Lean oil direct injection and mixing low-pollution combustion chamber

Abstract

The invention relates to a lean oil direct injection and mixing low-pollution combustion chamber. The lean oil direct injection and mixing low-pollution combustion chamber is composed of a diffuser, acombustion chamber outer case, a combustion chamber inner case, a combustion chamber head, a flame tube outer wall and a flame tube inner wall, wherein combustion air all enters a flame tube from thecombustion chamber head; the combustion chamber head is divided into an on-duty grade and a main combustion grade through a grading and partitioning combustion strategy; the on-duty grade and the main combustion grade both adopt a direct injection and mixing combustion method, the phenomena of spontaneous combustion and tempering are effectively avoided, and the risk of occurrence of oscillationcombustion is lowered; the lean oil direct injection and mixing low-pollution combustion chamber only works in an on-duty grade mode under an idling rating state, the designed partial equivalence ratio is higher, and the work stability of the combustion chamber is guaranteed; and with the increase of the work state of the combustion chamber, the main combustion grade is opened gradually, the maincombustion grade and the on-duty grade work simultaneously under a large state, the designed combustion area average equivalence ratio is lower, the average temperature of the combustion area is effectively lowered, and therefore the generation quantity of pollutants is lowered.

Description

technical field [0001] The invention belongs to the field of low-pollution combustion chambers, and relates to a lean oil direct injection and mixed low-pollution combustion chamber. Background technique [0002] In recent years, the international community has paid more and more attention to environmental protection issues. Although the pollutant emissions of aero-engines account for a small proportion of the total environmental pollution emissions, high-altitude pollutants mainly come from aero-engines. Therefore, CAEP, the Environmental Protection Committee of ICAO, has formulated a series of standards to strictly regulate the emissions of CO, UHC and NOx from civil aircraft engines. Only engines that meet the emission requirements can obtain airworthiness certification. Therefore, it is necessary to vigorously develop low-pollution combustion technology to reduce the emission level of aero-engine pollutants, so as to meet the higher emission requirements now and in the f...

AI Technical Summary

Problems solved by technology

At present, domestic low-pollution combustors widely adopt the staged combustion strategy, and the main combustion stage generally adopts the premixed pre-evaporation combustion method. Under the existing engine working conditions, this is indeed a very effective method for reducing pollutants. However, with the In the future, the working state of the engine will be greatly improved, and the inlet temperature and inlet pressure of the combustion chamber will increase significantly. The use of premixed and pre-evaporation methods will bring backfire and spontaneous combustion risks, and may cause serious combustion instability problems. Therefore, for future civil aviation The working state of the engine urgently needs a low-pollution combustion chamber that can not only ensure the stable operation of the combustion chamber, but also meet the pollution emission requirements.

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