Combustor fuel injection and mixing device

Abstract

Disclosed is a combustor fuel injection and mixing device. A main combustion level, a middle combustion level, and a pre-combustion level are sequentially arranged from outside to inside of the combustor fuel injection and mixing device. Fuel respectively flows into oil pipelines of the main combustion level, the middle combustion level and a pre-combustion level through a main combustion level oil inlet hole, a middle combustion level oil inlet hole and a pre-combustion level oil inlet hole. The fuel in the oil pipelines are injected into a main combustion level channel, a middle combustion level channel and a pre-combustion level channel through a main combustion level nozzle, a middle combustion level nozzle and a pre-combustion level nozzle. The main combustion level nozzle is a pre-film type nozzle. Wall surface of two sides of the main combustion level nozzle is an assembling surface for assembling. The main combustion level oil pipe after a curve section is gradually expanded into a slit to enable the fuel in the main combustion level oil pipeline to form a layer of oil film behind the outer side wall of the main combustion level nozzle. Swirler components capable of shearing and atomizing the fuel injected into the main combustion level channel under the act of swirling are arranged around the main combustion level nozzle. The combustor fuel injection and mixing device is capable of improving mixture evenness of fuel and gas in the main combustion level and further improving temperature distribution of the outlet of the combustor.

Description

technical field [0001] The invention relates to the field of power devices, in particular, to the improvement of fuel devices in combustion chambers of aero-engines. Background technique [0002] As atmospheric environmental issues receive more and more attention around the world, the low emission requirements of various power devices are also paid more and more attention. This is especially true for aero engines, where NOx emission requirements are reduced by 50% compared to existing engines in today's emission requirements. [0003] It has been proved by research that the emission of NOx increases gradually with the increase of local temperature, and with the increase of temperature, the increase rate of emission of NOx increases. It is known through experiments that when the temperature is higher than 1900K, the increase in temperature will lead to a sharp increase in NOx emissions. Therefore, controlling the gas temperature in the combustion chamber becomes the key to c...

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Problems solved by technology

[0004] In the prior art, one of the design concepts of the low-pollution combustor is to adopt the method of staged fuel supply and zoned combustion. The problem of uneven oil supply in the circumferential direction will affect the outlet temperature distribution of the combustion chamber and adversely affect the life of the hot end parts of the aero-engine

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