Numerical assessment of subgrid scale models for scalar transport in large-eddy simulations of hydrogen-enriched fuels
Numerical assessment of subgrid scale models for scalar transport in large-eddy simulations of hydrogen-enriched fuels
复制标题
DOI：
10.1016/j.ijhydene.2014.03.018
复制
发表时间：
2014-05
影响因子：
7.2
通讯作者：
D. Martinez;Xi Jiang;C. Moulinec;D. Emerson
中科院分区：
文献类型：
--
作者：
D. Martinez;Xi Jiang;C. Moulinec;D. Emerson
对大涡模拟中标量输运的两种不同模型进行了比较，分别针对无反应射流和实验火焰。在富氢非反应燃料射流和火焰燃烧富氢混合物的情况下，将基于梯度扩散封闭的简单方法与线性涡流模型进行了比较。结果表明，梯度扩散模型不能作为含氢混合物大涡模拟的亚网格模型。它产生的非物理标量场具有不切实际的温度分布。基于线性涡动模型的方法可以用来获得标量场的适当表示，以及对标量输运和温度场的更准确的预测。
A comparison of two different models addressing the scalar transport in large-eddy simulations is conducted for a non-reacting jet and an experimental flame. A simple approach based on a gradient diffusion closure is compared against the linear-eddy model in the context of hydrogen-enriched non-reacting fuel jets and flames burning hydrogen-enriched mixtures. The results show that the gradient diffusion model is not valid as a subgrid scale model for large-eddy simulations of mixtures containing hydrogen. It produces unphysical scalar fields with unrealistic temperature distributions. Approaches based on the linear-eddy model can be used instead to obtain appropriate representation of the scalar field and more accurate predictions of the scalar transport and the temperature field.