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Designing an acoustic termination with a variable reflection coefficient to investigate the probability of instability of thermo-acoustic systems
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- Saxena, V. (author)
- Department of Mechanical Engineering, Eindhoven University of Technology, Netherlands
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- Kojourimanesh, M. (author)
- Department of Mechanical Engineering, Eindhoven University of Technology, Netherlands
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- Kornilov, V. (author)
- Department of Mechanical Engineering, Eindhoven University of Technology, Netherlands
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- (creator_code:org_t)
- Silesian University Press, 2021
- 2021
- English.
- In: "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. - : Silesian University Press.
- Conference paper (peer-reviewed)
Abstract
Subject headings
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- This paper presents results of the development of an acoustic device to be utilized as a duct termination with variable reflection coefficient. This study is motivated by the idea to experimentally evaluate the probability of instability of a thermo-acoustic system where combustion acts as an active acoustic element, and this termination acts as a passive acoustic element that can be configured to a desired value of the reflection coefficient at the upstream side of the flame and burner for lab-scaled physical modelling of, for instance, domestic boilers. This termination consists of a cylinder containing a stack of truncated hollow cones with narrow gap in between and a telescopic tube. The gap between the adjacent cones, and sound-absorbing fibrous material (“Acotherm”) placed in the cavity of these cones produce a low reflection coefficient in the frequency range between 40 and 800 Hz. Longitudinal displacement of these cones inside the cylinder generates a reflection coefficient with magnitude ranging from 0.2 to 0.9. The telescopic tube with an adjustable length (between 0.85 - 1.38 m) allows to achieve a wide range of phases of reflection coefficient. The steps taken to optimize the design and performance of this termination in presence of flame are presented here.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Passive termination
- Stability
- Variable reflection coefficient
- Acoustic fields
- Acoustic noise
- Acoustic wave absorption
- Cylinders (shapes)
- Acoustic elements
- Acoustic systems
- Hollow cones
- Narrow gap
- Passive acoustics
- Scaled physical model
- Sound-absorbing
- Thermo-acoustics
- Reflection
Publication and Content Type
- ref (subject category)
- kon (subject category)
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