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A swirl combustor head with variable inlet cross-section

A combustion chamber and head technology, applied in the field of low-pollution combustion of aero-engines, can solve problems such as low NOx generation rate, achieve high combustion efficiency and reduce emissions

Active Publication Date: 2020-06-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this temperature range, the generation rate of pollutants NOx, UHC, CO, etc. is low

Method used

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  • A swirl combustor head with variable inlet cross-section
  • A swirl combustor head with variable inlet cross-section
  • A swirl combustor head with variable inlet cross-section

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Embodiment Construction

[0025] The present invention will be further described now in conjunction with accompanying drawing:

[0026] combine figure 1 , the invention provides a swirl combustor head with variable inlet cross-section.

[0027] Specific process: In low operating conditions such as take-off and high-altitude re-ignition, the guide vanes maintain the maximum windward area ( Figure 4 ), the duty-level nozzles are supplied with fuel until the start-up process is completed, and the main fuel-level nozzles do not supply fuel or supply a small amount of fuel. In this case, the on-duty air forms a recirculation zone. At this time, only the on-duty air participates in the combustion in the main combustion zone. In the design state, the oil-gas ratio far exceeds the chemical proper ratio, forming a fuel-rich combustion state. In this state, the ignition is easier and the lean flameout limit is wider, which effectively improves the ignition and lean flameout performance of the combustion chamb...

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Abstract

The invention provides a swirl combustor head with a variable air inlet section. The head comprises structures such as a central duty stage, an outer-side main combustion stage, flow guiding vanes capable of rotating around the central axis, Venturi tubes, a sleeve and the like. Air and fuel are supplied in a classified manner, the air inlet amount of the main combustion stage is mainly controlledby the aid of the flow guiding vanes, and the air inlet amount of the central duty stage is determined by the area of the throat of a duty-stage swirler; a centrifugal pressure atomization nozzle isadopted on the central duty stage; and multiple direct-injection air atomization nozzles are adopted on the outer-side main combustion stage. According to the head, the air inlet amount of the main combustion stage can be changed through rotation of the flow guiding vanes, so that the slow lean blowout limit of the combustor is lowered, pollutant discharge of an outlet of the combustor during design of the point state is reduced, and stable working of the combustor in a relatively wide working condition range is guaranteed.

Description

technical field [0001] The invention relates to the field of low-pollution combustion of aero-engines, in particular to a head of a swirl combustion chamber with a variable inlet section. Background technique [0002] With the rapid development of the aviation industry, the impact of aero-engine exhaust emissions on the environment is becoming more and more obvious. The pollutants produced by the combustion of aero-engines are mainly carbon oxides (such as CO 2 , CO), nitrogen oxides (such as NO 2 , NO), sulfide (SO 2 ), unburned hydrocarbons (UHC), fly ash, smoke, etc. These pollutants not only have a great impact on human beings, but also affect the earth's temperature, humidity, animal and plant growth, etc. With my country's demand for large aircraft and increasingly stringent pollution emission standards, aircraft engine combustion chamber technology with low pollution emissions and high-efficiency combustion is particularly important. The International Civil Aviati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23R3/58
CPCF23R3/58
Inventor 张群杨福正刘强李程镐曹婷婷王鑫张鹏海涵
Owner NORTHWESTERN POLYTECHNICAL UNIV
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