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Prediction of the o...
Prediction of the onset of sound amplification at shear layers using linear stability analysis
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Karlsson, Mikael (author)
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Weng, Chenyang (author)
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- Majal, Ghulam Mustafa (author)
- KTH,Farkost och flyg
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Knutsson, Magnus (author)
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(creator_code:org_t)
- 2019-05-18
- 2019
- English.
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In: 25th AIAA/CEAS Aeroacoustics Conference, 2019. - Reston, Virginia : American Institute of Aeronautics and Astronautics Inc, AIAA.
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.2...
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Abstract
Subject headings
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- A simple numerical technique for predicting the potentiality of sound amplification by shear layers is presented. The technique applies Howe’s energy corollary to describe the energy exchange between the vortical mode in the shear layer and the acoustic wave incident on the layer. Potential sound amplification by the vortical mode is identified when the net energy gain of the incident acoustic wave is positive. The technique only requires steady flow simulation and linear stability analysis so the computational cost is modest. Numerical results are compared with a measurement on a particle agglomeration pipe and it shows that the sound amplification can be satisfactorily predicted by the simple technique.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Acoustic waves
- Aeroacoustics
- Linear stability analysis
- Shear flow
- A-particles
- Computational costs
- Energy exchanges
- Net energy gains
- Numerical results
- Numerical techniques
- Sound amplification
- Vortical modes
- Amplification
Publication and Content Type
- ref (subject category)
- kon (subject category)
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