AIR-FUEL TWO-ZONE BURNER OF COMBUSTION CHAMBER OF GAS TURBINE ENGINE Russian patent published in 2020 - IPC F23R3/14 

FIELD: machine building.

SUBSTANCE: invention relates to gas turbine engines, particularly, to designs of main combustion chambers. Fuel-air two-zone burner of gas turbine engine combustion chamber, mainly operating on liquid fuel, which forms pilot and main circuits and includes nozzle in the form of housing with fuel supply channels, a row of coaxially installed swirlers in the form of annular channels with blades for air flow swirling, a separator of fuel-air mixture flow arranged radially between channels of swirlers of the pilot and main circuits. Spherical tangential sprayer is used to spray the main circuit fuel. There are two channels of fuel supply in pilot circuit. In pilot circuit optimum value of excess air factor at maximum engine operating mode is α_start. = 0.618, and optimum value of excess air factor in main circuit at maximum mode α_princ. = 1/α_start. = 1.618. Performing a flow divider comprising an annular deflector and a cavity in which compressed air from the compressor enters the cavity and then flows through the perforation in the wall of the flow divider to the annular deflector, increases dispersion of fuel spray, provides for mixing at short length, excludes possibility of formation of hot and cold zones and reduces peaks of temperatures in flame, which contributes to reduction of emission of NO_x, CO, C_xH_y in combustion products and improvement of fuel efficiency of engine.

EFFECT: application of additional channel of fuel supply in pilot circuit allows to expand range of stable operation of burner at transition modes.

3 cl, 2 dwg