农业装备与车辆工程精选文章 关键词：柴油机；数值模拟；涡流；滚流 [gap=691]Keywords： diesel engine； numerical simulation； swirl； tumble
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Horizontal swirl, axial tumble and the distribution of turbulent kinetic energy are very important for fuel atomization and mixture formation.
水平方向的涡流、轴线方向的滚流以及湍动能的这种分布特性都非常有利于燃油的雾化以及与空气的混合。
参考来源 - 燃烧室形状对170柴油机性能影响的分析·2,447,543篇论文数据，部分数据来源于NoteExpress
发现四气门汽油机各缸产生的最大滚流轴线与曲轴轴线夹角是不同的。
The results show that the Angle between maxi - mum tumble axis and crank axis generated by each cylinder in a four-valve gasoline engine varies.
用热线风速仪研究了缸内滚流的形成过程，发现滚流轴线与水平面的夹角随气门升程的增大而增大。
It is found that the Angle between tumble axis and horizontal plane increases with valve lift. The "tumble" is not a pure tumble, but is a inclined swirl.
据此建立了缸内滚流比预测模型，并在稳流试验和拖动工况下缸内流动的LDA测量试验中得到验证。
A model for predicting the tumble speed is derived and verified by the steady flow rig and the in-cylinder flow measurement results by a LDA system.
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