オイラー・ラグランジュ法を用いたクロスフロー型液体噴流の微粒化・蒸発に関する数値解析

This study investigates the atomization and evaporation process of liquid fuel jets in crossflow by considering the evaporation from not only Lagrangian droplets but also the liquid column and Eulerian droplets which are generated from the primary breakup of the column. The evaporations from the liquid column and Eulerian droplets are calculated using the heat and mass transfer model, while the evaporation of Lagrangian droplets is calculated by a non-equilibrium Langmuir-Knudsen model. The results show that the evaporation occurs actively at the gas-liquid interface of the liquid column tip and droplets torn from the jet. In addition, in comparison to the evaporation of Lagrangian droplets, the Eulerian part of the evaporation is marked. Moreover, regarding fuel vapor distributions on a downstream plane, fuel vapor from the gas-liquid interface is greatly influenced by the liquid column trajectory and is distributed mostly at the same height as the column tip. In contrast, fuel vapor from Lagrangian droplets is also highly distributed near the wall.