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

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.

References
[1] Kårekull, Oscar. “Predicting Flow-Generated Noise from HVAC Components.” PhD. thesis, Engineering Sciences, KTH Royal Institute of Technology, 2015.
[2] David, Antoine, Florian Hugues, Nicolas Dauchez, and Emmanuel Perrey-Debain. 2018 “Vibrational Response of a Rectangular Duct of Finite Length Excited by a Turbulent Internal Flow.” Journal of Sound and Vibration 422: 146–60. https://doi.org/10.1016/j.jsv.2017.11.052
[3] Norton, Micheal, Karczub Denis. Fundamentals of Noise and Vibrations for Engineers. 2nd ed. Cambridge University Press, 2003. https://doi.org/10.1017/CBO9781139163927
[4] Curle, N., and M. J. Lighthill. “The Influence of Solid Boundaries upon Aerodynamic Sound.” Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences 231, no. 1187 (1955): 505–14. https://doi.org/10.1098/rspa.1955.0191
[5] Davies, H. G., and J. E. Ffowcs Williams. “Aerodynamic Sound Generation in a Pipe.” Journal of Fluid Mechanics 32, no. 4 (June 18, 1968): 765–78. https://doi.org/10.1017/S0022112068001011
[6] Nelson, P.A., and C.L. Morfey. “Aerodynamic Sound Production in Low Speed Flow Ducts.” Journal of Sound and Vibration 79, no. 2 (November 1981): 263–89. https://doi.org/10.1016/0022-460X(81)90372-2
[7] Oldham, D.J., and A.U. Ukpoho. “A Pressure-Based Technique for Predicting Regenerated Noise Levels in Ventilation Systems.” Journal of Sound and Vibration 140, no. 2 (July 1990): 259–72. https://doi.org/10.1016/0022-460X(90)90527-7
[8] Tao, Fuyang, Phillip Joseph, Xin Zhang, Oksana Stalnov, Matthias Siercke, and Henning Scheel. “Investigation of the Sound Generation Mechanisms for In-Duct Orifice Plates.” The Journal of the Acoustical Society of America 142, no. 2 (August 2017): 561–72. https://doi.org/10.1121/1.4996459
[9] Trabelsi, Hassen, Nicolas Zerbib, Jean-Michel Ville, and Félix Foucart. 2011. “Passive and Active Acoustic Properties of a Diaphragm at Low Mach Number: Experimental Procedure and Numerical Simulation.” European Journal of Computational Mechanics 20(1–4): 49–71. https://doi.org/10.3166/ejcm.20.49-71
[10] Doak, P.E. “Excitation, Transmission and Radiation of Sound from Source Distributions in Hard-Walled Ducts of Finite Length (I): The Effects of Duct Cross-Section Geometry and Source Distribution Space-Time Pattern.” Journal of Sound and Vibration 31, no. 1 (November 1973): 1–72. https://doi.org/10.1016/S0022-460X(73)80249-4