4737 乱流中へのスリットインジェクタによる間欠噴霧のLES解析(S55-2 エンジン現象解析-基礎計測と数値計算-(2),S55 エンジン現象解析-基礎計測と数値計算-)

概要

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Spray injection to turbulent duct flows was investigated by the combination of Large Eddy Simulation (LES) and Lagrangian Discrete Droplet Method (DDM). In this study we assume droplets are injected from a slit injector. This type of injector is used in some direct injection gasoline engines. Turbulence is generated by putting three cylinders in the duct. LES can resolve eddies induced by the momentum of the spray itself. As a result spray inner structures or irregular distribution of droplets were calculated. Conventional Reynolds Averaged Navier-Stokes (RANS) simulations can not treat such structures or irregularity, because all the effect of the turbulence are averaged. But these phenomena are important to enable stable stratified combustion under wide operating conditions in developing direct injection gasoline engines.
2006-09-15