METHOD FOR THERMOABRASIVE WORKING OF SURFACES AND APPARATUS FOR ITS EMBODIMENT Russian patent published in 2001 - IPC

FIELD: jet type thermoabrasive working of surfaces of metallic structures, parts of different materials, possibly removing radioactive contaminations from different surfaces, breaking rocks, working natural stones and artificial minerals. SUBSTANCE: method for thermoabrasive working of surfaces by means of double-phase supersonic flow of working fluid comprises steps of creating and speeding up working fluid by supplying to combustion chamber abrasive aeromixture and fuel mixed with a part of oxidizer whose other part is fed to combustion chamber through radial openings. Oxidizing agent through radial openings is fed in two zones of combustion chamber: fuel combustion zone and mixing zone; abrasive aeromixture is fed to space (behind mixing zone) in which profile of flow speed and temperature is formed at rate equal to flow speed. Speed of working fluid flow is sustained higher than sound velocity by 1.1-4.8 times. Apparatus for performing the method includes pipeline for abrasive aeromixture around which swirler is placed, envelope, regenerative pipe, nozzle, combustion chamber formed by flame pipe with radial openings and swirler, and housing with duct for feeding fuel and duct for feeding oxidizer to space between envelope, regenerative pipe and flame pipe. There is mixing chamber in housing joined with duct for feeding fuel and communicated with duct for feeding oxidizer and with swirler. Radial openings of flame pipe are provided in zone of fuel burning and in zone for mixing oxidizer with combustion products. Outlet cut of pipeline for abrasive aeromixture is arranged between terminal row of radial opening and inlet cross section of nozzle having cylindrical portion with relation of its length to diameter in range 4-8. EFFECT: enhanced quality and efficiency of thermoabrasive working. 5 cl, 1 dwg