抄録
Quick mixing of fuel and air is one of the most essential factors to improve combustion and emissions in diesel engines. The paper investigates local diffusion phenomena in a wall impinging jet with focusing on scales of the heterogeneity. Analysis was made with entropic concept proposed in the previous paper; it analyses homogeneity degree and scales of the heterogeneity in a picture. The result of the entropy analysis shows that the heterogeneity scale increases gradually along the spray axis towards downstream, with containing smaller scales inside of the larger clouds. Such structural development is similar to a free jet, and no obvious difference in the diffusion intensity was observed between free and wall-impinging jets.
