The object of research - the formation processes of self-oscillations of pressure depending on the parameters of the cavitation generator and their influence on the cavitation parameter when converting the static mode of fluid injection in the pulse. The purpose of work: the substantiation the parameters of the cavitation generator, which expands the operating range of the self-oscillation frequency and amplitude of pressure from the parameter of cavitation to improve the efficiency of the mining equipment complex at coal bed hydro-breakage with low hydraulic permeability. Research Methods. The work adopts a comprehensive research method that includes analysis and research synthesis of the phenomenon of periodically leaf cavitation in the study of the issue of coal bed hydro-breakage; the fundamental basic of hydrodynamics and research methods to periodically leaf cavitation in the fluid flow when solving problems for the definition the interdependence of the hydrodynamic and geometric parameters of the cavitation generator; methods of monitoring, recording, processing and analysis using modern computer techniques in laboratory and mining-experimental studies. The thesis is devoted to the substantiation of parameters of the cavitations generator for coal bed hydro-breakage, that works on flood liquid energy and converts directly in a rockhole the static pressure of the liquid into impulsive pressure. In this work the analysis of existing generators of pressure impulses for efficiency increasing of the forcing of a liquid in coal massive is made, the dependences of self-oscillations frequency of the liquid pressure on cavitations parameter are determined, the operating range of self-oscillations total amplitude existence behind cavitations generator is substantiated that it depending on its hydrodynamic and geometrical parameters, the results of laboratory and mine experimental researches are presented. It is determined that the construction of submerged cavitations generator with dcr = 2,5mm, relation D/dcr = 3,9-4,2 and lpl = 95-105dcr, provides the total amplitude of pressure self-oscillations up to 1,4 - 1,8 from liquid forcing pressure in the working range within 10,0 - 20,0 MPa with frequency of oscillations from 1000 to 7000 Hz within the limits of range 0,05 - 0,60 of the cavitations parameter. The use of hydro-impulsive influence at hydro-opening of coal bed with hydraulic low permeability allows to reduce the duration of forcing of the liquid on 50 % and the discharge of liquid on 60%, at the same time the safe area of excavation is extended from 4,0 to 6,0 m. Novelty. For the first time found that the submerged cavitation generators self-oscillation frequency dependence of the pressure from the cavitation parameter is linear. For the first time experimentally established that in the submerged cavitation generators, the range extension of the parameter of cavitation from 0,02 to 0,60 depending on the length of behind diffuser channel, thus the maximum amplitude of self-oscillations of pressure fluid displaces towards increase pressure of the coal bed hydroresistance. For the first time found that the amplitude of self-oscillations from 1,4 to 1,8 of liquid infusion pressure with a frequency from 1000 to 7000 Hz is provided by the new construction, at invention level, of submerged cavitation generator with length of behind diffuser channel from 95 to 105 of its critical diameter. An extent of an intrusion. At transition from drill and fire system to combine system of mine working with application of hydro-impulsive influence the expected economic effect benefits more than 5,5 million UAH/year on one combine. Field of usage. The new design of a submerged cavitation generator is developed and performed generator researching in the laboratory and production conditions. The using of cavitation generator in mining equipment has reduced the duration of pumping up to 50% and flow rate to 60%, increased the safe zone of robbing from 4,0 to 6,0 m. The experimental-statistical method for calculating the hydrodynamic parameters of submerged cavitation generator and methods of mining experimental works are developed, which are used in laboratory and industrial studies. "The methods of computing the parameters of the cavitation generator" is developed and sent to Teplogorsk plant hydraulic equipment Ltd..
