铝熔液中空化泡崩溃过程数值模拟  

Simulation of Collapse Process of Cavitation Bubble in Aluminum Melt and Analysis of Grain Refinement Mechanism

作　　者：杨运猛[1] 胡仕成[1] 胡永清[1] 付明志[1] 毛勇[1] 张平[1] 

机构地区：[1]中南大学机电工程学院现代复杂装备设计与极端制造教育部重点实验室,长沙410083

出　　处：《特种铸造及有色合金》2009年第5期417-420,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA03Z103)

摘　　要：基于有限元方法,模拟了空化泡在破灭过程中形成的高压冲击波导致高温铝熔体的状态变化,得出微射流最大速度可达400m/s以上和瞬时最高压力达到1.0×105MPa。从理论上分析了空化效应细化枝晶的机理,建立了空化效应对熔体的过冷和枝晶破坏的数学模型,同时指出了模拟过程中的不足之处。The ultrasonic cavitation exhibits complex physical behavior in aluminum melt,and collapsing acoustic cavitation bubbles can result in instantaneous high pressure shock wave and jet flow in the partial zone of aluminum melt,which can play a key role in refining the grain size as a result of broken dendrite in the alloy.Based on the finite element method,effects of high pressure shock wave formed in the process of bubble collapse on aluminum melt change were simulated.Numerical simulation reveals that the instantaneous maximum pressure and maximum jet flow velocity can reach 105MPa and 400 m/s,respectively.Mechanism of cavitation effects refining grain size in aluminum alloy are described theoretically.Mathematical model for cavitation effects on melt super-cooling and dendrite broken is established.In addition,problems in simulation are presented.

关 键 词：空化泡 有限元法 压力 射流 细化 

分 类 号：TG292[金属学及工艺—铸造]