Browse Publications Technical Papers 2013-24-0029

Numerical Investigation of Combustion in a Lean Burn Gasoline Engine 2013-24-0029

This research effort focuses on lean-burn combustion in gasoline internal combustion engines. Gasoline is largely known to be characterized by narrow flammability range, which makes the use of ultra-lean mixtures very challenging. In order to fully explore the gasoline lean burn potential, a promising strategy should combine advanced intake geometries, injection strategies, and ignition technologies.
In this paper, a CFD methodology is developed in order to provide proper insight into lean-burn gasoline combustion. A baseline homogenous/lean case is analyzed and numerical results are validated against engine data.
Two critical issues are addressed. First, a relatively large detailed mechanism is validated against the experimental data for extreme operating conditions (low pressure values, lean mixtures). The large cycle-to-cycle variation characterizing lean combustion is shown experimentally. An advanced numerical approach is proposed that delivers oscillation in the CFD results as an effect of the reduced numerical diffusion. The results indicate that the CFD methodology presented in this paper has a potential in describing the average behavior of the engine while future work will address cycle-to-cycle variation and combustion stability.
Secondly, the effect of the intake geometry on the in-cylinder flow and flame propagation is shown. Numerical simulations are able to highlight combustion features that are of primary importance for future engine optimization.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Continuous Variable Tumble - A New Concept for Future Lean Burn Engines


View Details


Combustion by Pulsed Jet Plumes - Key to Controlled Combustion Engines


View Details


Combustion Enhancement of Very Lean Premixture Part in Stratified Charge Conditions


View Details