Simulation of Exhaust Gas Residuals in a Turbocharged, Spark Ignition Engine 2013-01-2705
Highly downsized, Direct Injection (DI) engines benefit strongly from cylinder scavenging where possible, to reduce internal residuals thereby reducing the occurrence of knock. Some researchers also suggest that non-homogeneous distribution of internal residuals at high load could contribute to pre-ignition or ‘mega-knock’ with much higher pressure amplitude than that of common knock.
For this reason, a computational study was conducted to assess the residual gas fraction and in-cylinder distribution, using the combustion geometry of the three cylinder, 1.2L MAHLE Downsizing engine, which has proven to be a very robust and reliable research tool into the effects of combustion effects under a number of different operating conditions. This study used a CFD model of the cylinder gas exchange. ES-ICE coupled with STAR-CD was employed for a moving mesh, transient in-cylinder simulation. The boundary conditions were provided by a correlated 1-D (GT-power) model, with several scenarios simulated including engine speed, valve overlap and port geometry. The residual distributions at part load with different inlet ports were also assessed.
Citation: Copeland, C., Gao, X., Freeland, P., Neumeister, J. et al., "Simulation of Exhaust Gas Residuals in a Turbocharged, Spark Ignition Engine," SAE Technical Paper 2013-01-2705, 2013, https://doi.org/10.4271/2013-01-2705. Download Citation
Author(s):
Colin D. Copeland, Xing Gao, Paul A. Freeland, Jens Neumeister, John Mitcalf
Affiliated:
Univ. of Bath, MAHLE Powertrain Ltd.
Pages: 10
Event:
SAE/KSAE 2013 International Powertrains, Fuels & Lubricants Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Downsizing
Combustion and combustion processes
Engine cylinders
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