FIELD: construction and geology, particularly to break natural and artificial scale and deposits and to drill holes.
SUBSTANCE: method involves supplying water under pressure at hydraulic cavitational device inlet; activating hydraulic cavitational process in the device with the use of cavitational body located inside the device; directing cavitation water jet from device outlet to surface to be eroded. Pressure of 90-200 atm is provided at device inlet. Space in front of surface to be broken is filled with water for height of at least 300 mm of water column. Distance between device outlet section and surface to be broken is 20-1500 mm. Hydraulic cavitational process has maximal power to provide vibratory super-cavitation with local medium heating, water ionization and cavitational erosion of surface to be broken. This is provided by two ways of water jet direction inside the device. In the first case water jet is directed through two-step chambers having different cross-sections. In the second case water jet passes trough hollow cavitational body made as contraction tube secured inside the chamber. Both water jets are mixed with each other at device outlet. Vibratory super-cavitation presence is detected. Device comprises hollow body with opposite opened ends, cavitational body secured in the body so that the cavitational body extends in longitudinal body direction, and hollow nozzle. Body interior is made as two-step cylindrical chamber. The first step is inlet step and has diameter not exceeding 0.5 of that of the second step. Cavitational body is hollow contraction tube having wavy surface and tapering in water jet direction from device inlet. Ratio between the smallest nozzle and contraction tube diameters is 1.25-2.0.
EFFECT: increased cavitational jet power.
5 cl, 4 dwg
