Reduction of acoustic cavitation noise emission with textile materials

Konrad Nering,

Krzysztof Nering

Abstrakt

This article presents an examination of the acoustic noise level reduction in piping applications. Hydraulic cavitation is the source of the noise. In order to determine the noise level drop for the insulating material arranged around the pipe – cylindrical geometry – the acoustic spectrum was measured in the range of audible frequencies. Measurements were made for textile materials stacked with varying amounts of layers around the source of noise. There was a decrease in the noise level characteristics for mass law. An empirical formula describing the relative noise reduction for the materials under study was proposed.

Słowa kluczowe: cavitation noise, acoustic insulation, noise emission reduction
References

[1]       Brennen Ch.E., Hydrodynamics of Pumps, Oxford University Press, Oxford, 1994.

[2]       Moussou P., Lafon Ph., Potapov S., Paulhiac L., Tijsseling A.S., Industrial cases of FSI due to internal flows, Eindhoven: Technische Universiteit Eindhoven, 2004, https://pure.tue.nl/ws/files/2005596/577049.pdf

[3]       Ruchonnet N., Alligné S., Nicolet Ch., Avellan F., Cavitation influence on hydroacoustic resonance in pipe. Journal of Fluids and Structures, Vol. 28, 2012, 180–193.

[4]       Reisman G.E., McKinney E.A., Brennen Ch.E., Cloud cavitation on an oscillating hydrofoil, Proceedings of the 20th Symposium on Naval Hydrodynamics. National Academy Press, Washington DC 1994, 328–340.

[5]       Testud P., Moussou P., Hirschberg A., Aurégan Y., Noise generated by cavitating single-hole and multi-hole orifices in a water pipe, Journal of Fluids and Structures, Vol. 23, 2007, 163–189.

[6]       Jian-min ZHANG, Qing YANG, Yu-rong WANG, Wei-lin XU, Jian-gang CHEN, Experimental investigation of cavitation in a sudden expansion pipe, Journal of Hydrodynamics, Vol. 23, 2011, 348–352.

[7]       Tijsseling A.S., Vardy A.E., Fan D., Fluid-structure interaction and cavitation in a single-elbow pipe system, Journal of Fluids and Structures, Vol. 10, 1996, 395–420.

[8]       Tijsseling A.S., Vardy A.E., Fluid–structure interaction and transient cavitation tests in a T-piece pipe, Journal of Fluids and Structures, Vol. 20, 2005, 753–762.

[9]       Wójs K., Kawitacja w cieczach o różnych właściwościach reologicznych, Oficyna Wydawnicza Politechniki Wrocławskiej, Wrocław 2004.

[10]   Borisyuk A.O., Experimental study of wall pressure fluctuations in rigid and elastic pipes behind an axisymmetric narrowing, Journal of Fluids and Structures, Vol. 26, 2010, 658-674.

[11]   Qi Datong, Mao Yijun, Liu Xiaoliang, Yuan Minjian, Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan, Applied Acoustics, Vol. 70, 2009, 1041–1050.

[12]   Doolan C.J., Moreau D.J.,Flow-induced noise generated by sub-boundary layer steps. Experimental Thermal and Fluid Science, Vol. 72, 2015, 47–58.

[13]   Norton M.P., Bull M.K., Mechanisms of the generation of external acoustic radiation from pipes due to internal flow disturbances, Journal of Sound and Vibration, Vol. 94, 1984, 105–146.

[14]   Kuhn G.F., Morfey C.L., Noise due to fully developed turbulent flow exhausting from straight and bent pipes, Journal of Sound and Vibration, Vol. 44, 1976, 27–35.

[15]   Zhang T., Zhang Y.O., Ouyang H., Structural vibration and fluid-borne noise induced by turbulent flow through a 90o piping elbow with and without a guide vane, International Journal of Pressure Vessels and Piping, 2015, 1–12.

[16]   Celik S., Nsofor E.C., Studies on the flow-induced noise at the evaporator of a refrigerating system, Applied Thermal Engineering, Vol. 31, 2011, 2485–2493.

[17]   Masaaki Mori, Takayuki Masumoto, Kunihiko Ishihara, Study on acoustic, vibration and flow induced noise characteristics of T-shaped pipe with a square cross-section. Applied Acoustics, Vol. 120, 2017, 137–147.

[18]   Testud P., Moussou P., Hirschberg A., Auregan Y., Noise generated by cavitating single-hole and multi-hole orifices in a water pipe, Journal of Fluids and Structures, Vol. 23 2007, 163–189.

[19]   Peshkovsky S.L., Peshkovsky A.S., Shock-wave model of acoustic cavitation. Ultrasonics Sonochemistry, Vol. 15, 2008, 618–628.

[20]   Mazzocchi E., Pachoud A.J., Farhat M., Hachem F.E., DeCesare G., Schleiss A.J., Signal analysis of an actively generated cavitation bubble in pressurized pipes for detection of wall stiffness drops, Journal of Fluids and Structures, Vol. 65, 2016, 60–75.

[21]   Cowan J., Building Acoustics, [in:] Springer Handbook of Acoustics, T.D. Rossing (ed.), Springer Science, Leipzig 2007, 390, 387–425.

[22]   Bies D.A., Hansen C.H.,Engineering Noise Control: Theory and Practice, Fourth Edition, 2003.

[23]   ISO 16283-1:2014, Acoustics – Field measurement of sound insulation in buildings and of building elements – Part 1: Airborne sound insulation, 2014