Aerial engine lean premixed preevaporated low contamination combustion chamber

Abstract

The invention provides an aerial engine lean-oil pre-mixing pre-evaporation low-pollution combustion chamber, which consists of a head and a flame tube. The burning gas is fully supplied from the head of the combustion chamber, while the cooling gas and the mixed gas enter from the flame tube. The head is in double-ring cavity structure and is divided into a pre-burning stage and a main-burning stage; the pre-burning stage is arranged inside, and the main burning stage surrounds the pre-burning stage. The pre-burning stage includes a centrifugal nozzle and a swirler surrounding the centrifugal nozzle. The fuel oil sprayed out of the centrifugal nozzle is cut and broken by the air vortex from the swirler, and is mixed in the mixing cavity of the pre-burning stage, and then the fuel oil enters into the burning area to form the dispersing burning. Moreover, the main burning stage includes a direct air atomizing nozzle, a main swirler and a pre-mixing ring cavity; wherein, the main swirler is positioned at the upper reach of the nozzle, while the pre-mixing ring cavity is positioned at the lower reach of the nozzle. The fuel oil is firstly mixed with the air and atomized in the nozzle, and then is tangentially sprayed into the pre-mixing ring cavity for pre-mixing pre-evaporation, and finally the fuel oil enters into the burning area to form pre-mixing burning. Besides, convergent-divergent opening is arranged at the lower reach of the fuel oil outlets of the pre-burning stage and the main burning stage so as to prevent the tempering and carbon deposition. With simple structure, the invention, in the condition of ensuring the working state, can effectively reduce the pollution exhaust of the aerialengine.

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 emission. 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 g...

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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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