GEOMETRICAL AND FREQUENCY PARAMETERS OF ROTARY-HYDROCAVITATION WORK INSTRUMENT’S PULSE GENERATION

In this article we presented mathematical model and geometrical and frequency parameters calculation of pulse generator node, which built into the work instrument for rock breaking by combined rotary-hydroсavitation method. The developed method allows to use specific energy of cavitation flow which reaching (104 ... 105) kWh/m3 . Permanent magnets used for axial focusing of cavitation flow in the body of work instrument. Due to magnets’ action occurs oscillations cavities interference. As a result, cavitation’s frequency increase to subresonance. Subresonant flow creates additional stress on rock. Natural and artificial fractures formed, rocks’ resistance to cutting reduce, rock breaking energy reduce by 10%