脉冲磨料射流中球泡溃灭特性的理论

从理论上研究了脉冲磨料射流中球泡的溃灭特性，建立了脉冲磨料射流中空化球泡的动力方程，分析了磨料粒径和浓度对射流中空泡溃灭过程的影响规律。研究表明，在磨料粒度和密度较小时，粒径的变化对空泡溃灭影响不大，浓度的增加使得混合流体的粘性增大而且使渍灭空泡附近的磨粒动能增加，使得空泡溃灭过程减缓。在磨料粒度和密度较大时，粒径越小对空泡溃灭的阻滞作用越大，浓度的增加同样使得混合流体的粘性增大、溃灭空泡附近的磨粒动能增加，射流的空蚀强度减弱。

Theoretically Investigation of Dynamic Characteristics of Spherical Bubble Collapse in Pulsed Abrasive Water Jet

This paper theoretically investigates the characteristics of cavitating bubbles in the pulsed abrasive water jet(PAWJ) and establishes the dynamic equations of cavitating bubbles. The effects of abrasive diameter and density on the spherical bubble collapse are also analyzed. It is found that the change of abrasive diameter rarely affects the bubble collapse when the abrasive diameter and density are small whereas the smaller abrasive greatly blocks the bubble collapse when the abrasive diameter and density are comparably big. It is also shown that when the abrasive density is increased, the fluid viscosity rises, and the kinetic energy of the abrasives near the collapsed bubble is enhanced and meanwhile the intensity of cavitating erosion is weakened.