216301 間欠噴霧の数値解析におけるDynamic SGSモデルの適用(一般05 流体力学・流体工学4)

概要

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An intermittent spray is frequently used for the fuel injection into an engine or spray painting. Droplets are distributed ununiformly in a spray. In this study, one-shot injection of a diesel like spray is analyzed. A diesel spray is the unnsteady phenomena, Large-Eddy Simulation (LES) is suitable method to analyze the sprya phenomena. Standard Smagorinsky model (SSM) and Dynamic Smagorinsky model (DSM) are employed for Subgrid-scale (SGS) modeling. However, local flow structure in the spray is varies with location, it is expected that SSM is a low repeatable precision in it. On the other hand, DSM is advantageous because it can respond to changes in loacal flow structures. We executed SSM and computation to compare both models, and compared the calculation results with an experiment in terms of the spray tip penetration and the vortical structure. In consequence, we obtained that DSM is better suited for representation of spray inhomogeneous distribution.
一般社団法人日本機械学会の論文
2011-03-17