DEVICE FOR LASER IGNITION OF FUEL IN GAS GENERATOR OF LIQUID PROPELLANT ROCKET ENGINE Russian patent published in 2014 - IPC F02K9/95 

FIELD: power engineering.

SUBSTANCE: in a device for laser ignition of a gas generator of a liquid propellant rocket engine comprising zones of combustion and mixing of fuel components, comprising a source of electric energy, a block of excitation with optical fibre, at least one laser spark plug with a focusing lens, installed on a nozzle plate of a combustion chamber, having inner and outer walls, differing by the fact that the laser spark plug is installed at the periphery of the nozzle plate at the angle to the axis of the combustion chamber and is made in the form of a hollow sleeve installed outside of the gas generator connected with a metal bushing with the inner cavity of the gas generator, inside the sleeve there is at least one microchip-laser connected by a vacuum tube with a focusing lens at the end, sealed relative to the metal bushing. The angle of setting of the laser plug to a fire bottom makes from 60 to 80 degrees. The laser focusing may be arranged in the zone of combustion of fuel components. Inside each sleeve there is a damping facility. The damping facility is made of material having high heat conductivity. The damping facility may be metal rubber. Inside each sleeve there is a heat accumulator. The heat accumulator is made in the form of a container of cylindrical shape with a central hole, the cavity of which is fully or partially fixed with a heat-accumulating material, and is installed concentrically to the axis of the sleeve. The heat-accumulating material is sodium acetate trihydrate. The focusing lens is installed inside the metal bushing and is deepened into it relative to the inner surface of the inner wall of the fire bottom of the gas generator. The value of deepening of the focusing lens is arranged such that the focusing lens is installed inside the sleeve, for instance, near its bottom.

EFFECT: increased reliability of an ignition device.

11 cl, 17 dwg