When breaking rocks with a water jet, the flow due to the potential energy of pressure in the hydromonitor at the exit of the nozzle acquires kinetic energy and, freely interacting with air, is gradually aerated, which leads to the dispersion of the jet. Since the efficiency of the destruction process depends to a large extent on the compactness of the jet, the study of compactness and factors determining it is of practical interest.
When designing mining and tunneling mining machines operating on the principle of hydraulic stripping, it is important to know the dependence of productivity and energy consumption of solid bodies destruction by water jet on the speed of movement of the jet axis relative to the bottom face, on the water pressure in front of the nozzle, as well as on other parameters (radius of rotation of the nozzle, distance from the nozzle to the body to be destroyed, etc.).
