Performance and NOx Emissions Modeling of a Jet Ignition Prechamber Stratified Charge Engine 760161
The development of a cycle simulation model for the jet ignition prechamber stratified charge engine is described. Given the engine geometry, load, speed, air-fuel ratios and pressures and temperatures in the two intakes, flow ratio and a suitable combustion model, the cycle simulation predicts engine indicated efficiency and NO emissions. The relative importance of the parameters required to define the combustion model are then determined, and values for ignition delay and burn angle are obtained by matching predicted and measured pressure-time curves. The variation in combustion parameters with engine operating variables is then examined. Predicted and measured NO emissions are compared, and found to be in reasonable agreement over a wide range of engine operation. The relative contribution of the prechamber NO to total exhaust NO is then examined, and in the absence of EGR, found to be the major source of NO for overall air-fuel ratios leaner than 22:1.
Citation: Hires, S., Ekchian, A., Heywood, J., Tabaczynski, R. et al., "Performance and NOx Emissions Modeling of a Jet Ignition Prechamber Stratified Charge Engine," SAE Technical Paper 760161, 1976, https://doi.org/10.4271/760161. Download Citation
Author(s):
S. D. Hires, A. Ekchian, John B. Heywood, R. J. Tabaczynski, J. C. Wall
Affiliated:
Massachusetts Institute of Technology
Pages: 28
Event:
1976 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Stratified charge engines
Air / fuel ratio
Combustion and combustion processes
Nitrogen oxides
Simulation and modeling
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »