Abstract This paper analyses a new gas-assisted pulverized coal combustion chamber, specially designed for the validation of numerical models under oxy-fuel atmospheres. For this purpose, an overall method is developed based on Large Eddy Simulation (LES) for oxy-fuel pulverized coal combustion chambers. One essential aspect of this is the embedding of a 4D Flamelet Generated Manifold (FGM) table coupled with an artificially thickened flame (ATF) model in the Euler-Lagrange (EL) framework. The four dimensions of the generated manifold represent the finite rate chemistry, mixing of volatiles, and char products and heat losses in the gas phase. Before the model is applied in the combustion chamber, its validity is demonstrated utilizing verification cases. Subsequently, the simulation results of the combustion chamber are validated and discussed with the help of the available measurement data. Operating points with increasing complexity are investigated, starting with a single-phase case that analyzes the reproduction of the assisting methane flame based on tabulated chemistry coupled with ATF. For the validation process, velocity fields from Particle Image Velocimetry (PIV) are used as well as flame positions from planar laser-induced fluorescence of the OH radical (OH-PLIF). Subsequently, operating conditions using different coal mass flows are investigated. To validate the flame stabilization mechanism, velocity data for the near burner region are available. Further examinations of the gas-assisted coal flame are carried out, in particular the influence of the coal particles on the flame stabilization mechanism is carried out.

中文翻译：

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使用列表化学法在氧燃料气氛下对实验室规模的气体辅助煤粉燃烧室进行大涡模拟

摘要 本文分析了一种新的气体辅助煤粉燃烧室，该燃烧室专为在氧燃料气氛下验证数值模型而设计。为此，基于大涡模拟 (LES) 开发了一种用于氧燃料粉煤燃烧室的整体方法。其中一个重要方面是在 Euler-Lagrange (EL) 框架中嵌入 4D Flamelet Generated Manifold (FGM) 表以及人工增厚的火焰 (ATF) 模型。生成的歧管的四个维度代表了有限速率化学、挥发物的混合以及气相中的焦炭产物和热损失。在模型应用于燃烧室之前，通过验证案例证明了其有效性。随后，借助可用的测量数据，对燃烧室的模拟结果进行了验证和讨论。研究了越来越复杂的操作点，从一个单相案例开始，该案例分析基于表格化学和 ATF 的辅助甲烷火焰的再现。在验证过程中，使用粒子图像测速 (PIV) 的速度场以及平面激光诱导的 OH 自由基荧光 (OH-PLIF) 的火焰位置。随后，研究了使用不同煤质量流量的操作条件。为了验证火焰稳定机制，可以使用靠近燃烧器区域的速度数据。对气体辅助煤火焰进行了进一步的检查，