Abstract
The airflow in the mouth of an open and closed flue organ pipe of corresponding geometrical proportions is studied. The phase locked particle image velocimetry with subsequent analysis by the biorthogonal decomposition is employed in order to compare the flow mechanisms and related features. The most significant differences lie in the mean velocity distribution and rapidity of the jet lateral motion. Remarks on the pressure estimation from PIV data and its importance for the aeroacoustic source terms are made and a specific example is discussed.Keywords:
particle image velocimetry, acoustics of music instruments, organ pipes, edge aerophonesReferences
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14. Hruška V., Dlask P. (2017), Connections between organ pipe noise and Shannon entropy of the airow: Preliminary results, Acta Acustica united with Acustica, 103, 1100–1105.
15. Lin D., Powell A. (1998), The scattering of hydrodynamic flow into sound by solid bodies – An alternative derivation of Howe's formula, [in:] Proceedings of ICA, vol. 1, pp. 509–510, Seattle, USA.
16. MacDonald R. (2009), A study of the undercutting of woodwind toneholes using particle image velocimetry, Doctoral Thesis, University of Edinburgh.
17. Melling A. (1992), Tracer particles and seeding for particle image velocimetry, Measurement Science and Technology, 8, 12, 1406–1416.
18. Mickiewicz W. (2015), Particle image velocimetry and proper orthogonal decomposition applied to aerodynamic sound source region visualization in organ flue pipe, Archives of Acoustics, 40, 4, 475–484.
19. Miyamoto M. et al. (2013), Numerical study on acoustic oscillations of 2D and 3D flue organ pipe like instruments with compressible LES, Acta Acustica united with Acustica, 99, 1, 154–171.
20. Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P. (2007), Numerical recipes. The art of scientific computing, 3rd ed., Cambridge University Press, Cambridge.
21. Uosukainen S. (2011), Foundations of acoustic analogies, VTT Publications, Helsinki.
22. Uruba V. (2012), Decomposition methods in turbulence research, EPJ Web of Conferences, 25, 01095, 21 pages.
23. van Oudheusden B.W. (2013), PIV-based pressure measurement, Measurement Science and Technology, 24, 3, 032001.
24. Vignola J.F., Berthelot Y.H., Jones S., Jarzynski J. (1992), Equation of motion of microparticles in suspension in an insonified medium. Journal of Acoustical Society of America, 92, 332–334.
25. Yoshikawa S., Tashiro H., Sakamoto Y. (2012), Experimental examination of vortex-sound generation in an organ pipe: A proposal of jet vortex-layer formation model, Journal of Sound and Vibration, 331, 11, 2558–2577.
2. Bamberger A. (2008), Vortex sound of the flute and its interpretation, The Journal of the Acoustical Society of America, 123, 5, 3239–3239.
3. Batchelor G.K. (2000), An introduction to fluid dynamics, Cambridge University Press, Cambridge.
4. Cabral B., Leedom L. (1993), Imaging vector fields using line integral convolution, [in:] Proceedings of the 20th annual conference on Computer graphics and interactive techniques, SIGGRAPH '93, pp. 263–270, Anaheim, CA.
5. Červenka M., Bednařík M. (2016), Variety of acoustic streaming in 2d resonant channels, Wave Motion, 66, 21–30.
6. Chaigne A., Kergomard J. (2016), Acoustics of musical instruments, Springer, New York, NY.
7. de Kat R., van Oudheusden B.W. (2011), Instantaneous planar pressure determination from PIV in turbulent flow, Experiments in Fluids, 52, 5, 1089–1106.
8. Fabre B., Gilbert J., Hirschberg A., Pelorson X. (2012), Aeroacoustics of musical instruments, Annual Review of Fluid Mechanics, 44, 1–25.
9. Fletcher N., Rossing T. (1998), The physics of musical instruments, Springer, New York.
10. Guštar M., Dlask P. (2018), Programmable generator of external triggering signal for dantec PIV timer box 80N77, [in:] 2018 International Conference on Applied Electronics, 11–12 Sept., Pilsen, Czech Republic.
11. Hirschberg A., Rienstra S.W. (2004), An introduction to aeroacoustics, Free online source, https://www.win.tue.nl/~sjoerdr/papers/les-swr-mh.pdf.
12. Howe M.S. (1975), The generation of sound by aerodynamic sources in an inhomogeneous steady flow, Journal of Fluid Mechanics, 67, 3, 597–610.
13. Howe M.S. (2002), Theory of vortex sound, Cambridge University Press, Cambridge.
14. Hruška V., Dlask P. (2017), Connections between organ pipe noise and Shannon entropy of the airow: Preliminary results, Acta Acustica united with Acustica, 103, 1100–1105.
15. Lin D., Powell A. (1998), The scattering of hydrodynamic flow into sound by solid bodies – An alternative derivation of Howe's formula, [in:] Proceedings of ICA, vol. 1, pp. 509–510, Seattle, USA.
16. MacDonald R. (2009), A study of the undercutting of woodwind toneholes using particle image velocimetry, Doctoral Thesis, University of Edinburgh.
17. Melling A. (1992), Tracer particles and seeding for particle image velocimetry, Measurement Science and Technology, 8, 12, 1406–1416.
18. Mickiewicz W. (2015), Particle image velocimetry and proper orthogonal decomposition applied to aerodynamic sound source region visualization in organ flue pipe, Archives of Acoustics, 40, 4, 475–484.
19. Miyamoto M. et al. (2013), Numerical study on acoustic oscillations of 2D and 3D flue organ pipe like instruments with compressible LES, Acta Acustica united with Acustica, 99, 1, 154–171.
20. Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P. (2007), Numerical recipes. The art of scientific computing, 3rd ed., Cambridge University Press, Cambridge.
21. Uosukainen S. (2011), Foundations of acoustic analogies, VTT Publications, Helsinki.
22. Uruba V. (2012), Decomposition methods in turbulence research, EPJ Web of Conferences, 25, 01095, 21 pages.
23. van Oudheusden B.W. (2013), PIV-based pressure measurement, Measurement Science and Technology, 24, 3, 032001.
24. Vignola J.F., Berthelot Y.H., Jones S., Jarzynski J. (1992), Equation of motion of microparticles in suspension in an insonified medium. Journal of Acoustical Society of America, 92, 332–334.
25. Yoshikawa S., Tashiro H., Sakamoto Y. (2012), Experimental examination of vortex-sound generation in an organ pipe: A proposal of jet vortex-layer formation model, Journal of Sound and Vibration, 331, 11, 2558–2577.
