OVERVIEW OF THE EXPERIMENTAL DETERMINATION OF ACOUSTIC FLOW ON THE BASIS OF SOUND INTENSITY MEASUREMENTS
DOI:
https://doi.org/10.7494/mech.2014.33.1.26Keywords:
flow acoustics, sound intensity, sound imagingAbstract
A large variety of CFD/CAA hybrid approaches are commonly used today for aero-acoustic engineering applications using equations and the coupling between source and acoustic propagation region. The coupling is usually made using Lighthill’s acoustic analogies and Kirhchoff’s acoustic boundary conditions. This paper intends to give answer how the size and shape of the source may be influence on the accuracy of the different coupling methods and their sensitivity. In this way, some experimental investigation was made using sound intensity measurement technique to the graphic presentation of the spatial distribution of the acoustic power flow over various geometrical shapes of structures located in a three-dimensional space. The results of these studies contribute to the theory of sound and general knowledge about the physics of flow acoustic phenomena, especially in the near acoustic field. As a result of research, the visualization analysis of the sound intensity flux in 3D space is shown as flow wave reactions on the presence of obstacles with different shapes. The results of vectors flow fields around a rectangular and circular plate, over the cavity and inside a ducts are show. The visualization of acoustic power flow in real-life acoustic fields can explain many particular energetic acoustic effects like scattering, vortex flow in shielding area, etc., concerning areas where it is difficult to make numerical analysis.
Downloads
References
Crighton D.G. et al., 1966, Modern Methods in Analytical Acoustics. Springer- Verlag, London.
Dickinson R.R., 1989, A unifield approach to the design of visualization software for the analysis of field problems. Proc. Three-dimensional Visualization and Display Technologies, Spie, 173–180.
Fahy F.J., 1989, Sound Intensity. Elsevier Applied Science, London.
Ffowcs Williams J.E., 1996, Aeroacoustics. Journal of Sound and Vibration, 190(3), 387–398.
Gerald-Yamasaki M., 1995, Visualization of Computational Fluid Dynamics. CFD Revue 1995.
Gloerfelt X., Bailly C., Juve D., 2003, Direct computation of the noise radiated by a subsonic cavity flow and application of integral methods. Journal of Sound and Vibration, 266(1), 119–146.
Hafez M., Oshima K., 1995, Computational Fluid Dynamics Review. John Wiley & Sons, Chichester.
Hargreaves D.M., Morvan H.P., Wright N.G., 2007, Validation of the volume of fluid method for free surface calculation: the broad-crested weir. Engineering Applications of Computational Fluid Mechanics, vol. 1, no.2, 136–164.
Lighthill M.J., 1952, On sound generated aerodinamically – I. General theory. Proc. of the Royal Society A 211, 564–587.
Mak C.M., Oldham D.J., 1995, The application of computational fluid dynamics to the prediction of regenerated noise in ventilation system. Inter-Noise, Newport Beach, CA, 281–284.
Munson B.R., Young D.F., Okiishi T.H., 1990, Fundamentals of Fluid Mechanics. Wiley, New York.
Raffel M., Willert C., Kompenhans J., 1998, Particle-image Velocimetry. A Practical Guide. Springer, Heidelberg.
Richards S.K., Zhang X., Chen X.X., Nelson P.A., 2004, The evaluation of non-reflecting boundary conditions for duct acoustic computation. Journal of Sound and Vibration, 270, 539–557.
Wagner C., Huttl T., Sagaut P., 1989, Large-eddy Simulation for Acoustics. Cambridge Univ. Press, Cambridge.
Weyna S., 2007, Some comments about the existing theory of sound with comparison to the experimental research of vector effects in real-life acoustic near fields. Archives of Acoustics vol. 32, no 4, 441–451.
Weyna S., 2009a, Experimental study of sound propagation in open duct with variable geometry. 16-th International Congress on Sound and Vibration, ICSV16, Kraków 2009, S-187.
Weyna S., 2009b, Visualization method of acoustic wave propagation in reallife conditions. The First International Conference on Soft Computing Technology in Civil, Structural and Environmental Engineering. Madeira 2009 Civil-Comp Press, 97–104.
Weyna S., 2010a, Acoustic intensity imaging methods for in-situ wave propagation. Archives of Acoustics. 35(2), 2010, 265–273.
Weyna S., 2010b, An acoustics intensity based investigation of the energy flow over the barriers. Acta Physica Polonica A vol. 118, 172–178.
Weyna S., 2011, Acoustics flow visualization method – seeing the invisible. Proc. The 8th International Conference on Fuzzy systems and Knowledge Discovery, Shanghai.
Weyna S., 2012a, Acoustics flow field visualization using sound intensity and laser anemometry methods. XX Fluid Mechanics Conference KKMP2012, Gliwice, 27–2.
Weyna S., 2012b, Visualization method of acoustic wave propagation based on the sound intensity measurement. Chapter in: Nowicki A. (ed.), Acoustic Imaging. Springer, vol. 31. 243–252.
Weyna S., 2013, Visualizations of the subsonic acoustic wave flow inducing noise inside open ducts. Proc. 20th International Congress on Sound and Vibrations, ICSV20, Bangkok.
Weyna S., 2014, Acoustics flow analysis in circular duct using sound intensity and dynamic mode decomposition. XXI Fluid Mechanics Conference, Journal of Physics: Conference Series 530 (2014), 012046.
Weyna S., MickiewiczW., Pyła M., Jabłoński M., 2013, Experimental acoustic flow analysis inside a section of an acoustic waveguide. Archives of Acoustics, vol. 38(2), 211–216.
Williams E.G., 1999, Fourier Acoustics – Sound Radiation and Nearfield Holography. Academic Press. San Diego, London, New York.
Zhang Zh., 2010, LDA Application Methods – Laser Doppler Anemometry for Fluid Dynamics. Springer.
Downloads
Published
Issue
Section
License
Remember to download, sign, scan and attach the copyright notice
This file should be uploaded as a Supplementary file (Step 4) of the submission procedure.
