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A compact silencer for the control of compressor noise
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7898-8643
2014 (English)In: SAE International Journal of Engines, ISSN 1946-3936, Vol. 7, no 3, 1572-1578 p.Article in journal (Refereed) Published
Abstract [en]

Current trends for IC-engines are driving the development of more efficient engines with higher specific power. This is true for both light and heavy duty vehicles and has led to an increased use of super-charging. The super-charging can be both in the form of a single or multi-stage turbo-charger driven by exhaust gases, or via a directly driven compressor. In both cases a possible noise problem can be a strong Blade Passing Frequency (BPF) typically in the kHz range and above the plane wave range. In this paper a novel type of compact dissipative silencer developed especially to handle this type of problem is described and optimized. The silencer is based on a combination of a micro-perforated (MPP) tube backed by a locally reacting cavity. The combined impedance of micro-perforate and cavity is chosen to match the theoretical optimum known as the Cremer impedance at the mid-frequency in the frequency range of interest. Due to the high damping achieved at the Cremer optimum (hundreds of dB/m) it is easy to create a compact silencer with a significant damping (say > 30 dB) in a range larger than an octave. Both simulations and experimental tests of the novel silencer are presented based on a light duty vehicle application.

Place, publisher, year, edition, pages
SAE International , 2014. Vol. 7, no 3, 1572-1578 p.
Keyword [en]
Airships, Damping, Engines, Internal combustion engines, Noise pollution, Research aircraft, Blade passing frequency, Compressor noise, Directly-driven, Experimental test, Frequency ranges, Heavy duty vehicles, Light duty vehicles, Mid-frequencies, Exhaust gases
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-176208DOI: 10.4271/2014-01-2060Scopus ID: 2-s2.0-84929077315OAI: oai:DiVA.org:kth-176208DiVA: diva2:873114
Note

QC 20151123

Available from: 2015-11-23 Created: 2015-11-02 Last updated: 2017-05-17Bibliographically approved
In thesis
1. Turbocharger Aeroacoustics and Optimal Damping of Sound
Open this publication in new window or tab >>Turbocharger Aeroacoustics and Optimal Damping of Sound
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 79 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:36
National Category
Fluid Mechanics and Acoustics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-207151 (URN)978-91-7729-442-9 (ISBN)
Public defence
2017-06-09, sal E3, Osquars backe 14, KTH-Campus, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20170517

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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