7050铝合金超声空化气泡动力学数值模拟  

Dynamics Numerical Simulation of Ultrasonic Cavitation Bubble in 7050 Aluminum Alloy

作　　者：李晓谦[1] 邓静[1] 林森[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

出　　处：《特种铸造及有色合金》2013年第5期395-399,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB731700)

摘　　要：运用Matlab软件研究了初始半径为1～50μm的空化泡在不同声压下的泡壁运动,并模拟了特殊情况下泡内压强的变化,给出了空化泡在崩溃点边缘产生的巨大局部压强。模拟了大半径的气泡在不同声压下的空化泡壁的运动。结果表明,声压越大空化泡膨胀越剧烈,空化泡内部压强越小。空化泡半径越大,空化泡膨胀幅值越小。声压较大,初始半径较小时,大部分空化泡存在时间很短,相反,气泡能存在较长时间,有时能产生稳定的颤动而不会崩溃。最后在水中进行了试验模拟,试验结果和模拟结果符合较好。With the help of Matlab software, movement curves of cell wall with initial radius varying between 1 μm and 50μm were simulated at different acoustic pressure, and the change of internal pressure in cavitation under some special situations was visualized also. Meanwhile, occurrence of enormous partial pressures of cavitation bubble near collapse points was presented. In addition, the larger bubbles＇ movement at different acoustic pressures was simulated. The simulated results show that with the in- crease of acoustic pressure, the expansion of bubble is more and more obvious and the pressure in the cavitation bubbles is decreased. With increasing in the bubbles radius, the amplitude of the cavitation bubbles expansion is decreased. With the large acoustic pressure and the small initial radius, the bubbles exist in a short time, on the contrary, they can stay a lapse but pulsate in the time. At last, the experimenta are well in agreement with the simulated ones. ong time, where sometimes the bubbles not col simulation in water was conducted. The results are well in agreement with the simulated ones.

关 键 词：空化泡 泡壁运动 数值模拟 泡内压强 

分 类 号：TG21[金属学及工艺—铸造]