High Speed Impact Between Curved Liquid Surface and Rigid Flat Surface.

摘要

The phenomenon of liquid-solid impact has technological importance in various engineering applications. It was first noted for its damaging effect on hydraulic and steam turbines. Components of high-speed aircraft and missiles rapidly experience similar erosion damage when flying through a rain storm. Because the velocity component normal to the plane vanishes at impact,the impact of a liquid drop onto a rigid plane can be viewed as the head-on collision of two identical liquid drops travelling along the common axis with the same,but opposite,speed. The liquid in contact with the solid plane can thus be treated as if it were a part of interior liquid with the rigid surface as a plane of symmetry. This new way of treating the boundary condition at impact appears to improve the precision of the numerical results,particularly near the start of the impact.