LES and RANS of air and oxy-coal combustion in a pilot-scale facility: Predictions of radiative heat transfer
LES and RANS of air and oxy-coal combustion in a pilot-scale facility: Predictions of radiative heat transfer
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DOI：
10.1016/j.fuel.2015.01.089
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发表时间：
2015-07-01
期刊：
影响因子：
7.4
通讯作者：
Pourkashanian, Mohamed
中科院分区：
文献类型：
--
作者：
Clements, Alastair G.;Black, Sandy;Pourkashanian, Mohamed
本研究评估了使用大涡模拟 (LES) 和雷诺平均纳维斯托克斯 (RANS) 模型来预测中试规模 250 kW(th) 熔炉中空气和富氧环境下煤的湍流燃烧。该炉是 UKCCSRC 中试规模先进捕集技术 (PACT) 设施的一部分，专为燃烧过程的详细分析而设计。热辐射的预测通过空气和氧气燃烧状态下的实验测量进行了验证。在 RANS 计算过程中评估了两种辐射模型，即广泛使用的灰色气体加权和 (WSGG) 和全谱相关 k (FSCK) 模型，而 LES 情况则使用 FSCK 辐射模型进行计算。结果表明，气体辐射模型的选择表明 RANS 计算中的温度和热通量预测只有很小的变化，而对于空气燃烧和富氧燃煤燃烧，LES 解决方案能够比 RANS 预测与测量值取得更好的一致性。 (C) 2015 Elsevier Ltd. 保留所有权利。
This study evaluates the use of large eddy simulation (LES) and Reynolds-averaged Navier Stokes (RANS) models for the prediction of turbulent coal combustion under air and oxyfuel environments in a pilotscale 250 kW(th) furnace. The furnace is part of the UKCCSRC Pilot-scale Advanced Capture Technology (PACT) facilities and was designed for detailed analysis of the combustion process. The prediction of thermal radiation is validated against experimental measurements under both air- and oxy-firing regimes. Two radiation models were evaluated during the RANS calculations, the widely used weighted sum of grey gases (WSGG) and the full-spectrum correlated k (FSCK) model, while the LES case was calculated using the FSCK radiation model. The results show that the choice in gas radiation model demonstrates only a small change in the temperature and heat flux predictions in the RANS calculations, while the LES solutions are able to achieve better agreement with measured values than the RANS predictions for both air-fired and oxyfuel coal combustion. (C) 2015 Elsevier Ltd. All rights reserved.