The nozzle, the fluids last passageway, is the critical component for controlling outlet velocity, range, and atomization. This paper uses three-dimensional numerical analysis software to analyze the main parameter which affects the nozzle's work performance and gets the outlet velocity by computer calculation. As compared with the different structure nozzle's outlet velocity,this paper also gets the best parameter of nozzle jet. The nozzle's performance is the best possible ,when the contract angle is at 12 ～ 14 degree; the outlet diameter is 0.5 ～ 0.6 times inlet; the length of outlet nozzle is 3 ～ 4 times the outlet diameter.%喷嘴是流体最后通道,起到最后加减速,控制雾化度、出口速度、喷射射程的关键部件.用三维数值分析软件对影响喷嘴喷射性能的各个参数进行定量的模拟分析,通过计算得出喷嘴出口速度,最后比较各个不同结构的喷嘴出口流速来确定最佳的喷嘴结构形式.得出喷嘴在收缩角度为12°～14°,喷嘴出口端与入口端直径比在0.5～0.6,出口整流段长度为3～4倍出口端直径时喷嘴的喷射性能为最佳.
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