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EFFECTS OF SORET DIFFUSION ON PREMIXED COUNTERFLOW FLAMES

机译:泥浆扩散对过盈逆流火焰的影响

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Soret diffusion is a secondary mass diffusion and it affects laminar flames with very light or heavy species and large temperature gradients. To get a general understanding of Soret effects on stretched flames, we conduct theoretical analysis on a premixed counterflow flame with Soret diffusion. A deliberately idealized premixed counterflow flame model is analyzed asymptotically within the framework of large activation energy, potential flow, and thermal-diffusive model. A correlation among flame stretch rate, flame position, and flame temperature is derived and is used to assess the effects of Soret diffusion on counterflow flame structure, Markstein length, and extinction stretch rate. Results show that Soret diffusion quantitatively affects the premixed counterflow flame and that the influence of Soret diffusion strongly depends on Lewis number and stretch rate. For light fuels, the premixed counterflow flame becomes stronger after including Soret diffusion. The opposite trend occurs for heavy fuels. The influence of Soret diffusion is found to increase with the stretch rate. A linear change between normalized Markstein length and Soret diffusion coefficient is observed, indicating that flame becomes more sensitive to stretch rate after including Soret diffusion. Furthermore, Soret diffusion is shown to greatly increase the extinction stretch rate of light fuels. These results indicate that for highly-stretched premixed flames containing very light species, the impact of Soret diffusion cannot be neglected.
机译:索雷特扩散是次要的质量扩散,它会影响具有非常轻或重物种和大温度梯度的层流火焰。为了大致了解Soret对拉伸火焰的影响,我们对具有Soret扩散的预混逆流火焰进行了理论分析。在大的活化能,势能流和热扩散模型的框架内,渐近分析了故意理想化的预混合逆流火焰模型。得出了火焰拉伸速率,火焰位置​​和火焰温度之间的相关性,并用于评估Soret扩散对逆流火焰结构,Markstein长度和消光拉伸速率的影响。结果表明,Soret扩散对定量混合的逆流火焰有定量的影响,Soret扩散的影响在很大程度上取决于Lewis数和拉伸速率。对于轻质燃料,包括Soret扩散后,预混合的逆流火焰变得更强。对于重质燃料则出现相反的趋势。发现Soret扩散的影响随着拉伸速率而增加。观察到归一化的Markstein长度和Soret扩散系数之间存在线性变化,这表明在包括Soret扩散后,火焰对拉伸速率变得更加敏感。此外,Soret扩散可显着提高轻质燃料的消光拉伸速率。这些结果表明,对于含有非常轻的物质的高拉伸预混火焰,Soret扩散的影响不可忽略。

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