Abstract
Ash formation in post-injection is considered to be caused by the splashing of lubricant oil due to the impingement of the spray on the lubricant oil film. In this paper, the mixing ratio of diesel fuel and lubricating oil in droplets splashed from the oil crown was measured using the laser-induced fluorescence method. By measuring the droplet diameter and the number of droplets, the experimental equation to predict the amount of lubricant dispersed is calculated. As a result, it was shown that the amount of lubricant splashed from the oil crown decreased as the K-factor increased, and the amount of lubricant splashed increased as the non-dimensional film thickness 𝛿𝑛𝑜𝑛 increased.
