Aeroacoustic noise reduction of open photoacoustic cells supported by experiments and simulations

Balogh, Miklós and Koscsó, Gábor and Kocsis, Bálint and Horváth, Csaba and Bozóki, Zoltán (2022) Aeroacoustic noise reduction of open photoacoustic cells supported by experiments and simulations. In: Proceedings of Conference on Modelling Fluid Flow (CMFF'22). Budapesti Műszaki és Gazdaságtudományi Egyetem, Gépészmérnöki Kar, Áramlástan Tanszék, Budapest, pp. 452-459. ISBN 9789634218814

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Abstract

In this study aeroacoustic investigations have been carried out in order to further develop the critical components of a quick responding, open, continuously measured detection cell based photoacoustic (PA) measurement system, in order to reduce the aeroacoustic noise. This is a key aspect to operate the recently developed open PA cell under high velocity throughflow conditions. As compared to other, sampling-based PA systems, the photoacoustic component of the newly developed instrument presented herein is better integrated, significantly reduced in weight and size, and the gas flowrate that can be analysed is several orders of magnitude higher. A good aeroacoustic design is extremely important for an open PA cell, since significant acoustic noise can be generated even at relatively low flow rates, which drastically reduces the signal-to-noise ratio of the concentration measurements. The geometric constraints of the PA measurement system also must be considered. In addition, the structure must be sufficiently rigid so that the interactions between velocity fluctuations and the solid body do not cause mechanical vibrations. The new method has been developed to provide an improved aeroacoustic. Both numerical and experimental investigations have been carried out for the verification of this new method.

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