摘要
建立了多层喷射沉积制备管坯的雾化过程热流模型,并对耐热铝合金熔滴在雾化飞行过程中与雾化气流的动能和热能交换进行了计算和分析.计算结果表明:①小直径熔滴在飞行过程中的平均冷却速度较大,其凝固可以在较短时间内完成;②不同直径熔滴飞行过程中的平均冷却速度均随飞行距离的增加而减小;③在0～0.2m的雾化距离内,直径为10～220μm的耐热铝合金熔滴平均冷却速度可以达到104K/s以上.
This paper established a model for the heat flow of the atomization process in preparing the multi-layer spray deposited (MLSD) heat-resistant Al alloy pipe blank, and calculated the kinetic energy and heat transformation between the molten droplets and the atomization gas. The results show:① The smaller droplets quench down at relatively higher cooling rate during their flight; ② The cooling rate of the droplets with different sizes decreases as the flight distance increases; ③ The cooling rate for the droplets with diameter 10～220 μm can reach up to 10~4K/s.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第1期7-11,共5页
Journal of Hunan University:Natural Sciences
关键词
雾化
喷射沉积
耐热铝合金
atomization
spray deposition
heat-resistant Al alloy
