喷射成形雾化器结构对流场的影响

Flow fields simulation of nozzle construction of spray forming atomizer

采用美国商用流体力学软件(CFD)模拟了喷射成形雾化腔内气体流动状态,分析了四种不同雾化器喷管结构的流场特点。结果表明:在一定的压力和尺寸条件下,汇聚喷管结构的高速射流区域比汇聚发散结构喷管大,对气体加速作用较好;导流管末端气流速度影响抽吸气体流率,从而影响引流效果;和汇聚发散结构相比汇聚结构喷管更适合用于双层雾化器引流结构。

The software of computational fluid dynamic techniques was used to calculate flow field in the atomizing chamber. The characters of flow fields of different nozzle structures were analyzed. Results are summarized as follows： convergent nozzle contributes to gas with high kinetic energy at the bottom of delivery in the same condition of convergent/divergent nozzle,which benefits gas acceleration. Gas velocity has effect on gas pumping from delivery tube at the bottom of delivery,which can make melt metal flow rapidly. Convergent nozzle has a better effect on leading fluid.