Low-pollution combustion chamber adopting forced diversion at main-combustion-stage outlet

Abstract

Provided is a low-pollution combustion chamber adopting forced diversion at a main-combustion-stage outlet. The emission level of LTO circulating pollutants can be lowered, and the ignition performance of the combustion chamber is improved. A fuel nozzle supplies all fuel to the combustion chamber, main-combustion-stage fuel is sprayed into an inner channel of a main-combustion-stage pre-film plate, part of fuel forms main-combustion-stage straight spray oil mist, part of fuel is sprayed to the main-combustion-stage pre-film plate to form an uniform oil film, breaking and atomization are conducted under the two-path rotational flow shear effect of the pre-film plate inner channel and a pre-film plate outer channel to from main-combustion-stage pneumatic atomized oil mist, the oil mist and the air are mixed to form an uniform oil-air mixture, and the oil-air mixture enters a flame tube for pre-mixing combustion; and a main-combustion-stage outlet diversion ring is mounted at the main-combustion-stage outlet, the longitudinal section of the outer side of the outlet diversion ring is in a smooth arc line, the arc line is inward in the radial direction and extends forwards in the axial direction, the radial height of the arc line is not larger than 1 / 2 of the penetration depth of the main-combustion-stage straight spray oil mist so that the main-combustion-stage air flow can form expanding flowing, and a full center backflow region is formed.

Description

technical field [0001] The invention relates to a combustion chamber of a gas turbine, in particular to a low-pollution combustion chamber of an aero-engine. Background technique [0002] The main development trend of modern civil aeroengine combustors is low-pollution combustion. Combustion chambers of civil aeroengines must meet increasingly stringent aeroengine pollution emission standards. The currently adopted CAEP6 (Committee on Aviation Environmental Protection) standard has very strict regulations on pollutant emissions, especially for NOx pollution emission requirements; and the latest CAEP8 standard proposes to reduce NOx emissions by 15% on the CAEP6 emission standard, With the rapid development of the aviation industry and the continuous improvement of people's awareness of environmental protection, higher requirements will be put forward for the pollution emissions of gas turbine combustors in the future. [0003] American companies GE and PW have already star...

AI Technical Summary

Problems solved by technology

In the small state, the equivalence ratio of the combustion zone is very low, far below the equivalence ratio range required for low-pollution combustion. At this time, although NOx emissions are low, CO and UHC emissions are high

In addition, because the conventional combustion chamber generally adopts the diffusion combustion method, the local equivalence ratio is not uniform, so for the conventional combustion chamber, it cannot meet the low pollution requirements in the entire engine operating range

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