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Modelling of Spray Flames with Doubly Conditional Moment Closure

机译:双重条件矩封闭的喷雾火焰建模

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摘要

Simulations of a pilot-stabilised flame in a uniformly dispersed ethanol spray are performed using a Doubly Conditional Moment Closure (DCMC) model. The DCMC equation for spray combustion is derived, using the mixture fraction and the reaction progress variable as conditioning variables, including droplet evaporation and differential diffusion terms. A set of closure sub-models is suggested to allow for a first, preliminary application of the DCMC model to the test case presented here. In particular, the DCMC model is used to provide complete closure for the Favre-averaged spray terms in the mean and variance equations of the conditioning variables and the present test case is used to assess the importance of each term. Comparison with experimental data shows a promising overall agreement, whilst differences are related to modelling choices.
机译:使用双重条件矩封闭(DCMC)模型对均匀分散的乙醇喷雾中的引燃稳定火焰进行了模拟。使用混合物分数和反应进程变量作为条件变量(包括液滴蒸发和微分扩散项),导出了喷雾燃烧的DCMC方程。建议使用一组封闭子模型,以允许将DCMC模型首先初步应用到此处介绍的测试案例中。特别是,DCMC模型用于为条件变量的均值和方差方程中的Favre平均喷雾项提供完全封闭,并且本测试案例用于评估每个项的重要性。与实验数据的比较表明总体前景良好,而差异与模型选择有关。

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