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首页> 外文期刊>European Journal of Mechanical and Environmental Engineering >Effects of Time Scale Ratio in Turbulent Diffusion Flames Modelling
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Effects of Time Scale Ratio in Turbulent Diffusion Flames Modelling

机译：时间尺度比在湍流扩散火焰建模中的作用

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摘要

An enhanced modelling technique is developed for the prediction of turbulent diffusion flames. The species transport and mixing mechanism is considered as governed by its own scales. The scalar turbulence closure problem is solved using a two-equation scalar turbulence model based on the variance of the mixture fraction and its rate of dissipation. This eliminates the need for the questionable analogy concept and its subsequent constant time scale ratio assumption. The present paper describes the full modelling procedure: combustion modelling, turbulence closure and radiation modelling. A brief description of the numerical technique is given. The method is applied to the calculation of a 3D glass furnace model and shows promising features. More realistic levels of concentration are predicted. Comparison with experimental results shows good agreement.
机译：开发了一种增强的建模技术来预测湍流扩散火焰。物种的运输和混合机制被认为是由其自身的尺度决定的。基于混合分数的方差及其耗散率，使用两方程式标量湍流模型解决了标量湍流闭合问题。这消除了对可疑类比概念及其后续恒定时标比率假设的需求。本文描述了完整的建模过程：燃烧建模，湍流闭合和辐射建模。给出了数值技术的简要说明。该方法被应用于3D玻璃熔炉模型的计算，并显示出有希望的特征。可以预测更现实的浓度水平。与实验结果比较表明吻合良好。

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