Multipoint uniform fuel injection system for lean-oil direct-injection combustor

Abstract

The invention discloses a multipoint uniform fuel injection system for a lean-oil direct-injection combustor and belongs to the technical field of gas turbine engines. The multipoint uniform fuel injection system comprises a front-end system, an air intake segment, a connecting segment, a mounting segment, a hydrocyclone system and a pressing piece. According to the system, the fuel feeding manner of multipoint fuel inlet and multipoint-fuel-outlet is adopted, to overcome the defect that diversion of the fuel in all pipelines is nonuniform, a fuel front-end pressure stabilizer can be adopted, two pressure stabilizing tanks are adopted in the fuel-end pressure stabilizer for prestorage and pressure stabilization, and the effect that the fuel enters the stable state is guaranteed; and then six intake pipes are vertically and symmetrically distributed in the rectangular plane, uniform division of the intake pipes on all oil injection rods is guaranteed, and uniform fuel-gas mixing of all points is achieved; lean oil combustion of all points predicted in experiments is achieved after fuel flow regulation, and low pollutant emission is achieved. The problem that local fuel-rich combustion caused by different fuel flows at all nozzles due to the design scheme of single point oil inlet and multipoint oil outlet can be solved, and the phenomenon that nonuniform temperature distribution caused by unreasonable design of a system is avoided.

Description

technical field [0001] The invention relates to a fuel multi-point uniform injection system for a fuel-lean direct injection combustion chamber, and belongs to the technical field of gas turbine engines. Background technique [0002] Today's aero engines require less air pollution while pursuing higher and higher efficiency. While high efficiency means increasing the overall temperature of the engine's combustion chamber, the reduction of pollutant emissions is directly related to reducing the maximum temperature of the combustion chamber. The pursuit of high efficiency and the reduction of pollutant emissions are often tit-for-tat contradictions. Among the emissions of various pollutants, the reduction of NOx (nitrogen oxides) has attracted the most attention. The chemical reaction rate of combustion to generate NOx has an exponential function relationship with the maximum temperature of the reactants in the combustion chamber. Even if the interval of reaching the maximum...

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Problems solved by technology

Both structures use the oil supply method of single-point oil inlet and multi-point oil outlet, which causes uneven distribution of oil and gas in the combustion chamber, resulting in a large temperature gradient inside the combustion chamber, and excessive thermal stress in the combustion chamber may shorten the combustion process. chamber life

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