采用流体体积方法耦合雷诺应力模型与离散相模型结合泰勒类比不稳定性破碎模型，利用计算流体力学软件Fluent19.2，对紧耦合环缝喷嘴初次雾化与二次雾化进行全流程仿真，并进行了试验验证。结果表明：初次雾化过程使导流管底部形成环形液膜结构，液膜前端的初次雾化主要是气体射流自由边界湍流剪切的结果，并且初次雾化形成的液滴直径满足正态分布；随着分散的液滴群外侧接触气体射流，从液滴群的外侧开始向心部发生二次雾化过程，但是未接触气体射流的液滴仍保持较高的过热度。仿真得到紧耦合环缝喷嘴二次雾化后粉末的直径与试验结果吻合较好，相对误差小于5%，验证了仿真的准确性。

The volume of fluid approach was coupled the Reynolds stress model and the discrete phase model combined with the Taylor analogy break-up instability breaking model to simulate the primary atomization and secondary atomization for the close-coupled annular nozzle by computational fluid dynamics software Fluent19.2, and the simulation was verified by experiment. The results show that the primary atomization resulted in the forming of an annular liquid film at the bottom of the delivery tube. The primary atomization at the tip of the liquid film was mainly the result of turbulent shear at the free boundary of the gas jet, and the diameter of the droplets formed by the primary atomization satisfied the normal distribution. As the outside of the dispersed droplet group contacted the gas jet, the secondary atomization gradually started from the outside of the droplet group to the core, but the droplets those did not contact with the gas jet maintained a high degree of superheat. The simulated diameter of the powder after secondary atomization by the close-coupled annular nozzle was in good agreement with test results, and the relative error was less than 5%, which verified the accuracy of simulation.