A Study on Efficiency and Emission Enhancements in a 4-Stroke Natural Gas Lean Burn Engine

Paper #:
  • 960849

Published:
  • 1996-02-01
Citation:
Kim, S., Kim, C., Kim, C., Pang, H. et al., "A Study on Efficiency and Emission Enhancements in a 4-Stroke Natural Gas Lean Burn Engine," SAE Technical Paper 960849, 1996, https://doi.org/10.4271/960849.
Pages:
15
Abstract:
Experiments were performed with a 4-stroke, natural gas fueled SI engine to investigate the effects of several parameters on engine performance under lean operating condition. A favorable effect of charge swirl on stable lean burn operation was observed at a conventional compression ratio. There was an optimum EGR rate which gave a substantial reduction in NOx emissions with minor penalties in efficiency and UHC emissions. Marginal improvement was noticed with lean operations in a long spark duration ignition system. The flame jet ignition system displayed noticeable capability in extending the lean limit. In addition, shadowgraph visualization tests were performed for combustion diagnostic purposes.
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