Numerical simulations of turbulent jet flames with non-premixed combustion of hydrogen-enriched fuels
Numerical simulations of turbulent jet flames with non-premixed combustion of hydrogen-enriched fuels
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DOI：
10.1016/j.compfluid.2013.03.016
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发表时间：
2013-12
影响因子：
2.8
通讯作者：
D. Martinez;Xi Jiang;C. Moulinec;D. Emerson
中科院分区：
文献类型：
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作者：
D. Martinez;Xi Jiang;C. Moulinec;D. Emerson
对氢气和合成气火焰的湍流燃烧过程进行了大涡模拟。亚格子尺度的动量输送采用一方程模型，采用亚格子尺度的湍流动能，标量输送采用线性涡动模型。简化的化学动力学被用来描述火焰化学，扩展的Zeldovich机理解释了NOx的热形成。结果表明，氢含量和雷诺数对火焰特性有较大影响。较高的氢含量有助于增加燃烧后释放的热，导致较高的温度峰和较厚的剪切层。燃料流中CO的存在会影响火焰动力学，形成更具涡旋和褶皱的流场。文中还讨论了涡量场和湍流/化学相互作用。给出了标量分布，并与实验数据进行了比较，其中观察到了合理的一致。
Large-eddy simulation is conducted to study the turbulent combustion processes of hydrogen and syngas flames. The subgrid scale momentum transport is performed with a one-equation model using the subgrid scale turbulent kinetic energy, while the linear-eddy model is employed to represent the scalar transport. Reduced chemical kinetics is used to describe the flame chemistry with the extended Zeldovich mechanism to account for the thermal formation of NOx. Results show the effects of the hydrogen content and of the Reynolds number on the characteristics of the flames. Higher hydrogen content contributes to increase the heat released after combustion leading to higher temperature peaks and thicker shear layers. The presence of CO in the fuel stream affects the flame dynamics with the development of a more vortical and wrinkled flow field. The vorticity field and turbulence/chemistry interactions are also discussed. Scalar profiles and comparison against experimental data are presented where a reasonable agreement is observed.