Extending the Lean Limit Operation of an SI Engine with a Multiple Electrode Spark Plug 830476
The objective of this paper is to study the lean limit operation of a spark ignited internal combustion engine. The aim is to reduce the combustion duration and cyclic variation in lean mixtures; both of which are sensitive to the initial stage of combustion. This work involves increasing the burning rate in lean mixtures by minimizing the ignition delay through the use of a multiple electrode spark plug that has a total gap length of 10.2 mm.
The multiple electrode spark plug was tested on a single cylinder engine and its performance was compared with a conventional spark plug in the following areas: lean limit air-to-fuel ratio; CO, HC, and NO emissions: cyclic variations; and combustion duration.
Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, Alternative Fuels Laboratory, Mechanical Engineering, University of British Columbia, Vancouver, British Columbia, CanadaPresently, Department of Mechanical Engineering, University of California, Berkeley, CA