非稳态气体射流的发展及碰壁过程计算机模拟

COMPUTER MODELING ON THE DEVELOPMENT AND WALL IMPINGEMENT OF UNSTEADY GAS JETS

用计算机模拟方法研究了非稳态气体射流的发展及碰壁过程,作为了解柴油机喷雾混气形成过程的辅助手段。计算中应用混合长度湍流模型和“粒子示踪法”,根据文献提供的基础数据,预测了非稳态氦气射流的贯穿度、浓度分布、速度分布及其随时间的变化等。计算结果和实验结果吻合,表明用计算机实验部分地代替物理实验是可能的。

Computer modeling, as a means of studying the mixture formation in diesel engines, is used in the study of the development and wall impingement of an unsteady gas jet. The mixing length turbulence model and particle track method are used in the calculations. Based on the experimental data taken from references, the penetration, distribution of the concentration and velocity of a helium jet and their variations with time were predicted. The agreement between the calculated and experimental results proves that the computer modeling described in this paper is convenient to adjust parameters and observe their influences and can be used instead of physical experiments to analyze physical phenomena in the experiment.