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A Fuel Multipoint Uniform Injection System for Lean Direct Injection Combustion Chamber

A technology of injection system and combustion chamber, applied in turbine/propulsion fuel delivery system, charging system, combustion air/combustion-air treatment, etc., can solve the problem of large temperature gradient of combustion chamber, shortened combustion chamber life, and excessive thermal stress and other problems, to achieve the effect of improving combustion performance, optimizing injection stability and uniformity, and low pollutant emissions

Inactive Publication Date: 2018-01-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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

Method used

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  • A Fuel Multipoint Uniform Injection System for Lean Direct Injection Combustion Chamber
  • A Fuel Multipoint Uniform Injection System for Lean Direct Injection Combustion Chamber
  • A Fuel Multipoint Uniform Injection System for Lean Direct Injection Combustion Chamber

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] like figure 1 , figure 2 , image 3 , Figure 11As shown, the lean direct injection combustion chamber mainly includes the lean direct injection combustion chamber including the air intake section 15 , the installation section 13 and the combustion chamber body 6 connected in sequence. Wherein the air intake section is a rectangular cross-section air inlet, the air intake section 13 both ends are respectively provided with the air intake section inlet flange 1 and the air intake section outlet flange 2, the air intake section inlet flange 1. Connect the upstream air flow pipe; the upper and lower walls of the air intake section have holes, and the air intake pipe 28 is fixed by welding with the outer wall surface 48 of the air intake pipe. A boss 47 is designed on the outlet flange 2 of the air inlet section to cooperate with the downstream installation sec...

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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 lean-oil direct injection combustion chamber, and belongs to the technical field of gas turbine engines. Background technique [0002] Today's aircraft engines are also demanding less air pollution emissions while pursuing higher and higher efficiency. While high efficiency means increasing the overall temperature of the engine's combustion chamber, the reduction in pollutant emissions is directly related to lowering the maximum temperature of the combustion chamber. Pursuing high efficiency and reducing pollutant emissions are often a tit-for-tat conflict. Among the emissions of various pollutants, the reduction of Nox (nitrogen oxides) is the most concerned. The chemical reaction rate of combustion to form NOx is an exponential function of the maximum temperature of the reactants in the combustion chamber. Even if the interval between reaching the maximum temperature in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02C7/22F02C7/04F23D14/02
CPCF23D14/02F23D14/46F23D14/48F23D14/72F23D2203/007
Inventor 李建中任勇智李文杰巩二磊陈坚胡阁李维
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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