Abstract
In diesel engines having heterogeneous in-cylinder temperature distribution, wall heat loss analyses of spray flame impingement region at the periphery of the piston cavity are necessary to consider the heat loss reduction and thermal efficiency improvement. This study examined a quantitative analysis of the local wall heat loss on spray flame impinged regions by high magnification combustion observation by using a single cylinder heavy-duty diesel engine equipped with top-view optical system. This high magnification and high-speed observation enable to measure the distance from the wall to the stabilized region of natural luminosity of flame which is valuable for quantitative analyses.
