Low frequency damping from turbulence with application to charge air coolers
2012 (English)In: Int. Congr. Expos. Noise Control Eng., INTER-NOISE, 2012, 9424-9433 p.Conference paper (Refereed)
As a consequence of its contribution to the global warming the necessity of reducing the CO2 emissions from transportation is dramatically increasing. One effective measure to meet this requirement with respect to the passenger car segment is to conduct IC-engine downsizing. To meet requirements for high power and torque output turbo- or supercharging in combination with charge air cooling is regularly used. Both compressors and charge air coolers will largely influence the sound transmission though the air intake system. In order to make a proper system optimization where pressure drop, heat exchange efficiency and acoustics are balanced within a given space accurate models are required. Inside most charge air coolers the cooling takes place in parallel narrow channels where boundary layers dominate the behavior. This paper presents a new acoustic model for charge air coolers where low frequency damping from interaction between acoustic boundary layers and turbulence is important. The predictions are compared with experimental data taken at room temperature and show good agreement. More than 5 dB transmission loss is demonstrated at low frequencies that can be used for noise control.
Place, publisher, year, edition, pages
2012. 9424-9433 p.
, 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012, 11
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-129694ScopusID: 2-s2.0-84883566993ISBN: 9781627485609OAI: oai:DiVA.org:kth-129694DiVA: diva2:653501
41st International Congress and Exposition on Noise Control Engineering 2012
QC 201310042013-10-042013-10-032013-10-04Bibliographically approved