中文摘要：

应用FLUENT模拟软件对影响喷嘴射流切割特性的喷嘴圆锥段收缩角、圆柱段出口直径及长径比进行了数值模拟研究。结果表明：出口直径为2 mm、长径比为2、收缩角为10＆#176;的喷嘴轴向速度和射流冲击能量最大，切割能力最好；射流轴向速度在喷嘴圆锥收缩段急剧增加，在圆柱段先增加后减小；射流冲击切割能量的最大值不是分布在冲击面上喷嘴对应的轴心处，而是在其半径方向的某一圆周上。

英文摘要：

Contract angle of cone segment,outlet diameter and length-diameter ratio of cylinder segment influenced the jet cutting property of nozzle were studied by numerical simulation using simulation FLUENT. The results show that：nozzle with outlet diameter as 2 mm,length-diameter ratio as 2 and contract angle as 10 degree,has the highest axial velocity and largest impact energy,as well as greatest cutting capability. Jet axial velocity increases rapidly along the cone contract segment of nozzle,but increases first and then decreases along the cylinder segment. The largest value of cutting energy of jet impact does not distribute at the axis center of the impact plane,but on a circumference along the radius direction responding to the nozzle.