. In order to analyse them more efficiently and reach a better understanding of the noise generation mechanisms, these noise components must be separated. The Double Filtering Method allows one to separate these two noise source categories, making it possible to examine broadband noise components without any interference from tonal noise components. In this paper a series of studies are carried out on various parameters that influence the effectiveness of the Double Filtering Method. The investigation then goes on to apply the method, investigating the effects of changing rotational speed on the broadband noise sources of counter-rotating open rotors, presenting the various categories of broadband noise sources and their occurrence on the beamforming maps and in the spectra. Four major categories are looked at as a function of rotational speed: two different blade angles (simulating conditions), take-off and approach and two different installations (uninstalled and installed with a pylon).

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