Development of a measurement methodology for the beamforming investigation of centrifugal fans

Kocsis, Bálint and Tokaji, Kristóf and Leiber, Robin and Probst, Matthias and Istók, Balázs and Zhang, Haitian and Pritz, Balázs and Horváth, Csaba (2024) Development of a measurement methodology for the beamforming investigation of centrifugal fans. In: 10th Berlin Beamforming Conference, BeBeC 2024, 2024.06.10-2024.06.11, Berlin.

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Abstract

The investigation of turbomachinery applications using beamforming technology is rather common in the aeroacoustics community, but usually restricted to the investigation of axial flow turbomachinery. This investigation presents the development of a measurement setup and beamforming methodology that enables the investigation of centrifugal turbomachinery. A test setup utilizing Acoustically Transparent Duct technology has been built and tested on a centrifugal fan testbench at the Karlsruhe Institute of Technology. Measurements have been carried out on the test setup using a planar phased microphone array as well as a radial phased microphone array by colleagues from the Budapest University of Technology and Economics. The data has been processed using the ROSI beamforming method and the Segmented ROSI beamforming method. The investigation presents sample data for each approach and discusses the advantages and disadvantages of each. It is shown that the beamforming investigation of a centrifugal test bench can successfully be carried utilizing this technology, with each approach having its advantages and disadvantages.

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