NUMERICAL ANALYSIS ON THE STRESS DISTRIBUTION OF SUPER HIGH PRESSURE WATER JET-FLOW IMPINGING SOLID

The stress distribution in the media under high pressure water jet-flow remains unknown and this restricts the application and development of the water jetting technology. A numerical analyzing model of stress distribution about interaction of super high water jets impinging no porous elastic solid is established according to fluid-structure interaction theory. Standard K-epsilon dual-equation model and controlled volume method for the water jets, and elastic orthotropic continuum and finite element method for the solid are adopted. Also, the numerical method for both material interactions is given. The stress distributions in the fluid field and the media with different water jetting velocity are computed using the model and method. Numerical results show that the stress distributes obviously on the part solid under water jets impingement. The impinging area is subjected to compression stress, and the maximum tensile stress is located on impacting surface and the maximum shear stress being under impacting center about half nozzle diameter away. It concludes that by controlling the jet velocity and distance, jet cutting, breaking, washing, surface processing efficiencies could be improved.