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Modeling of the aco...
Modeling of the acoustical field due to a jet engine with ground effect
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- Mihaescu, Mihai (författare)
- Lund University,Lunds universitet,Strömningsteknik,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Fluid Mechanics,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH
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- Szász, Robert-Zoltán (författare)
- Lund University,Lunds universitet,Strömningsteknik,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Fluid Mechanics,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH
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- Fuchs, Laszlo (författare)
- Lund University,Lunds universitet,Strömningsteknik,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Fluid Mechanics,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Proceedings of the Tenth International Congress on Sound and Vibration. ; , s. 677-684
- Relaterad länk:
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https://lup.lub.lu.s...
Abstract
Ämnesord
Stäng
- The principal noise source for a jet engine is associated with the jet exhaust. The acoustical field that is generated by a jet engine before the take-off is considered. The turbulent jet and the mixing of the hot exhaust gas with the cold surrounding air forms an acoustical source. The compressible Navier-Stokes equations describe both flow field as well as sound generation. The acoustic theory uses the hypothesis that a part of the flow field (which is the source of the acoustic field) is distinct from the properties of the ambient flow field. Thus, the velocity vector, the pressure and the density are split into semi-compressible components and inviscid, irrotational acoustical components. The turbulent flow and mixing are computed by using Large Eddy Simulation (LES). The instantaneous LES provide the acoustical source for the Lighthill's wave equation, which is used to compute the acoustical field. The computed acoustical field agrees quite well with published experimental data.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Sound radiation
- Lighthill's wave equations
- Turbulent jets
- Large Eddy Simulation (LES)
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)