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基于文丘里混合的多孔介质燃烧火焰数值模拟研究
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Abstract:
燃料/空气文丘里混合器在工业预混燃烧领域应用广泛，混合气体的均匀性对燃烧性能影响较大。为研究非均匀混合气体在多孔介质内的燃烧特点，本文对甲烷/空气经文丘里混合后预混不均匀度(spatial mixing deficiency, SMD)约为2%的非均匀预混气体在双层多孔介质燃烧器内的燃烧火焰进行了模拟。研究结果表明：受混合不均匀的影响，非完全预混气体在多孔介质内点火燃烧时容易产生局部高温而降低燃烧器的使用寿命；而达到稳定燃烧时，预混不均匀使得燃烧火焰稳定性降低。
The fuel/air Venturi mixer is widely used in the industrial premixed combustion. The uniformity of the mixed gas has a great influence on the combustion performance. In order to study the com-bustion characteristics of non-uniform mixed gas in porous media, this paper studied the me-thane/air non-uniform premixed gas after Venturi mixing and the Spatial Mixing Deficiency (SMD) is about 2%, when entering in the double-layer porous media burner. The research results show that: due to the influence of uneven mixing, non-premixed gas easily leads to local high tempera-ture when ignited and burned in the porous medium and reduces the service life of the burner. When stable combustion is achieved, due to the good thermal conductivity of porous medium, the local high temperature can be flattened, but flame stability becomes worse.
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