【摘要】 电极感应熔化气雾化(EIGA)是制备超洁净无夹杂物粉末的先进技术。雾化制粉过程涉及多物理场耦合，机理复杂，难以实现精准调控，而数值模拟可以进行可视化呈现。根据拉瓦尔喷管结构原理，运用SolidWorks建模软件构建非限制式喷嘴结构模型，并导入流体力学Fluent软件进行两相流模拟。高速钢液流的雾化过程分为一次雾化与二次雾化，采用精度更高的大涡模拟法(LES)结合自适应网格方法，对不同直径(3,4和5 mm)的液流进行雾化模拟。当出口质量流量趋于稳定，视为完成一次雾化模拟过程。二次雾化是在一次雾化的基础上建立子模型，并提取粒径为0.5 mm的单液滴进行模拟。结果表明，超音速气体射流对高速钢液流进行冲击雾化，在一次雾化过程中，随着高速钢液流直径的增大，其破碎成液滴群的平均粒径也变大。二次雾化采用更加精密的网格以捕捉破碎雾化后更加细小的液滴，模拟液滴粒径主要分布在50～250μm。更多还原

【Abstract】 Electrode induction melting gas atomization(EIGA) is an advanced powder preparation technology for producing ultra-clean, inclusion-free powders. The atomization powder preparation process involves multi-physical fields coupling, complex mechanisms make atomization difficult to achieve precise control, while numerical simulation can intuitively represent this intricate and hard-to-master process. Based on the structural principle of the Laval nozzle, a supersonic nozzle model was constructed using the SolidWorks modeling software and imported into the computational fluid dynamics software Fluent for two-phase flow simulation. The atomization process of high-speed steel molten flow is divided into primary atomization and secondary atomization. A more accurate large eddy simulation(LES) method combined with adaptive mesh method was used to simulate the molten flow with different diameters(3, 4 and 5 mm). The primary atomization simulation was considered complete when the outlet mass flow rate tended to stabilize. For secondary atomization, a sub-model was established based on the primary atomization, and a single droplet with a particle size of 0.5 mm was extracted for simulation. The results show that the supersonic gas jet impacts and atomizes the high-speed steel molten flow. During the primary atomization process, as the diameter of the high-speed steel molten flow increases, the average particle size of the droplet group formed by its fragmentation also increases. The secondary atomization adopts a more precise mesh to capture the finer droplets generated by fragmentation and atomization. The simulation results indicate that the particle size of the droplet group is mainly distributed in the range of 50～250 μm.更多还原