Acoustic Modeling of Charge Air Coolers

[+] Author and Article Information
Magnus Knutsson

Noise & Vibration Centre, Volvo Car Group Dept 91620/PV2C2, SE-405 31 Göteborg, Sweden

Mats Abom

KTH-CCGEx, The Marcus Wallenberg Laboratory for Sound and Vibration Research KTH-Royal Institute of Technology, SE-100 44 Stockholm, Sweden

1Corresponding author.

ASME doi:10.1115/1.4036276 History: Received October 16, 2016; Revised February 22, 2017


The necessity of reducing CO2 emissions has lead to an increased number of passenger cars that utilizes turbo charging to maintain performance when the IC-engines are downsized. Charge air coolers are used on turbocharged engines to enhance the overall gas exchange efficiency. Cooling of charged air increases the air density and thus the volumetric efficiency and also increases the knock margin (for petrol engines). The acoustic properties of charge coolers have so far not been extensively treated in the literature. Since it is a large component with narrow flow passages it includes major resistive as well as reactive properties. Therefore it has the potential to largely affect the sound transmission in air intake systems and should be accurately considered in the gas exchange optimization process. In this paper a frequency domain acoustic model of a charge air cooler for a passenger car is presented. The cooler consists of two conical volumes connected by a matrix of narrow ducts where the cooling of the air takes place. A recently developed model for sound propagation in narrow ducts that takes into account the attenuation due to thermoviscous boundary layers and interaction with turbulence is combined with a multiport representation of the tanks to obtain an acoustic two-port representation where flow is considered. The predictions are compared with experimental data taken at room temperature and show good agreement. Sound transmission loss increasing from 5 to over 10 dB in the range 50-1600 Hz is demonstrated implying good noise control potential.

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