What is it about?
Acoustic measurements in the aero-engine intra-stage are suitable for estimating the relative contribution of the rotor (fan) and the OGV (outlet guide vanes) broadband (BB) noise sources. In this paper, I discuss the design of efficient microphone arrays as well as the development of suitable phased array techniques to accomplish the source separation of the fan BB noise in the engine intra-stage.
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Why is it important?
In this paper, I present a generalized framework that would enable one to develop appropriate phased array techniques for any given intra-stage microphone array geometry. As an illustration, this paper uses the proposed framework to develop numerous phased array techniques out of the microphone array geometry of a model turbofan engine and successfully demonstrates their measurement capabilities. The work presented in this paper would guide fan noise engineers to design effective intra-stage microphone arrays for source separation of the fan broadband noise.
Perspectives
This paper is among the first articles to focus on the design of microphone array geometries for aero-engine intra-stages. One of the methods developed in this paper was applied on the measured intra-stage noise data to predict the broadband levels of the rotor and the OGV, and was presented in a companion paper titled, "Estimation of the relative balance between the rotor and the OGV broadband noise", which won the best student paper in aeroacoustics at the 2023 AIAA Aviation Forum and Exposition held in San Diego, CA from 12-16 June, 2023.
Mr. Ram Kumar Venkateswaran
University of Southampton
Read the Original
This page is a summary of: Generalized microphone array geometries for source separation in engine intra-stages, June 2023, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2023-3816.
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