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A combined design method for optimal acoustic treatment of annular aeroengine inlet based on cremer impedance
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0001-7898-8643
Vise andre og tillknytning
2018 (engelsk)Inngår i: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, International Institute of Acoustics and Vibration, IIAV , 2018, Vol. 2, s. 1248-1255Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

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.

sted, utgiver, år, opplag, sider
International Institute of Acoustics and Vibration, IIAV , 2018. Vol. 2, s. 1248-1255
Emneord [en]
Acoustic treatment, Cremer method, Optimization design, Optimum impedance
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-241872Scopus ID: 2-s2.0-85058716055ISBN: 9781510868458 (tryckt)OAI: oai:DiVA.org:kth-241872DiVA, id: diva2:1282732
Konferanse
25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, Hiroshima, Japan, 8 July 2018 through 12 July 2018
Merknad

QC 20190125

Tilgjengelig fra: 2019-01-25 Laget: 2019-01-25 Sist oppdatert: 2019-01-25bibliografisk kontrollert

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Totalt: 38 treff
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