A priori direct numerical simulation assessment of MILD combustion modelling in the context of large eddy simulation
A priori direct numerical simulation assessment of MILD combustion modelling in the context of large eddy simulation
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大涡模拟背景下 MILD 燃烧模型的先验直接数值模拟评估
DOI：
10.1016/j.fuel.2023.130295
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发表时间：
2024
期刊：
影响因子：
7.4
通讯作者：
Awad H
中科院分区：
文献类型：
--
作者：
Awad H
对均质和分层混合气MILD燃烧的大涡模拟（LES）进行了过滤反应速率和Favre过滤标量耗散速率封闭的先验直接数值模拟（DNS）评估。结果表明，对于均匀混合气和分层混合气的MILD燃烧，用β函数可以很好地预测反应进程变量的概率密度函数。被动标量混合的标量耗散率封闭特性可能不适用于均质和分层混合气MILD燃烧。在这项研究中，不同的过滤反应速率封闭的预测进行了评估相对于DNS数据。涡耗散概念（EDC），涡破裂（EBU）模型，并SDR为基础的反应速率封闭雷诺平均的Navier-Stokes模拟已扩展到温和燃烧的LES的上下文中。SDR为基础的反应速率封闭捕获的定性行为，但过度预测过滤的反应速率均质和分层混合物MILD燃烧。基于EBU的反应速率和火焰表面密度（FSD）封闭没有捕捉到均质和分层混合物MILD燃烧的过滤反应速率的定性行为。相比之下，EDC模型与桥接功能，这确保渐近行为，显示了潜在的提供合理的预测过滤反应速率为广泛的过滤器宽度的情况下，在这里调查。
A priori Direct Numerical Simulation (DNS) assessment of the closures for the filtered reaction rate and the Favre-filtered scalar dissipation rate (SDR) for large eddy simulations (LES) of homogenous and stratified mixture MILD combustion has been performed. It has been found that the probability density function of the reaction progress variable can be adequately predicted using the beta function for both homogenous and stratified mixture MILD combustion. It has also been found that a scalar dissipation rate closure characteristic of passive scalar mixing may not be suitable for homogenous and stratified mixture MILD combustion. The predictions of different filtered reaction rate closures have been assessed with respect to DNS data in this study. The Eddy Dissipation Concept (EDC), Eddy-Break Up (EBU) model, and SDR-based reaction rate closures for Reynolds Averaged Navier-Stokes simulations have been extended for MILD combustion in the context of LES. The SDR-based reaction rate closure captures the qualitative behaviour but overpredicts the filtered reaction rate for both homogenous and stratified mixture MILD combustion. The EBU-based reaction rate and flame surface density (FSD) closures did not capture the qualitative behaviour of the filtered reaction rate for both homogenous and stratified mixture MILD combustion. By contrast, the EDC model with bridging functions, which ensures asymptotic behaviour, shows the potential to provide reasonable predictions of the filtered reaction rate for a wide range of filter widths in the cases investigated here.
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