This work evaluates the capabilities of Large Eddy Simulation with perfectly stirred reactor (PSR) assumption and detailed chemistry to predict unsteady, premixed, hydrogen combustion sequences. The model was benchmarked with hydrogen-air experimental tests and with numerical data of flame acceleration in an obstructed channel. Results permit to identify major shortcomings that should be addressed with this approach and to assess the uncertainties linked to the use of different sub-models. Spatial resolution was found to be critical and limits the applications of this approach due to the increase of the computational costs with the flame surface. While the influence of the detailed kinetic chemical scheme used was low, the impact of the sub-grid turbulence model used was high. Results showed that simulations provided good agreement with the experimental data when a minimum spatial resolution of 1/8 of the laminar flame thickness was imposed. This threshold permits to simulate with good results the early stages of the combustion sequence (ignition and initial flame acceleration) but limits the model applications when the flame surface increases. In-situ Adaptive Tabulation (ISAT) was an effective strategy to overcome the limitations and partially reduce the computational cost when detailed chemistry models are used together with PSR-LES.

这项工作通过完美搅拌反应器 (PSR) 假设和详细化学来评估大涡模拟的能力，以预测不稳定的、预混的氢燃烧序列。该模型以氢气-空气实验测试和受阻通道中火焰加速的数值数据为基准。结果允许确定应该用这种方法解决的主要缺点，并评估与使用不同子模型相关的不确定性。空间分辨率被发现是至关重要的，并且由于火焰表面的计算成本增加而限制了这种方法的应用。虽然使用的详细动力学化学方案的影响很小，但使用的子网格湍流模型的影响很大。结果表明，当施加 1/8 层流火焰厚度的最小空间分辨率时，模拟与实验数据非常吻合。该阈值允许在燃烧序列的早期阶段（点火和初始火焰加速）以良好的结果进行模拟，但在火焰表面增加时限制了模型应用。当详细的化学模型与 PSR-LES 一起使用时，原位自适应制表 (ISAT) 是克服限制并部分降低计算成本的有效策略。该阈值允许在燃烧序列的早期阶段（点火和初始火焰加速）以良好的结果进行模拟，但在火焰表面增加时限制了模型应用。当详细的化学模型与 PSR-LES 一起使用时，原位自适应制表 (ISAT) 是克服限制并部分降低计算成本的有效策略。该阈值允许在燃烧序列的早期阶段（点火和初始火焰加速）以良好的结果进行模拟，但在火焰表面增加时限制了模型应用。当详细的化学模型与 PSR-LES 一起使用时，原位自适应制表 (ISAT) 是克服限制并部分降低计算成本的有效策略。