Browse Publications Technical Papers 2007-01-0942

Phenomenological Modeling of Low-Temperature Advanced Low Pilot-Ignited Natural Gas Combustion 2007-01-0942

Recently [1, 2, 3 and 4], the novel Advanced (injection) Low Pilot-Ignited Natural Gas (ALPING) low-temperature combustion (LTC) concept was demonstrated to yield very low NOx emissions (<0.2 g/kWh) with high fuel conversion efficiencies (>40%). In the ALPING-LTC concept, very small diesel pilot sprays (contributing ∼2-3 percent of total fuel energy) are injected early in the compression stroke (60°BTDC) to ignite lean, homogeneous natural gas-air mixtures. To simulate ALPING-LTC, a phenomenological thermodynamic model was developed. The cylinder contents were divided into an unburned zone containing fresh natural gas-air mixture, several packets containing diesel and entrained natural gas-air mixture, a flame zone, and a burned zone. The simulation explicitly accounted for pilot injection, spray entrainment, diesel ignition (with the Shell autoignition model), spray combustion of diesel and entrained natural gas, and premixed turbulent combustion of the natural gas-air mixture. After a brief validation of the model, parametric studies were performed at different intake manifold temperatures, natural gas equivalence ratios, pilot injection quantities, and injection pressures. From these studies, the profound influence of packet (spray) combustion on the overall premixed turbulent (flame) combustion was identified. The method of flame area computation based on packet volumes provided the direct link between these two combustion processes.


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


Members save up to 16% 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:

The Effect of Exhaust Throttling on HCCI - Alternative Way to Control EGR and In-Cylinder Flow


View Details


New Control Strategies to Avoid Pre-Ignition in Higher CR Engines


View Details


Cylinder-to-Cylinder Variations in Power Production in a Dual Fuel Internal Combustion Engine Leveraging Late Intake Valve Closings


View Details