G0700703 Ignition Characteristics of Dome Flanged Spark Plug in Natural Gas Engine

Abstract

CO_2 in exhaust gas from automobile is brought about global warming. In a spark ignition engine, lean combustion brings high thermal efficiency. It becomes difficult to ignite successfully on the other hand. There is a risk of shortening the longevity of the igniter though in it, there is a method of increasing the spark energy as measures. In the study, we proposed the spark plug that installed the flange of dome shaped as the risk measures. This spark plug has aimed at the collection of the shock wave energy generated at the spark discharge and the control of the flow around the spark discharge path. We made dome flanged spark plugs of 3 types. The effect of dome flanged spark plug on the ignition probability using a single cylinder natural gas engine was examined. As a result, it has been understood that the dome flanged spark plug with three holes was effective for the ignition characteristics for wide range of engine speed. (162 words)