This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Air Induction Impact on Turbocharger Noise and Thermodynamic Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The trend to simultaneously improve fuel economy and engine performance has led to industry growth of turbocharged engines and as a result, the need to address their undesirable airborne noise attributes. This presents some unique engineering challenges as higher customer expectations for Noise Vibration Harshness (NVH), and other vehicle-level attributes increase over time. Turbocharged engines possess higher frequency noise content compared to naturally aspirated engines. Therefore, as an outcome, whoosh noise in the Air Induction System (AIS) during tip in conditions is an undesirable attribute that requires high frequency attenuation enablers. The traditional method for attenuation of this type of noise has been to use resonators which adds cost, weight and requires packaging space that is often at a premium in the under-hood environment. By improving our understanding of the root cause, we aim to develop AIS design strategies that can prevent unwanted noise from being generated at the source, while avoiding the need for traditional noise attenuation solutions. Additionally, a better understanding of any implication on compressor performance in terms of isentropic efficiency and pressure ratio will be investigated as a result of the noise being generated. A range of pipe configurations were designed to achieve specific swirl and flow uniformity metrics using inflow swirl devices and 90o bends. Initial assessments were obtained from a gas stand and then verified during vehicle level testing on a gasoline turbocharged 2.0L vehicle. Acoustic and thermodynamic gas stand characterizations were completed for 80 operating points for a set of defined configurations. Particle Image Velocimetry (PIV) was used to map inlet flow conditions into the compressor. The outcome of the investigation has shown how specific flow conditions have degraded compressor efficiency up to ~2.6% and increased noise levels up to ~15 dB (A) at the compressor inlet.
CitationSaeed, S., Butler, B., Likich, M., Orzechowski, J. et al., "Air Induction Impact on Turbocharger Noise and Thermodynamic Performance," SAE Technical Paper 2020-01-0426, 2020, https://doi.org/10.4271/2020-01-0426.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
- Rammal, H. and Abom, M. , “Acoustics of Turbochargers,” SAE Technical Paper 2007-01-2205, 2007, doi:https://doi.org/10.4271/2007-01-2205.
- Figurella, N., Dehner, R., and Selamet, A. , “Effect of Inlet Guide Vanes on Centrifugal Compressor Acoustics,” INCE, 6, 2014.
- Figurella, N., Dehner, R., Selamet, A., Miazgowicz, K. et al. , “Effect of Aerodynamically Induced Pre-Swirl on Centrifugal Compressor,” SAE International 8, 2015.
- Teng, C. and Homco, S. , “Investigation of Compressor Whoosh Noise,” SAE International 7, 2009.
- Hulse, B., Pearson, C., Abbona, M. and Andersson, A. , “Some Effects of Blade Characteristics on Compressor Noise Level,” The Boeing Company Commercial Airplane Division, Renton, 1966.
- Hanig, U. , “Intake Throttle and Pre-Swirl Device for Low-Pressure EGR Systems,” 2015, [Online], available at https://www.borgwarner.com/docs/default-source/default-document-library/2015_whitepaper_intake-throttle-and-pre-swirl-device-for-lp-egr-systems_en.pdf?sfvrsn=6e0bcd3c_12.