Abstract
Using a laser, as opposed to a conventional (electrical) spark plug, to create combustion initiating spark is potentially advantageous for several reasons: flexibility in choosing and optimizing the spark location, in particular, to move the spark away from solid heat sinks; production of a more robust spark containing more energy; and obviation of electrode erosion problems. These advantages may lead to an extension of the lean limit, an increase in engine thermal efficiency, and the concomitant benefits of reduced pollutant emissions. Presented in this paper is the design and implementation of a laser ignition system appropriate for a large bore natural gas engine. Design considerations include optimization of spark location, design of beam delivery system and optical plug, and mitigation of vibration and thermal effects. A single cylinder of a four-cylinder large bore natural gas engine is operated using laser ignition. Four different laser spark locations are examined. Comparisons are made between laser spark and conventional spark plug ignition.
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