Patent ID: 8827176
Filing Date: 2014-09-09
Classification: F23D,Y02E

Abstract:
1. A method for producing a supersonic flame jet stream from a torch for heating and spraying a coating material onto a substrate, the method comprising the steps of: providing a central passage terminating at a distal end and in a proximal end region, the passage being bounded by a passage sidewall and extending along a central axis, the central passage having a diameter D and a length L measured along the central axis from the location at which the fuel is introduced to the distal end, where the length L is selected such that the ratio L:D is less than 3; introducing fuel and oxygen, reactants, into the proximal end region of the central passage so as to form a concentric stream of reactants having a central stream of oxygen advancing along the central axis and a surrounding stream of fuel that is distributed about the central stream of oxygen, the fuel being introduced so as to contact the passage sidewall upon introduction, allowing the reactants to pass through the central passage and exit at the distal end, thereby allowing the reactants to mix as they progress through the central passage, igniting the mixed reactants exiting the passage to generate a supersonic flame jet resulting from progressive mixing and combustion of the reactants within the passage, the supersonic flame jet extending beyond the distal end.