Determination of the dynamic characteristics of the abrasive water jet for process manufacturing

The water jet at high pressure is used in the manufacturing processes of machines, especially that of cutting. This technique, which is encountered in many industrial applications, is known for its complexity when using the experimental approach. From this viewpoint, an accessible and less expensive method is used, aiming to provide further knowledge on this machining process. The numerical approach is employed, taking into account the fluid flow before the abrasive jet of water in the atmosphere, i.e., in the focusing tube, as well as the free jet itself. Calculations have been achieved for different working conditions. The validation was performed by comparing our results with other available data, and a satisfactory agreement was found. The obtained results revealed a reduction in the fluid velocity during the first moments of the jet due to the carrier abrasives, resulting thus in an increase in the speed of abrasive particles in the same space and time. According to the predicted findings, the shooting distances are commended to be between 1 and 5 mm from the entrance of the jet.