Study on flame propagation characteristics according to new ignition-source in a constant volume combustion chamber

This study has the purpose to consider a new ignition source in order to increase the inflammable limit of a gasoline engine at its lean region. To analyze flame propagation characteristics, a CVCC (constant volume combustion chamber) was produced, and three types of devices – conventional type, arc type, and jet type – were manufactured to conduct combustion testing. Experimental variables were the air/fuel ratio from 1.0 to 1.8 and charging pressure from 2 bar to 4 bar. The result of flame propagation analysis showed that the spread for jet type was faster than that of conventional type by 10 ms, and that of arc type by 5 ms. Result of combustion pressure experiment showed that, at air/fuel ratio of 1.0, arc type showed the highest value, with 22 bar, while jet type showed 19.4 bar and convention type was 17 bar. At maximum inflammable limit experiment, combustion was possible at jet type and arc type in an area above an air/fuel ratio of 1.8, but the conventional type showed miss fire, where combustion did not occur in the area above 1.6. The Study on new ignition source concluded that the jet type shows superior results in terms of combustion speed while the arc type is excellent in terms of combustion pressure. © 2019 Trans Tech Publications, Switzerland