Ignition Delay Correlation for Engine Operating with Lean and with Rich Fuel-Air Mixtures
Author(s)
McKenzie, Jacob Elijah; Cheng, Wai K
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An ignition delay correlation encompassing the effects of temperature, pressure, residual gas, EGR, and lambda (on both the rich and lean sides) has been developed. The procedure uses the individual knocking cycle data from a boosted direct injection SI engine (GM LNF) operating at 1250 to 2000 rpm, 8-14 bar GIMEP, EGR of 0 to 12.5%, and lambda of 0.8 to 1.3 with a certification fuel (Haltermann 437, with RON=96.6 and MON=88.5). An algorithm has been devised to identify the knock point on individual pressure traces so that the large data set (of some thirty three thousand cycles) could be processed automatically. For lean and for rich operations, the role of the excess fuel, air, and recycled gas (which has excess air in the lean case, and hydrogen and carbon monoxide in the rich case) may be treated effectively as diluents in the ignition delay expression.
Date issued
2016-04Department
Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
SAE Technical Papers
Publisher
SAE International
Citation
McKenzie, Jacob, and Wai K. Cheng. “Ignition Delay Correlation for Engine Operating with Lean and with Rich Fuel-Air Mixtures.” N.p., 2016.
Version: Author's final manuscript
ISSN
0148-7191