Numerical Investigation of Advanced Compressor Technologies to Meet Future Diesel Emission Regulations

2009-01-1469

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
The response to increasingly stringent light duty diesel emission regulation is a nearly unanimous increase in heavy Exhaust Gas Recirculation (EGR) application to reduce feedgas NOx emissions. Little attention has been paid to the fact that heavy EGR usage is likely to push the engine operating conditions towards less efficient or even unstable regions of conventional centrifugal compressor operating maps. Moreover, the low oxygen content at part load operation also poses transient response challenges. Therefore, improving turbocharger efficiency at part load and extending the stable operating range is becoming critical for viable future low emission diesel engines. In this study of a turbocharger compression system, encompassing the airflow geometry from compressor impeller inlet to volute exit, a dual volute compressor concept was introduced, and Computational Fluid Dynamics (CFD) was used to investigate its effects on the overall expected performance level and range. The numerical investigation revealed that the dual volute design could separate the compressor into two operating regions: “high efficiency” and “low efficiency” regions with different air flow characteristics, and treating these two regions separately with dual diffuser design showed extended stable operating range and improved efficiency by comparing with conventional single volute design.
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DOI
https://doi.org/10.4271/2009-01-1469
Pages
9
Citation
Jiao, K., Li, X., Sun, H., Schram, T. et al., "Numerical Investigation of Advanced Compressor Technologies to Meet Future Diesel Emission Regulations," SAE Technical Paper 2009-01-1469, 2009, https://doi.org/10.4271/2009-01-1469.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1469
Content Type
Technical Paper
Language
English