Large-eddy simulation of equilibrium plasma-assisted combustion in supersonic flow
Large-eddy simulation of equilibrium plasma-assisted combustion in supersonic flow
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DOI：
10.1016/j.proci.2008.06.131
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Miki;J. Schulz;S. Menon
中科院分区：
文献类型：
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作者：
K. Miki;J. Schulz;S. Menon
具有磁流体动力学 (MHD) 方程的新局部动态子网格闭合的大涡模拟 (LES) 模型用于研究超音速流中的等离子体辅助燃烧。使用 16 种物质和 74 个反应的动力学模型来模拟氢气-空气燃烧和高温空气离解。该数值模型通过后向台阶上的非反应和反应超音速流的实验数据进行了验证。研究表明，台阶角附近等离子体源的产生对高温区域具有强烈的局部效应，导致混合区域中自由基物质浓度的增加。这具有增强燃烧的潜力。此外，下游燃料-空气混合得到改善，主要是通过在等离子体源的近场中产生强大的斜压扭矩效应。此外，通过添加均匀的外部磁场，洛伦兹力效应可提升剪切层并将燃料渗透率提高约 20%，从而有助于进一步增强混合。
A large-eddy simulation (LES) model with a new localized dynamic subgrid closure for the magnetohydrodynamics (MHD) equations is used to investigate plasma-assisted combustion in supersonic flow. A 16-species and 74-reactions kinetics model is used to simulate hydrogen-air combustion and high-temperature air dissociation. The numerical model is validated with experimental data for non-reacting and reacting supersonic flow over a rearward-facing step. The creation of a plasma source near the step corner is shown to have a strong localized effect with the high temperature region resulting in an increase of the radical species concentration in the mixing region. This has the potential for enhancing combustion. In addition, downstream fuel–air mixing is improved, primarily by the creation of a strong baroclinic torque effect in the near field of the plasma source. Furthermore, by adding an uniform external magnetic field, the Lorentz force effect helps to further enhance mixing by lifting the shear layer and increasing fuel penetration by approximately 20%.