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Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics
- Ahsanul Karim - Ford Motor Company ,
- Matthew Mckean - Ford Product Development ,
- Rick Dehner - Ohio State University ,
- Ahmet Selamet - Ohio State University ,
- Chris Tiernan - Ford Motor Company ,
- Anthony Morelli - Ford Powertrain Operations ,
- Keith Miazgowicz - Ford Motor Company ,
- Ted Mull - Ford Motor Company
ISSN: 2641-9637, e-ISSN: 2641-9645
Published June 05, 2019 by SAE International in United States
Citation: Karim, A., Mckean, M., Dehner, R., Selamet, A. et al., "Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics," SAE Int. J. Adv. & Curr. Prac. in Mobility 1(4):1702-1713, 2019, https://doi.org/10.4271/2019-01-1484.
The conventional ported shroud recirculation casing treatment elevates narrowband noise at blade pass frequency. A new ported shroud recirculating casing treatment was implemented in Ford’s 3.5L turbo gas engine as Noise Vibration and Harshness (NVH) counter measure to reduce whoosh (broadband flow noise) noise without elevating narrowband noise at blade pass frequency. The new ported shroud design incorporates holes between the main and secondary recirculating passage and a slight cross-sectional area reduction just upstream of the impeller. These design features reduce whoosh noise without elevating the first order and the sixth order tonal noise at blade pass frequency. The new ported shroud design decreases narrowband tonal noise sound pressure level by 3-6 dB in the low to mid flow region compared to the baseline design. Computational Fluid Dynamics (CFD) tools were used to develop this casing treatment design.