Aerial engine lean premixed preevaporated low contamination combustion chamber

Abstract

An aero-engine lean-oil premixed pre-evaporation low-pollution combustor consists of a head and a flame tube, the combustion gas is all supplied from the head of the combustor, and the cooling gas and mixed gas enter from the flame tube; the head is The double-ring cavity structure is divided into two stages, the pre-combustion stage and the main combustion stage. The pre-combustion stage is included, and the main combustion stage surrounds the pre-combustion stage. The pre-combustion stage includes a centrifugal nozzle and a swirler surrounding the centrifugal nozzle. After being sprayed out from the centrifugal nozzle, the fuel is sheared and broken by the air swirl from the swirler, mixed in the mixing chamber area of ​​the pre-combustion stage and then enters the combustion area Diffusion combustion is formed inside; the main combustion stage includes a direct air atomizing nozzle, a main swirler and a premixing ring chamber, the main swirler is located upstream of the nozzle, and the premixing ring chamber is located downstream of the nozzle, and the fuel goes first in the nozzle It is mixed and atomized with air, and then tangentially injected into the premixed ring cavity for premixed pre-evaporation, and enters the combustion area to form premixed combustion; in the downstream of the pre-combustion stage combustion and main combustion stage fuel outlets, contraction and expansion ports are used to prevent backflow fire and carbon buildup. The invention has a simple structure and can effectively reduce the pollution discharge of the aero-engine under the condition of ensuring the working state.

Description

technical field [0001] The present invention relates to an aero-engine lean fuel premixed pre-evaporation low-pollution combustor. The aero-engine combustor designed according to the invention has a simple structure, and can effectively reduce the combustion rate of the aero-engine while ensuring the stable and efficient operation of the combustor. pollutant emissions. Background technique [0002] The main development trend of aero-engine combustors is low-pollution combustion to meet the increasingly stringent aero-engine pollution emission standards. The requirements of the currently adopted CAEP4 standard can be said to be quite strict, while the CAEP6 standard to be adopted after 2008 will be even more stringent, its NO X Emissions are 60% lower than the average level of today's engines. And only making some improvements to the structure of the existing conventional engine combustion chamber, it is impossible to reach the exhaust pollution standard. Therefore, a new ...

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Problems solved by technology

In addition, the current conventional combustion adopts the diffusion combustion method, and the local equivalent ratio is very uneven. Therefore, it is difficult to meet the requirements of low-pollution combustion.

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