A lean-fuel premixed pre-evaporative low-pollution combustor with main-stage fuel direct injection

Abstract

The invention relates to a lean oil pre-mixing and pre-evaporating low-pollution combustion chamber capable of ejecting main-stage fuel oil directly, and belongs to the field of aero-engines. The core idea of the lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is air classification and fuel oil classification. The lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is composed of an on-duty stage / subsidiary mold and a mainstage / main mold, wherein the on-duty stage is composed of a first-stage axial swirler (8), a second-stage axial swirler (9), a sleeve (10) and an on-duty stage contraction and expansion segment (20), realizes diffusive combustion and provides a stable ignition source; and the main stage comprises a main-stage swirler (11), a main-stage oil supply pipe (15), an oil collection cavity (16), a fuel oil direct-injection type nozzle (17), a main-stage contraction and expansion segment (12) and a main-stage pre-mixing annular cavity (22) and is used for combusting a part of pre-mixed and pre-evaporated lean oil and lowering a high-temperature hotspot so as to reduce the emission of thermal nitric oxide (NOX). The lean oil pre-mixing and pre-evaporating low-pollution combustion chamber is in the mode of lean oil pre-mixing and pre-evaporating combustion with a central classification idea, other properties of the chamber cannot be sacrificed, and the emission of pollutants, including the NOX, smoke, carbon oxide (CO) and unburned hydrocarbon (UHC), of an aero-engine chamber can be effectively lowered at the same time.

Description

technical field [0001] The invention relates to a low-pollution combustion chamber of lean oil premixing and preevaporation with direct injection of main-stage fuel oil, and belongs to the technical field of aero-engines. Background technique [0002] At present, the pollutants emitted by civil aviation engines into the atmosphere are increasing day by day, and the air pollution is becoming more and more serious. In order to control the impact of aircraft engine emissions on the environment, the pollutant emissions from the combustion chambers of civil aircraft are required to meet the ICAO CAEP standards of the International Civil Aviation Organization. The current implementation is CAEP6, especially for NO X Emission requirements are getting stricter. In order to meet CAEP standards, major aero-engine companies and research institutions have carried out research on low-polluting combustion technology. GE has developed Twin Annular Premixing Swirler (TAPS) combustion techn...

AI Technical Summary

Problems solved by technology

[0003] The main combustion chamber of traditional military aircraft adopts diffusion combustion. Under 100% working conditions, the oil-gas ratio in the main combustion zone is designed for a chemically appropriate oil-gas ratio, and the combustion efficiency is high. However, the temperature of the gas in the main combustion zone is very high, so a large amount of thermal energy will be generated. NOx; while in slow running conditions, the combustion efficiency is low and the combustion is incomplete, so the pollutants CO and UHC are generated more

Therefore, the conventional diffusion combustion method is difficult to meet the current or future low pollution emission requirements

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