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首页> 外文期刊>Combustion and Flame >Large Eddy Simulation of lifted turbulent flame in cold air using Doubly Conditional Source-term Estimation
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Large Eddy Simulation of lifted turbulent flame in cold air using Doubly Conditional Source-term Estimation

机译：基于双重条件源项估计的冷空气中湍流火焰升起的大涡模拟

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摘要

The present study is focused on Large Eddy Simulation with Doubly Conditional Source-term Estimation (DCSE) applied to a series of lifted turbulent flames in cold air without autoignition. DCSE is formulated for partially-premixed turbulent combustion. Predictions for time-averaged methane concentration and its root mean square (rms), Probability Density Function (PDF), flame width, lift-off height and some qualitative observations are presented and compared with experimental data. The predicted methane concentrations are in good agreement with the experiments. Discrepancies for the rms are observed and several sources of discrepancies are identified. PDF of methane concentration and flammability region are also in good agreement. The lift-off heights are predicted very well. Some edge flame characteristics are visible in the simulated flames. The progress variable scalar dissipation rate model does not have a significant impact on methane concentration predictions, while it has a larger effect on predicted liftoff height and temperature. Inclusion of the non-premixed mode in the closure of the progress variable transport equation has a small effect on the current lift-off height predictions, but has a larger impact on the temperature profiles. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：本研究的重点是采用双重条件源项估计（DCSE）的大涡模拟，该模拟应用于一系列在没有自燃的冷空气中升起的湍流火焰。 DCSE用于部分预混湍流燃烧。提出了时间平均甲烷浓度及其均方根（rms），概率密度函数（PDF），火焰宽度，提离高度和一些定性观察结果的预测，并与实验数据进行了比较。预测的甲烷浓度与实验吻合良好。观察到rms的差异，并确定了几种差异来源。甲烷浓度和可燃性区域的PDF也非常吻合。预计起飞高度。在模拟火焰中可以看到一些边缘火焰特征。进度可变标量耗散率模型对甲烷浓度的预测没有显着影响，而对预测的升空高度和温度影响较大。在进度变量输运方程式的闭合中包含非预混模式对当前提离高度的预测影响很小，但对温度曲线的影响更大。 （C）2019燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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