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Turbocharger Noise - Generation and Control
Technical Paper
2014-36-0802
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An important part of modern engine design is the concept of downsizing where a key role is carried by the charging devices. These devices are effective aero-acoustic sources forming a coupled acoustic system with the connected flow-channel components. At KTH a unique test facility for determination of the complete acoustic Two-port for turbochargers has been built. Using this facility both the passive (transmission & reflection) as well as the active (sound generation) data for turbochargers can be measured at a given operating point. One important issue which has been studied in detail using this data is the coupling between the aerodynamic and acoustic fields close to “surge”. In addition, the control of compressor noise is an increasing concern. For instance heavy duty diesels and light duty engines with screw (roots) compressors can create strong charging harmonics well below 10 kHz. The standard noise control solution for these cases is to build a series of resonators. As an alternative KTH has developed a novel compact and very efficient silencer in the form of an expansion chamber with locally reacting cavities. The cavities consists of a micro-perforated plate in front of a closed air volume. The micro-perforate and volume are then chosen so that the cavity impedance equals the so called Cremer impedance at a target frequency. This ensures a very high damping at one frequency (hundreds of dB/m) and using this concept compact silencers with a damping higher than 30 dB in octave around the target frequency can be designed.
Authors
Citation
Åbom, M. and Kabral, R., "Turbocharger Noise - Generation and Control," SAE Technical Paper 2014-36-0802, 2014, https://doi.org/10.4271/2014-36-0802.Also In
References
- www.ccgex.kth.se
- Regulation (EC) No 715/2007 On type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information Official Journal of the European Union L171 2007
- Rämmal , H. and Åbom , M. Acoustics of Turbochargers SAE Technical Paper Series , 2007-01-2205 2007 10.4271/2007-01-2205
- Knipstein , D. Soundabsorbing element and procedure for manufacture of this element and use of this element European Patent No. EP0876539 23 01 1997
- Rämmal , H. and Åbom , M. Testrig for Characterization of Turbo-compressor Acoustic Properties presented in 14 th AIAA/CEAS Aeroacoustics Conference , AIAA 2008-2959
- Tiikoja , H. , Rämmal , H. , Åbom , M. , Bodén , H. Test-Rig for Complete Acoustic Characterization of Turbochargers presented in 16th AIAA/CEAS Aeroacoustics Conference , AIAA 2010-4012
- Kabral , R. , Rammal , H. , Abom , M. Acoustical Methods for Investigating Turbocharger Flow Instabilities SAE Technical Paper Series , 2013-01-1879 2013 10.4271/2013-01-1879
- Åbom , M. Acoustic multi-ports with application to duct acoustics Distinguished Keynote paper. ICSV 17 Cairo 18 22 July 2010
- Auregan , Y. , Starobinski R. Determination of acoustical dissipation/production potentiality from the acoustical transfer function of a multiport Acta Acustica 85 1999 788 792
- Allam , S. , Åbom , M. A New Type of Muffler Based on Microperforated Tubes Journal of Vibration and Acoustics 133 03 1005 2011 10.1115/1.4002956
- Åbom , M. , Allam , S. Dissipative Silencers Based on Micro-Perforated Plates SAE Technical Paper Series , 2013-24-0071 2013 10.4271/2013-24-0071
- Kabral , R. , Du , L. , Åbom , M. , and Knutsson , M. A Compact Silencer for the Control of Compressor Noise SAE Int. J. Engines 7 3 1572 1578 2014 10.4271/2014-01-2060
- Tester , B. J. The propagation and attenuation of sound in lined ducts containing uniform or “plug” flow Journal of Sound and Vibration 1973 28 2 151 203
- Kabral , R. , Auriemma , F. , Knutsson , M. , Åbom , M. A New Type of Compact Silencer for High Frequency Noise Online Proceedings of the 9th International DAAAM Baltic Conference 24 26 Apr 2014 Tallinn 2346-6138