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Physics of Methane Combustion in Mixing Shear Layer

机译：混合剪切层中甲烷燃烧的物理学

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摘要

A 2-dimensional numerical analysis of unsteady diffusive combustion with methane as the fuel and oxygen as the oxidizer was performed, focusing on (a) the physics of complicated mixing and combustion, and (b) the influence of heat release on mixing. The computational domain is a square surrounded by (ⅰ) adiabatic and free-slip boundaries, and (ⅱ) flux-periodic boundaries. Each of nitrogen-diluted methane and nitrogen-diluted oxygen is injected with Reynolds number 1,000 from a periodic boundary to the opposite direction, where (a) the upper right-going high-temperature methane layer and (b) the lower left-going high-temperature oxygen layer interact and get mixed due to vortical entrainment and molecular diffusion. Applying the direct numerical simulation (DNS) method (second-order accurate in time, fourth-order in space, and maximum mesh Reynolds number =15) to such a temporally-growing counter shear layer, important information characterizing the reactive mixing layer, such as temporal change of vortex structure due to heat release, is obtained. At an early stage of vortical structure change, initially-existing 2 large-scale vortices, which correspond to the fundamental perturbation frequency, split into 4, due to thermal expansion and baroclinic effect. At a later stage, however, the baroclinic effect within the reaction zone plays a dominant role to promote the structure change, locally intensifying or weakening the vorticity.
机译：进行了以甲烷为燃料，氧气为氧化剂的非稳态扩散燃烧的二维数值分析，重点是（a）复杂的混合和燃烧的物理过程，以及（b）放热对混合的影响。计算域是由（ⅰ）绝热和自由滑移边界以及（ⅱ）通量周期边界包围的正方形。从周期边界向相反的方向分别向氮稀释的甲烷和氮稀释的氧气注入雷诺数1,000，其中（a）右上方的高温甲烷层和（b）左下方的高温甲烷层高温氧层由于旋涡夹带和分子扩散而相互作用并混合。将直接数值模拟（DNS）方法（时间二阶精度，空间四阶精度和最大网格雷诺数= 15）应用于这种随时间增长的反剪切层，这是表征反应混合层的重要信息，例如获得由于热量释放引起的涡旋结构随时间的变化。在涡旋结构变化的早期，由于热膨胀和斜压效应，最初存在2个与基本摄动频率相对应的大型涡旋，分为4个。然而，在稍后阶段，反应区内的斜压效应起着主导作用，以促进结构变化，局部增强或减弱涡度。

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