实心与空心锥形喷雾与热多孔介质相互作用的数值研究

在KIVA-3V中增加了油滴碰撞热多孔介质壁面的碰撞模型、传热模型及空心喷雾的线性不稳定性液膜破碎模型(LISA).在多孔介质结构简化描述的基础上,详细模拟了实心喷雾与空心锥形油雾与热多孔介质之间的碰撞过程.针对Senda等人的实验进行了数值计算,油束碰壁后油滴和油蒸汽分布的数值计算结果与实验结果吻合得很好.计算结果表明油雾在碰撞到热多孔介质后,油束会发生分裂,为油滴的快速蒸发和油蒸汽与空气充分混合创造了前提.油滴初始动能相同的条件下,空心喷雾的油滴穿越多孔介质的可能性比实心喷雾要小.

NUMERICAL INVESTIGATION OF THE EFFECTS OF FUEL SPRAY TYPE ON THE INTERACTION OF FUEL SPRAY AND HOT POROUS MEDIUM

The improved KIVA-3V code used here is incorporated with impingement model and heat transfer model.Linearized instability sheet atomization (LISA) model is also incorporated into the improved KIVA-3V code to model the hollow cone spray.With the structure of the hot porous medium being simplified,the interaction of fuel spray and the porous medium were simulated in detail.An evaporating fuel spray impingement on a hot plane surface was simulated under conditions of experiments performed by Senda.et.al.Numerical results compared well with experimental data for spray radius in liquid and vapor phases.Computational results about the interaction of fuel spray and hot porous medium show that fuel spray can be divided,which provides conditions for the quick evaporation of fuel droplets and the mixing of fuel vapor with air.The possibility of fuel droplets from hollow cone spray crossing the porous medium reduces compared with that from solid cone spray,with the same initial kinetic energy of fuel droplets in both injection types.