Modelling the laser fusion cutting process : II. Distribution of supersonic gas flow field inside the cut kerf
Modelling the laser fusion cutting process : II. Distribution of supersonic gas flow field inside the cut kerf
复制标题
激光熔化切割过程建模：II。
DOI：
10.1088/0022-3727/34/14/309
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Yue
中科院分区：
文献类型：
--
作者：
J. Duan;H. Man;T. Yue
建立了一个数学模型，计算了在进口滞止压力≥5 bar的情况下，超音速喷管输出的惰性辅助气体射流在激光切割切口入口、内部和出口的气体流场分布。根据切割面几何形状，采用二维解析方法对切割面上方分离激波的位置和形状进行了近似定位。采用二维特征法计算了沿切割锋面的气体流场分布。对流场分布的计算结果进行了计算机模拟，可用于不同切削条件下刃口质量的估计和分析。
A mathematical model is developed to calculate the distribution of the gas flow field at the entrance, inside and exit of a laser cut kerf for inlet stagnation pressures ≥5 bar for an inert assist gas jet exiting from a supersonic nozzle. A two-dimensional analytical method is adopted to locate approximately the position and shape of the detached shock above the cutting front surface according to the geometrical shape of the cutting front. A method of two-dimensional characteristics is applied to calculate the gas flow field distribution along the cutting front. The calculated results of the flow field distribution are simulated by the computer and can be used to estimate and analyse the cut-edge quality under different cutting conditions.