Multi-modal noise generation in low Mach number orifice plates: an experimental investigation

L.N. Quaroni; I. Ramadan; S. Rampnoux; S. Malavasi; E. Perrey-Debain

doi:10.21741/9781644902431-112

Multi-modal noise generation in low Mach number orifice plates: an experimental investigation

Luca Nicola QUARONI, Islam RAMADAN, Simon RAMPNOUX, Stefano MALAVASI, Emmanuel PERREY-DEBAIN

Abstract. An experimental campaign on aerodynamic noise generation by orifice plates in rectangular ducts for low Mach number flows is carried. The test plant allows for the measurement of the total emitted acoustic power both upstream and downstream of the orifice plates for varying mass flow rates through the 2N-Port method. A modal decomposition for the first eight propagating higher-order acoustic modes is also performed. Keeping the free flow area and the plates’ thickness constant, the tests allowed for a study of the influence of the number of circular orifices on the generated acoustic power as well as its modal composition. It is found that the orifices’ number does not influence the overall pressure drop caused by the presence of the obstacle. The generated noise on the contrary is greatly affected by such a parameter both for the plane-wave frequency range and especially so in the multi-modal one.

Keywords
Duct Acoustics, Orifice Plates, Higher-Order Acoustic Modes

Published online 3/17/2022, 6 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Luca Nicola QUARONI, Islam RAMADAN, Simon RAMPNOUX, Stefano MALAVASI, Emmanuel PERREY-DEBAIN, Multi-modal noise generation in low Mach number orifice plates: an experimental investigation, Materials Research Proceedings, Vol. 26, pp 699-704, 2023

DOI: https://doi.org/10.21741/9781644902431-112

The article was published as article 112 of the book Theoretical and Applied Mechanics

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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