The Effect of Varying the Injected Charge Stoichiometry in a Partially Stratified Charge Natural Gas Engine 2005-01-0247
Ultra lean-burn natural gas engines offer the potential for lower emissions and higher efficiency than conventional SI engines. Combustion instabilities near the lean limit can be addressed by partially stratifying the in-cylinder charge. The Partially Stratified Charge (PSC) approach involves micro-direct-injection of pure fuel, or a fuel-air mixture, to create a rich zone in the region of the spark-plug. This has been demonstrated to improve combustion in an ultra-lean bulk mixture. An experimental premixing apparatus was devised to investigate the effect of changing the stoichiometry of the micro-direct-injected charge. In conjunction, a numerical methodology was used as an aid to understanding the complex in-cylinder processes. Although rich premixed micro-injection improved engine performance over the homogeneous case, the fastest heat release rate was found to occur with a pure fuel PSC charge.
Citation: Reynolds, C., Evans, R., Andreassi, L., Cordiner, S. et al., "The Effect of Varying the Injected Charge Stoichiometry in a Partially Stratified Charge Natural Gas Engine," SAE Technical Paper 2005-01-0247, 2005, https://doi.org/10.4271/2005-01-0247. Download Citation
C.C.O. Reynolds, R.L. Evans, L. Andreassi, S. Cordiner, V. Mulone
University of British Columbia, Vancouver, Canada, Università di Roma “Tor Vergata”, Rome, Italy
SAE 2005 World Congress & Exhibition
SI Combustion and Direct Injection SI Engine Technology-SP-1972