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A numerical study of the influence of transport properties of inert diluents on soot formation in a coflow laminar ethylene/air diffusion flame

机译:惰性稀释剂传输特性对同流层流乙烯/空气扩散火焰中烟灰形成影响的数值研究

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摘要

The influence of transport properties of inert additives on soot formation in a coflow axisymmetric ethylene/air diffusion flame has been numerically investigated. Detailed reaction mechanism and complex thermal and transport properties were used. The fully coupled elliptic equations were solved. The radiative heat transfer from CO, CO2, H2O and soot was calculated using the discrete-ordinates method coupled with a SNBCK-based wide-band model. A simplified two-equation soot model was used. The interactions between the soot and gas-phase chemistry were taken into account. The effects of adding argon and helium to either the fuel or the oxidant were determined. The results show that the effects of argon and helium addition on soot formation process in a laminar ethylene/air diffusion flame are different because of the difference in their transport properties. When they are added to the fuel, argon is found to be more efficient at suppressing soot formation than helium due to the temperature difference caused by the different thermal diffusivities. However, when they are added to the coflow air, it is found that although both temperature and concentration modifications cause helium to be more efficient at suppressing soot formation than argon, it is the temperature modification that is more significant.
机译:数值研究了惰性添加剂的传输性能对共流轴对称乙烯/空气扩散火焰中烟灰形成的影响。使用了详细的反应机理以及复杂的热和输运性质。求解了完全耦合的椭圆方程。使用离散坐标法和基于SNBCK的宽带模型相结合,计算了从CO,CO2,H2O和烟灰中产生的辐射热传递。使用简化的两方程烟灰模型。考虑了烟灰和气相化学之间的相互作用。确定了向燃料或氧化剂中添加氩气和氦气的效果。结果表明,在层状乙烯/空气扩散火焰中,添加氩和氦对烟灰形成过程的影响是不同的,这是因为它们的传输特性不同。当将它们添加到燃料中时,由于由不同的热扩散率引起的温度差,发现氩比氦在抑制烟灰形成方面更有效。然而,发现当将它们加入到同流空气中时,尽管温度和浓度的改变都使氦气比氩气更有效地抑制烟灰的形成,但温度改变更为重要。

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