Browse Publications Technical Papers 2017-01-0749

NOx Reduction in Compression-Ignition Engine by Inverted Ignition Phi-Sensitivity 2017-01-0749

A new approach of NOx reduction in the compression-ignition engine is introduced in this work. The previous research has shown that during the combustion stage, the high temperature ignition tends to occur early at the near-stoichiometric region where the combustion temperature is high and majority of NOx is formed; Therefore, it is desirable to burn the leaner region first and then the near-stoichiometric region, which inhibits the temperature rise of the near-stoichiometric region and consequently suppresses the formation of NOx. Such inverted ignition sequence requires mixture with inverted phi-sensitivity. Fuel selection is performed based on the criteria of strong ignition T-sensitivity, negligible negative temperature coefficient (NTC) behavior, and large heat of vaporization (HoV). Based on the suggested criteria, Ethanol (C2H5OH) is selected as the preliminary test fuel for this study. 0-D ignition delay analysis is performed to illustrate the selected fuel’s potential to generate mixture with inverted phi-sensitivity. 3-D engine CFD simulation is conducted with the selected fuel under different engine load conditions. The inverted phi-sensitivity and the inverted ignition sequence are demonstrated to exist in the engine simulation. The NOx reduction by inverted ignition sequence is effective at low and medium load. At high load, the proposed method fails to reduce the NOx emission due to the high overall equivalence ratio.


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:

High Pressure Fuel Injection-A Rational Approach to Diesel Engine Efficiency, Emissions, and Economics


View Details


Application of Computational Fluid Dynamics to Explore the Sources of Soot Formation in a Gasoline Direct Injection Engine


View Details


Fast Burning and Reduced Soot Formation via Ultra-High Pressure Diesel Fuel Injection


View Details