【摘要】 采用流体力学FLUENT软件模拟电极感应熔化气雾化制粉技术的气体流场状态。设置超音速喷嘴在不同入口压力（2、3、4 MPa），超音速喷嘴出口之间不同角度（40°，45°，50°）及喷嘴出口与喷嘴中心孔（金属液流下落通道）之间不同距离（12、18、22 mm）的客观条件参数，模拟气体流场在雾化室内流动规律。结果表明，气体流场均呈一系列膨胀波与压缩波的射流结构。提高喷射压力，能有效提升气体射流速度，理论上能产生更大的剪切力，将有利于雾化。合理调整喷嘴间夹角能让气体与管壁间尽量减少沿程压力损失，同时也能控制回流气场位置。回流气场位置也受喷嘴出口与金属液流间距离的影响，随着气体射流与金属液流间距离的加大，气体射流在运动过程中逐渐降低速度才交汇成回流气场，该流场位置远离喷嘴中心孔（金属液流下落通道），引起雾化不充分导致粉末颗粒粗大，不规则形状粉末占比大。如果回流气场靠近喷嘴中心孔（液流下落通道）会阻碍液流下落，造成反喷、喷溅。更多还原

【Abstract】 The gas flow field of electrode-induced melting gas atomization technology was simulated using the FLUENT software for fluid dynamics. The influence of supersonic nozzle on different inlet pressures(2, 3, 4MPa), angles(40°, 45°, 50°), and distances(12, 18, 22 mm) between the supersonic nozzle outlet and metal flow were analyzed. The results indicate that the gas flow field exhibits a series of expansion wave and compression wave jet structures. Increasing the injection pressure effectively enhances the velocity of the gas jet and theoretically generates greater shear force to facilitate atomization. Proper adjustment of the nozzle angle minimizes pressure loss between the gas and pipe wall while controlling the position of the return gas field. Additionally, the distance between nozzle outlet and metal liquid flow affects the location of reflux gas field. As this distance increases, there is a gradual reduction in speed as well as convergence into reflux gas field before being far away from nozzle outlet. If reflux gas field is near center hole(liquid flow down channel) of nozzle, it hinders downward liquid flow leading to reverse injection and splashing. Conversely, if return gas field is far from center hole of nozzle, insufficient atomization occurs resulting in coarse powder particles with irregular shapes.更多还原