Tabulated Chemistry Approach for the Simulation of MILD Combustion: Effects of Scalar Mixing and Chemistry Tabulation.
Tabulated Chemistry Approach for the Simulation of MILD Combustion: Effects of Scalar Mixing and Chemistry Tabulation.
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DOI：
10.1021/acsomega.2c07850
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发表时间：
2023-03-21
期刊：
影响因子：
4.1
通讯作者：
Cheong, Kin-Pang
中科院分区：
文献类型：
--
作者：
Hu, Yong;Jiang, Yong;Cheong, Kin-Pang
中度和强烈低氧稀释燃烧是一种非常有前途的清洁和高效的热能输送技术。然而，由于其非常规的反应性质，在各种工业燃烧器中的MILD燃烧的优化仍然是具有挑战性的，其中基于精确和成本效益的数值模拟的设计工具是最理想的。为此，表列化学方法（TCA）进行了全面评估，通过模拟的阿德莱德射流在热气流（JHC）燃烧器的MILD燃烧的建模。考虑标量微观混合和规范火焰配置（即，火焰和PSR为基础的反应器），是相关的MILD制度的特点，在TCA进行了研究。结果发现，标量混合增强，通过动态调整模型参数Cs导致一个改进的预测，并确定了当前火焰的最佳值Cs = 8。TCA中详细化学结构的适当参数化被发现会影响MILD火焰轮廓的准确预测，特别是次要物种的质量分数（例如，OH，CO）。此外，O + C_2H_2 → CO + CH_2的吸热反应路径是导致CO预测差异的主要原因。这意味着，在复杂的MILD燃烧的多个反应制度，应占通过使用小火焰或PSR结构，取决于当地的微尺度扩散/化学竞争。总的来说，结果突出了多尺度混合的影响作用和它的相互耦合与有限速率化学，准确地确定这是重要的MILD燃烧建模。
MILD (moderate and intense low-oxygen dilution) combustion is a highly promising technology to deliver clean and efficient thermal energy. However, because of its unconventional reaction nature, the optimization of the MILD combustion in various industrial burners is still challenging, for which the design tool based on accurate and cost-effective numerical simulation is most desirable. To this end, the tabulated chemistry approach (TCA) is thoroughly assessed for the modeling of MILD combustion by simulations of the Adelaide Jet in Hot Coflow (JHC) burner. The sensitivities to the submodel accounting for the scalar micromixing and the canonical flame configurations (i.e., flamelet and PSR-based reactors), being relevant for MILD regime characterization in TCA, are studied. It is found that the scalar mixing enhanced through the dynamic adjustment of model parameter Cs leads to an improved prediction, and the optimal value of Cs = 8 is identified for the current flames. The proper parametrization of the detailed chemical structures in TCA is found to affect the accurate prediction of the MILD flame profiles, especially the mass fraction of minor species (e.g., OH, CO). Furthermore, the endothermic reaction path of O + C2H2 ⇒ CO + CH2 is indicated as the main contributing step to the disparities in the CO predictions. This implies that the multiple reaction regimes in complex MILD burning should be accounted for by the use of either flamelet or PSR structures, depending on the local microscale diffusion/chemistry competitions. Overall, the results highlight the influential role of multiscale mixing and its intercoupling with the finite-rate chemistry, the accurate determination of which is important for MILD combustion modeling.
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