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Turbocharger Aeroacoustics and Optimal Damping of Sound
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
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: urn:nbn:se:kth:diva-207151ISBN: 978-91-7729-442-9 (print)OAI: oai:DiVA.org:kth-207151DiVA: diva2:1096314
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
List of papers
1. Investigation of turbocharger compressor surge inception by means of an acoustic two-port model
Open this publication in new window or tab >>Investigation of turbocharger compressor surge inception by means of an acoustic two-port model
(English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568Article in journal (Other academic) Submitted
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-207148 (URN)
Note

QC 20170522

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-22Bibliographically approved
2. Experimental acoustic characterization of automotive twin-scroll turbine
Open this publication in new window or tab >>Experimental acoustic characterization of automotive twin-scroll turbine
Show others...
2017 (English)In: 12th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2017, KTH Royal Institute of Technology, 2017Conference paper, Published paper (Other academic)
Abstract [en]

The present paper focuses on the experimental determination of automotive twin-scroll turbine acoustic performance. The unique test-rig for automotive turbocharger acoustics at KTH CCGEx laboratory is further developed to enable testing of modern twin-scroll turbines under controlled laboratory conditions. It is shown how the passive acoustic properties of such turbines can be accurately characterized by means of an acoustic three-port formulation. Governing equations along with the new test-rig design are presented and discussed in detail. Furthermore, complementary results from the first experimental determination of twin-scroll turbine acoustic three-port data are presented.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-207150 (URN)2-s2.0-85021810533 (Scopus ID)
Conference
12th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2017, Quality Hotel Globe, Stockholm, Sweden, 3 April 2017 through 7 April 2017
Note

QC 20170522

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-08-16Bibliographically approved
3. A compact silencer for the control of compressor noise
Open this publication in new window or tab >>A compact silencer for the control of compressor noise
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
Keyword
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:nbn:se:kth:diva-176208 (URN)10.4271/2014-01-2060 (DOI)2-s2.0-84929077315 (Scopus ID)
Note

QC 20151123

Available from: 2015-11-23 Created: 2015-11-02 Last updated: 2017-05-17Bibliographically approved
4. Optimum Sound Attenuation in Flow Ducts Based on the "Exact" Cremer Impedance
Open this publication in new window or tab >>Optimum Sound Attenuation in Flow Ducts Based on the "Exact" Cremer Impedance
2016 (English)In: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 102, no 5, 851-860 p.Article in journal (Refereed) Published
Abstract [en]

The Cremer impedance (Acustica 3, 1953) [1] is the locally reacting boundary condition that maximizes the attenuation of a certain mode in a uniform wave guide taken as the lowest order mode or "plane" wave. This paper presents the analysis of the "exact" Cremer impedance model, i.e., the high frequency asymptotic results proposed by Tester for uniform mean flow (JSV 28(2), 1973) [2] are extended to lower frequencies. It is shown that significantly larger attenuation per unit length can be obtained using the exact instead of the asymptotic solution. However, for sufficiently low frequencies the "exact" Cremer solution and optimum attenuation is requiring a wall impedance with a negative real part, i.e. an active boundary. In addition, the effect of a finite length on the resulting attenuation is studied using a finite element method for solving the convected wave equation. Finally, it is demonstrated how a silencer can be built that realize the optimum Cremer impedance at a given frequency by using a micro-perforated panel and locally reacting cavities. The performance of the optimized silencer is determined experimentally and the results are compared to the prediction of the finite element model.

Place, publisher, year, edition, pages
S HIRZEL VERLAG, 2016
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-193815 (URN)10.3813/AAA.918999 (DOI)000383241200008 ()2-s2.0-84987835325 (Scopus ID)
Note

QC 20161024

Available from: 2016-10-24 Created: 2016-10-11 Last updated: 2017-05-17Bibliographically approved

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