Special-shaped nozzles for main-stage oil supply of lean-fuel premixed pre-evaporated low-pollution combustors

Abstract

The invention relates to a special-shaped nozzle for the main-stage oil supply of a lean-oil premixed pre-evaporation low-pollution combustion chamber, which belongs to the field of gas turbine combustion; the invention sets a special-shaped nozzle hole in the air flow channel of the main-stage swirler to form a main-stage oil supply nozzle. Oil direct injection special-shaped nozzles; the special-shaped nozzles are evenly distributed along the circumferential direction of the main swirler to form a uniformly distributed fuel space distribution in the circumferential direction, increase the contact area between fuel and air, improve the mixing effect of oil and gas, and improve the uniform distribution of fuel It can reduce the local high temperature zone caused by fuel enrichment after the main injection hole, thereby effectively reducing the generation of NOx, CO and other pollutants. By changing the fuel jet penetration depth, jet direction and jet circumferential expansion angle of the main-stage direct injection nozzle hole, the effect of adjusting the temperature uniform distribution downstream of the main-stage nozzle hole is achieved, and the generation of NOx, CO and other pollutants is reduced.

Description

technical field [0001] The invention belongs to the field of combustion of gas turbines, and in particular relates to a special-shaped nozzle used for the main-stage oil supply of lean oil premixed pre-evaporation low-pollution combustion chambers. Background technique [0002] At present, civil aviation engines emit more and more pollutants into the atmosphere, and the air pollution is also becoming more and more serious. In order to control the impact of aircraft engine emissions on the environment, the pollution emissions from civil aircraft combustion chambers are required to meet the ICAO CAEP standards, and NO X Emissions requirements are getting stricter. At present, lean oil premixed pre-evaporation low-pollution combustion technology is often used in civil aeroengine combustors to reduce NO X emission. In the lean fuel premixed pre-evaporative combustion chamber, fuel and air are combusted in stages and zones to achieve the goal of low pollution emissions. The ma...

AI Technical Summary

Problems solved by technology

In the lean fuel premixed pre-evaporative combustion chamber, fuel and air are combusted in stages and zones to achieve the goal of low pollution emissions. The main stage fuel is directly injected with direct injection nozzles, and the traditional direct injection nozzles are all regular circles. Insufficient jet penetration depth of holes and circular holes, poor atomization effect of direct injection nozzles, and uneven distribution of fuel space in the circumferential direction of the main stage swirler, insufficient mixing of oil and gas, fuel enrichment will occur downstream of each circular hole injection point area, leading to the formation of a local high-temperature area at the outlet of the main stage, resulting in an increase in the generation of pollutants NOx

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