组合雾化过程中熔滴的飞行动力学与热历史的数值模拟

发布时间：2018-03-30 21:49

本文选题：组合雾化　切入点：动力学　出处：《粉末冶金材料科学与工程》2017年01期

【摘要】：采用数值模拟方法研究组合雾化过程中熔滴的飞行动力学以及冷却凝固过程与熔滴随飞行距离的变化关系,模拟过热度和旋转盘转速对熔滴飞行和冷却凝固的影响规律。结果表明:在组合雾化过程中,熔滴尺寸显著影响熔滴的动力学和热历史过程,熔滴越小,速度变化越快,飞行距离越短。过热度对于熔滴的冷却凝固影响不明显,但大的过热度会延缓熔滴的凝固过程。因此,大的过热度不利于雾化室的设计。旋转盘的旋转速度对于熔滴热历史的影响稍大于过热度的影响,高转速可以缩短熔滴冷却凝固过程的飞行距离。通过测量二次枝晶间距,推算出实验制得粉末的冷却速率范围为10~3~10~6 K/s,与数值计算的结果基本一致。
[Abstract]:The dynamics of droplet flight during the combined atomization process and the relationship between the cooling and solidification process and the variation of droplet with flying distance were studied by numerical simulation. The effects of superheat and rotating speed on droplet flight and cooling and solidification were simulated. The results show that the droplet size significantly affects the droplet dynamics and thermal history during the combined atomization process. The smaller the droplet is, the faster the velocity changes. The shorter the flying distance, the less the effect of superheat on the cooling and solidification of the droplet, but the larger the superheat, the slower the solidification of the droplet. Large superheat is not conducive to the design of atomizing chamber. The effect of rotating speed of rotating disk on droplet thermal history is slightly greater than that of superheat, and high rotational speed can shorten the flying distance of droplet cooling and solidification process. The cooling rate of the powder is calculated to be 10 ~ 3 ~ 10 ~ (6) K / s, which is in good agreement with the numerical results.
【作者单位】：华南理工大学国家金属材料近净成形工程技术中心;
【基金】：广东省科技计划资助项目(2014B010129002)
【分类号】：TF123.112

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