摘要：为探究钐铁熔体气雾化过程中高压环境和雾化介质组分对雾化结果的影响规律, 基于紧耦合气雾化喷嘴结构, 采用Fluent软件对熔体高压气雾化淬冷过程进行模拟, 分析不同环境压力和氮气-氩气混合组分下的熔体雾化氮淬过程。结果表明, 环境压力越大雾化效果越好, 纯氮气组分下达到相对理想的雾化效果的最低环境压力为3.0 MPa;随着氩气含量的增加, 雾化效果在较低的环境压力下提前达到相对理想的稳定程度, 但过多的氩气不利于雾滴的冷却与后续熔体渗氮的研究, 综合考虑雾化效果较理想的条件为, 氮气、氩气体积比为1:3, 环境压力为2.0 MPa。

关键词：雾化模型；氮淬；环境压力；气体组分

Abstract：To explore the influence of ambient pressure and gas composition on the results in the atomization process of Sm Fe melt, atomization and nitrogen quenching process of liquid Sm Fe alloy with high pressure was simulated using Fluent based on the close-coupled nozzle. Simulation results show that high ambient pressure can obviously improve the atomization effect and the minimum ambient pressure is 3.0 MPa when the atomization effect is relative ideal using pure N2 as atomized gas; mix Ar to N2 can reduce the ambient pressure needed for the atomization, but too much Ar can cause an adverse impact on the spray cooling and melt nitriding; in summary, when N2 content at 25% and the ambient pressure is 2.0 MPa, atomizing effect gets its maxima.

Keywords: atomization model；nitrogen quenching；ambient pressure；gas composition