Low-pollution combustor head structure with main combustion stage oblique jetting nozzle

Abstract

The invention discloses a low-pollution combustor head structure with a main combustion stage oblique jetting nozzle. The low-pollution combustor head structure is composed of a main combustion stageblade, a pre-combustion stage blade, a main combustion stage premixing channel, a Venturi tube, an interstage section, the main combustion stage oblique jetting nozzle and a pre-combustion stage nozzle. A combustor adopts a center grading combustion structure mode, specifically, in the main combustion stage, air passes through an axial swirler to be blended with obliquely jetted fuel, and the mixture passes through a pre-mixing section, so that uniformly mixed gas is formed; and in the pre-combustion stage, air flows into the combustor through a two-stage radial swirler, fuel is jetted out bya dual-oil-path nozzle to be blended with air for diffusive combustion, and a stable ignition source is provided for the combustor. By means of the oblique jetting structure, fuel and air can be sufficiently mixed in the main combustion stage, the fuel and air premixing uniformity is improved, and thus pollutant emission is reduced; and as a pneumatic flow guide structure is adopted for the head,flames of the main combustion stage and the pre-combustion stage are burnt layer by layer, and the ignition performance and combustion efficiency under small conditions and the flame stability and discharging performance under large conditions are improved advantageously.

Description

technical field [0001] The invention relates to the technical field of a swirl burner, in particular to a low-pollution combustion chamber head structure in which a main combustion stage adopts oblique injection nozzles. Background technique [0002] Pollutants emitted by civil aero-engines have caused more and more serious harm to human health and the environment. With the improvement of people's living environment requirements, reducing the emission of aero-engine pollutants has become an urgent problem to be solved. [0003] As the main pollution emission source of aero-engine, gas turbine combustor plays a decisive role in reducing engine pollution emission. NO due to aviation gas turbine x It is mainly caused by the high temperature in the combustion chamber, so controlling the equivalence ratio and local equivalence ratio of the combustion chamber becomes the key to reducing the pollution emission of the combustion chamber. [0004] At present, the number of centrall...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a swirling flow combustion that can provide a larger heating range, stability, and low pollution in view of the shortcomings of the existing combustion chamber, such as small combustion range, small heating area, instability, and high pollutant discharge. The center-staged swirler structure is adopted to give full play to the advantages of the pre-combustion stage for ignition and flame stability, and the oblique injection of the main combustion stage can strengthen the mixing of fuel and air, and the mixed gas can be evenly mixed through the pre-mixing section, which can Effectively improve combustion efficiency and reduce air pollution; the main combustion stage structure of the central stage cyclone is designed as a strong swirl structure, which effectively increases the opening angle of the premixed gas diffused downstream and increases the combustion range, while the double-layer premixed The ignition effect of the combustion stage flame on the main combustion stage premixed gas can effectively solve the ignition problem of the main combustion stage

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