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根据流体力学原理，用离散涡方法建立了在复平面上模拟喷嘴出口流场的一套完整模型。在此基础上，用ＦＯＲＴＲＡＮ语言编写了计算机程序，模拟了喷嘴出口流场的速度分布，利用涡元矢量图对计算结果进行了分析，得出了射流在喷嘴出口分离流动及流场中旋涡形成及发展的规律。射流在有锐缘的地方会发生流动分离，形成的剪切边界层逐渐卷起，形成旋涡结构。在喷嘴出口与哨嘴出口处形成的旋涡结构，在势流流场和其它涡元的作用下逐渐向下游运动，并向两边扩散。由于粘性扩散及计算误差的影响，在远喷距处会出现涡旋结构变形
According to the principle of fluid mechanics, a complete model of the flow field at the exit of the simulated nozzle on the complex plane is established by using the discrete vortex method. On this basis, a computer program is written in FORTRAN language to simulate the velocity distribution of the nozzle exit flow field. The vortex vector diagram is used to analyze the calculation results. It is concluded that the jet flows in the exit of the nozzle and the vortex formation in the flow field And the law of development. Jet flow in a sharp place where there will be flow separation, the formation of the shear boundary layer is gradually rolled up to form a vortex structure. The vortex structure formed at the outlet of the nozzle and the outlet of the whistle nozzle gradually moves downstream under the influence of the potential flow field and other vortices and spreads to both sides. Due to the influence of viscous diffusion and calculation error, vortex structure deformation will occur at long distance