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首页> 外文期刊>Combustion Science and Technology >Effect of Swirl Strength on the Flow and Combustion Characteristics of Pulverized Biomass Flames
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Effect of Swirl Strength on the Flow and Combustion Characteristics of Pulverized Biomass Flames

机译：旋流强度对粉状生物质火焰流动和燃烧特性的影响

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摘要

This article reports on the effect of swirl intensity on the flow and combustion characteristics of pulverized olive waste (OW) burning. Numerical simulations are carried out using the computational fluid dynamics (CFD) Commercial Software "Fluent ANSYS14" by choosing appropriate model parameters. The biomass furnace consists of a vertical cylinder equipped with a swirling co-flow injection burner. The particles of pulverized biomass (OW) are injected transversally into the furnace just near the co-flow exit, via four square-shaped injection nozzles. The non-premixed combustion model with mixture fraction/PDF model for turbulence-chemistry interactions is used. Standard k-epsilon turbulence model closure, discrete phase model (DPM) for tracking the motion of individual particle and P-1 radiation model for flame radiation inside the combustor are used in the numerical simulation. Four different swirl numbers S-n = 0.38, 0.95, 1.2 and 1.42 are used in this study in order to investigate the swirl intensity effect on the flow and combustion behavior. The results showed that the flow and the flame characteristics such as axial velocity, streamlines, gas temperature, flame length and CO2, CO and O-2 concentrations are affected by the swirl intensity.
机译：本文报道了旋流强度对粉碎的橄榄废料（OW）燃烧的流动和燃烧特性的影响。通过选择适当的模型参数，使用计算流体动力学（CFD）商业软件“ Fluent ANSYS14”进行数值模拟。生物质炉由配备有涡旋同流喷射燃烧器的立式气缸组成。粉碎的生物质（OW）颗粒通过四个方形喷嘴直接向同流出口附近横向注入炉中。使用具有混合分数/ PDF模型的非预混燃烧模型来进行湍流-化学相互作用。在数值模拟中，使用了标准的k-ε湍流模型闭合，用于跟踪单个粒子运动的离散相模型（DPM）和用于燃烧器内部火焰辐射的P-1辐射模型。为了研究旋流强度对流动和燃烧行为的影响，在本研究中使用了四个不同的旋流数S-n = 0.38、0.95、1.2和1.42。结果表明，旋流强度会影响流动和火焰特性，例如轴向速度，流线，气体温度，火焰长度以及CO2，CO和O-2的浓度。

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