Numerical analysis of pressure drop and acoustic attenuation performance of two helicoidal resonators arranged in parallel ducts with different rotation angles

• Autorzy: Łapka W.
• Konferencja: Symposium Vibrations In Physical Systems (27 ; 09-13.05.2016 ; Będlewo koło Poznania ; Polska)
• Języki publikacji: EN

Abstrakty

EN

The paper presents a numerical analysis of pressure drop and acoustic attenuation performance (transmission loss) of two identical acoustic helicoidal resonators arranged in parallel ducts with different rotation angles. The air stream is divided from one cylindrical duct of a diameter D=140mm to a two parallel cylindrical ducts of diameter d=125mm with two helicoidal resonators inside – one per one duct. The ratio of helicoidal pitch s of helicoidal resonators to a cylindrical duct diameter d equals s/d=1,976. Other geometrical relationships of helicoidal resonators, as a mandrel diameter dm to duct diameter ratio dm/d=0.024, thickness g of helicoidal profile g/d=0.0024, and the number of helicoidal turn n=0,695 for both resonators. The investigated range of rotation angles covered the three characteristic positions of helicoidal resonators gaps, when considering the air stream distribution from central large duct with diameter D. The value of normal inflow velocity v[m/s] equaled 1 for all investigated cases.

Słowa kluczowe

EN

helicoidal resonator; pressure drop; acoustic attenuation; parallel ducts; flow distribution; numerical analysis

PL

rezonator helikoidalny; spadek ciśnienia; tłumienność akustyczna; rozkład przepływu; analiza numeryczna

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2016
• Tom: Vol. 27
• Strony: 237--244
• Opis fizyczny: Bibliogr. 22 poz., il. kolor., wykr.

Twórcy

autor

Łapka W.

• Poznan University of Technology, Institute of Applied Mechanics Jan Paweł II 24 Street, 61-139 Poznań

Bibliografia

• 1. W. Łapka, C. Cempel, Acoustic filter for suppressing the sound in the channel installations, Polish Patent Office, Patent Number PL216176-B1, Publ. Date 31 MAR 2014.
• 2. W. Łapka, C. Cempel, Noise reduction of spiral ducts, International Journal of Occupational Safety and Ergonomics (JOSE), 13(4) (2007) 419 – 426.
• 3. W. Łapka, Acoustic attenuation performance of a round silencer with the spiral duct at the inlet, Archives of Acoustics (Supplement), 32(4) (2007) 247 – 252.
• 4. W. Łapka, C. Cempel, Computational and experimental investigations of a sound pressure level distribution at the outlet of the spiral duct, Archives of Acoustics (Supplement), 33(4) (2008), 65 – 70.
• 5. W. Łapka, C. Cempel, Acoustic attenuation performance of Helmholtz resonator and spiral duct, Vibrations in Physical Systems, 23 (2008) 247 – 252.
• 6. W. Łapka, Insertion loss of spiral ducts - measurements and computations, Archives of Acoustics, 34(4) (2009) 407 – 415.
• 7. W. Łapka, Substitutional transmittance function of helicoidal resonator, Vibrations in Physical Systems, 24 (2010) 265 – 270.
• 8. W. Łapka, Comparison of numerically calculated pressure drop for selected helicoidal resonators, Proceedings of the 59th Open Seminar on Acoustics joint with Workshop on Strategic Management of Noise including Aircraft Noise, Polskie Towarzystwo Akustyczne - Oddział Poznański, (2012) 145 – 148.
• 9. W. Łapka, Numerical Aeroacoustic Research of Transmission Loss Characteristics Change of Selected Helicoidal Resonators due to Different Air Flow Velocities, Vibrations in Physical Systems, 25 (2012) 267 – 272.
• 10. W. Łapka, Multi resonant helicoidal resonator for passive noise control in ducted systems, Experimental Mechanics- New Trends and Perspectives, Editors J.F. Silva Gomes, Mario A.P. Vaz, Proceedings of the 15th International Conference on Experimental Mechanics, ICEM15, Porto, Portugalia, 22-27 lipiec 2012, 995 – 996, 2012.
• 11. W. Łapka, Helicoidal resonators for passive noise control in ducted systems with practical application, Proceedings of Internoise 2012, New York, USA, 2012.
• 12. W. Łapka, Numerical study of acoustic-structure interaction of selected helicoidal resonator with flexible helicoidal profile, Postępy Akustyki, Polskie Towarzystwo Akustyczne - Oddział w Rzeszowie, Rzeszów, (2013) 194 – 205.
• 13. W. Łapka, M. Szymański, R. Górzeński, Badania oporów przepływu w zależności od strumienia objętości powietrza w kanale dla wybranych rezonatorów helikoidalnych, Postępy Akustyki, Polskie Towarzystwo Akustyczne - Oddział w Rzeszowie, Rzeszów, (2013) 168 – 180.
• 14. W. Łapka, Transmission Loss and Pressure Drop of Selected Range of Helicoidal Resonators, Vibrations in Physical Systems, 26 (2014) 121 – 128.
• 15. W. Łapka, Fan duct noise elimination by the use of helicoidal resonators, Proceedings of Inter-Noise 2014, 16-19 November 2014, Melbourne, Australia, 2014.
• 16. W. Łapka, P. Kędzia, Numerical analysis of transmission loss and pressure drop of helicoidal resonators in straight cylindrical ducts, Proceedings of Forum Acusticum 2014, 7-12 September 2014, Kraków, Poland, 6 pages in CD, 2014.
• 17. W. Łapka, Acoustic attenuation performance of selected helicoidal resonators lined with an absorbent materials of different thickness and density, Proceedings of Inter-Noise 2013, Innsbruck, Austria, 2013, 8 pages in CD, 2013.
• 18. COMSOL Multiphysics, User’s Guide and Model Library Documentation Set, COMSOL AB, www.comsol.com, Stockholm, Sweden, 2016.
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• 20. S. Marburg, B. Nolte, Computational Acoustics of Noise Propagation in Fluids – Finite and Boundary Element Methods, 578, Springer-Verlag, Berlin, Germany, 2008.
• 21. D. C. Wilcox, Turbulence Modeling for CFD, 3rd edition, DCW Industries, Inc., La Canada CA, 2006.
• 22. D. C. Wilcox, Formulation of the k-omega Turbulence Model Revisited, AIAA Journal, 46(11) (2008) 2823 – 2838.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.