Abstract
Rapid mixing of fuel and air is an essential factor in improving combustion and emissions of diesel engines. The paper investigates local diffusion phenomena with focusing on scales of fuel cloud and eddies. To analyze degree of heterogeneity entropic analysis was developed and applied to the diffusion phenomena in turbulent jets and diesel sprays. The result shows the effectiveness of the entropic analysis method for identification of scales of heterogeneity and diffusion intensity. The result of the experiment shows that the diffusion intensity is the highest at the vicinity of the nozzle exit, and size scale of the heterogeneity is the smallest. The scale of the heterogeneity increases gradually along the spray axis towards downstream, with containing smaller scales inside of the large clouds. In the downstream region, small-scale structure diffuses and becomes unclear, while large scale structure remains clearly. The paper reveals microscopic structure of the heterogeneity in diesel sprays, and it demonstrates availability of the entropic method.
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