金属熔体中高强超声空化气泡运动的数值研究

Numerical Research on Movement of Cavitation Bubble in Metal Melt under High Intensity Ultrasound

导出了可压缩液体中空化气泡泡壁运动方程，用该方程对高强超声场作用下铝熔体中空化气泡的运动规律进行了数值求解．结果表明，导出的泡壁运动方程保留了Ｕ／Ｃ的高次项，精度高于传统的不可压缩液体泡壁运动方程；高强超声场作用下铝熔体中空化气泡溃灭时可产生极高压冲击波；超声声压幅的大小对空化的强度和密度影响很大．

The equation which describes the motion of a cavitation bubble in compressible liquid is developed. Bubble dynamics of aluminum melt under the field of ultrasound is also studied by numerical solution of this equation. The results show that the equation is more accurate than the traditional equation, the shock wave produced by the collapse of the cavitation bubble in aluminum melt is very high and cavitation characteristic is strongly affected by the acoustic pressure of ultrasound.