Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct
This paper describes a computational and experimental investigations of a sound pressure level distribution at the outlet of the spiral duct. A finite element method was used to compute a three-dimensional numerical models in a COMSOL Multiphysics computer application. Both, numerical and experimen...
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| Format: | Article |
| Language: | English |
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Institute of Fundamental Technological Research Polish Academy of Sciences
2008-12-01
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| Series: | Archives of Acoustics |
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| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/837 |
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| author | Wojciech ŁAPKA Czesław CEMPEL |
| author_facet | Wojciech ŁAPKA Czesław CEMPEL |
| author_sort | Wojciech ŁAPKA |
| collection | DOAJ |
| description |
This paper describes a computational and experimental investigations of a sound pressure
level distribution at the outlet of the spiral duct. A finite element method was used to
compute a three-dimensional numerical models in a COMSOL Multiphysics computer application.
Both, numerical and experimental models of the spiral duct were placed solidly in
a circular duct and they were approximately of the same size with a mandrel placed axially.
For experimental investigations of sound pressure distribution, the measurements were carried
out in a square plane, about 16 cm per 16 cm, perpendicular to the mandrel’s axis and placed
at a distance of 2.5 cm from the outlet of the spiral duct. The nearest surroundings of the
outlet of the spiral duct was covered by an absorptive material. As the computational outlet
surroundings was set up an empty air volume with a boundary conditions of a characteristic
impedance of the air. This gives the same conditions as an anechoic chamber. It is presented
that computational model is very similar to experimental one. Specific sound pressure level
distribution at the outlet of the spiral duct is presented as computed and measured experimentally.
This comparison shows good agreement between experimental and numerical results
and it reveals great potential for applications as a newly discovered acoustic band stop filter –
the spiral duct.
|
| format | Article |
| id | doaj-art-226e6be4d8f74b9fa8e9bfa4c58218c9 |
| institution | DOAJ |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2008-12-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-226e6be4d8f74b9fa8e9bfa4c58218c92025-08-20T03:11:52ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2008-12-01334(S)Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral DuctWojciech ŁAPKA0Czesław CEMPEL1Poznań University of Technology, Institute of Applied Mechanics, Division of Vibroacoustics and Biodynamics of SystemsPoznań University of Technology, Institute of Applied Mechanics, Division of Vibroacoustics and Biodynamics of Systems This paper describes a computational and experimental investigations of a sound pressure level distribution at the outlet of the spiral duct. A finite element method was used to compute a three-dimensional numerical models in a COMSOL Multiphysics computer application. Both, numerical and experimental models of the spiral duct were placed solidly in a circular duct and they were approximately of the same size with a mandrel placed axially. For experimental investigations of sound pressure distribution, the measurements were carried out in a square plane, about 16 cm per 16 cm, perpendicular to the mandrel’s axis and placed at a distance of 2.5 cm from the outlet of the spiral duct. The nearest surroundings of the outlet of the spiral duct was covered by an absorptive material. As the computational outlet surroundings was set up an empty air volume with a boundary conditions of a characteristic impedance of the air. This gives the same conditions as an anechoic chamber. It is presented that computational model is very similar to experimental one. Specific sound pressure level distribution at the outlet of the spiral duct is presented as computed and measured experimentally. This comparison shows good agreement between experimental and numerical results and it reveals great potential for applications as a newly discovered acoustic band stop filter – the spiral duct. https://acoustics.ippt.pan.pl/index.php/aa/article/view/837spiral ductsound attenuationexperimentnumerical computationsFEM |
| spellingShingle | Wojciech ŁAPKA Czesław CEMPEL Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct Archives of Acoustics spiral duct sound attenuation experiment numerical computations FEM |
| title | Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct |
| title_full | Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct |
| title_fullStr | Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct |
| title_full_unstemmed | Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct |
| title_short | Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct |
| title_sort | computational and experimental investigations of a sound pressure level distribution at the outlet of the spiral duct |
| topic | spiral duct sound attenuation experiment numerical computations FEM |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/837 |
| work_keys_str_mv | AT wojciechłapka computationalandexperimentalinvestigationsofasoundpressureleveldistributionattheoutletofthespiralduct AT czesławcempel computationalandexperimentalinvestigationsofasoundpressureleveldistributionattheoutletofthespiralduct |