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A combined design m...
A combined design method for optimal acoustic treatment of annular aeroengine inlet based on cremer impedance
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Xianghai, Q. (författare)
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Lin, D. (författare)
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Xiaodong, J. (författare)
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visa fler...
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- Åbom, Mats, 1954- (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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- Bodén, Hans, 1954- (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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visa färre...
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(creator_code:org_t)
- International Institute of Acoustics and Vibration, IIAV, 2018
- 2018
- Engelska.
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Ingår i: 25th International Congress on Sound and Vibration 2018, ICSV 2018. - : International Institute of Acoustics and Vibration, IIAV. - 9781510868458 ; , s. 1248-1255
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- A combined design method of impedance of acoustic nacelle is developed based on the Cremer impedance. First, the Cremer method is further extended to provide the theoretical optimum impedance for infinite uniform annular ducts in the presence of a single azimuthal mode and plug flow. Then, with the Cremer impedance being the initial value, the searching optimization based on a finite element sound propagation model is conducted to determine the impedance for maximizing noise reduction under the conditions of nearly actual duct geometry and flow. A design case of impedance of a typical aeroengine inlet is used to evaluate the method. The TL contour against impedance indicates that the combined design can avoid the local solution and find successfully the globally optimum impedance, thereby leading to the maximum sound attenuation. Additionally, the Cremer impedance is quite close to the final optimum impedance in this case, thereby providing not only a good initial impedance but also a proper searching space for the search optimization. Therefore, the combined design method is of high efficiency and accuracy.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Acoustic treatment
- Cremer method
- Optimization design
- Optimum impedance
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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