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首页> 外文会议>MIT Conference on Computational Fluid and Solid Mechanics >Direct numerical simulation of turbulent premixed flame interaction using parallel computing
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Direct numerical simulation of turbulent premixed flame interaction using parallel computing

机译：平行计算的湍流预混火焰交互的直接数值模拟

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Upstream interaction of hydrogen-air premixed flames in homogeneous turbulent flow fields is simulated by direct numerical simulation with detailed chemistry. The computations were performed on a SGI Origin 2000 system with a MPP DNS code demonstrating scalable parallelism using MPI. The effect of a varying fuel/air equivalence ratio on flame interaction was accounted for by simulating asymmetric lean-rich flame interaction and symmetric rich-rich flame interaction. As the two flames approach one another turbulence interacts with the flame fronts causing various degrees of flame corrugation. Each case was run until the two flames nearly burn out all the reactants in between. The results show that the local flame front response to turbulence is consistent with previous understanding of laminar premixed flames, in that the flame strength tends to be intensified where the flame curvature is concave towards the fresh mixture. This trend is maintained even with lean premixed flame stoichiometries, whose diffusive-thermal imbalance appears to be neutral due to the competing effects of fast-diffusing species, H{sub}2 and H-atom. The overall burning rate is also monitored in time by integrating the reactant consumption and heat release rates throughout the computational domain. The overall heat release is monotonically increasing in time due to the enhanced surface area as a result of turbulent straining and wrinkling. On the other hand, the overall consumption rate of both fuel and oxygen shows a nonmonotonic response, where the consumption rate decreases during the severe interaction of the two flames resulting in a 'burn-out' of some flame segments. Finally, during mutual flame annihilation notable radical superequilibrium bursts are observed.
机译：的氢气 - 空气上游相互作用预混均质紊流场的火焰是通过用化学详细直接数值模拟仿真。该计算是用MPP DNS代码演示使用MPI并行可扩展性SGI一个起源2000系统上执行。上火焰相互作用的变化的燃料/空气当量比的效果通过模拟不对称富稀火焰相互作用和对称富富火焰相互作用占。由于两个火焰接近一个与火焰前缘引起不同程度的火焰波纹的另一个动荡相互作用。每一种情况下运行，直到两个火焰几乎烧毁了所有的反应物之间。结果表明，当地的火焰正面回应湍流与层流预混火焰的谅解，在火焰强度趋于激化，其中火焰曲率走向新鲜混合凹一致。这种趋势甚至与贫油预混火焰的化学计量，其扩散热不平衡似乎是中性由于快速扩散物种的竞争效应，H {}子2和H-原子保持。总的燃烧速度也由整个计算域整合反应消耗和热释放速率监测的时间。总热释放单调时刻由于增强表面积为湍流束紧和起皱的结果增加。在另一方面，两种燃料和氧气示出了整体的消耗速率的非单调响应，其中导致两个火焰的严重交互期间的消耗率降低的“烧尽”一些火焰段。最后，相互湮灭火焰中显着的激进superequilibrium突发观察。

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