4813 L2F測定およびKIVA-3に基づく噴霧分裂モデルの検証(S54-1 スプレーダイナミックス-計測とモデリング-(1),S54 スプレーダイナミックス-計測とモデリング-)

抄録

The atomization of diesel fuel injected intermittently into the atmosphere was measured using a laser 2-focus velocimeter (L2F). The micro-scale probe nature of the L2F makes it possible to measure simultaneously the velocity and size of droplets. Measurements were taken at 10 and 30mm down the nozzle orifice and the result was compared with the result of KIVA-3 analysis which uses the ETAB model as droplet breakup model. It is confirmed that probability density distributions of velocity and size could be simulated accurately by adopting suitable parent-product droplet size ratio. As a result, it is clarified that unstable droplets in the region of stripping breakup still exist near the nozzle orifice, also, droplet breakup is dominated by bag breakup at 30mm down the nozzle exit.