A Posteriori Assessment of Algebraic Scalar Dissipation Models for RANS Simulation of Premixed Turbulent Combustion

A Posteriori Assessment of Algebraic Scalar Dissipation Models for RANS Simulation of Premixed Turbulent Combustion
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预混湍流燃烧 RANS 模拟的代数标量耗散模型的事后评估

DOI:
10.1007/s10494-017-9824-z
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发表时间:
2017
期刊:
Flow, Turbulence and Combustion
影响因子:
--
通讯作者:
Ahmed U
Ahmed U
中科院分区:
--
文献类型:
--
作者:
Ahmed U

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本文研究了标量耗散率模型对湍流预混火焰中平均反应速率预测的影响。平均反应速率的敏感性,探索通过使用不同的封闭标量耗散和标量耗散模型本身的敏感性也检查相对于其定义常数。不同的标量耗散模型的火焰位置和平均速度的影响,并与实验结果进行了比较。预测的反应速率被发现是敏感的标量耗散所使用的封闭的选择,也在标量耗散模型中使用的相应常数。还发现,标量耗散模型涉及化学和湍流时间尺度产生一个物理上更合理的反应速率相比,标量耗散模型只依赖于湍流时间尺度。
This paper examines the effects of scalar dissipation rate modelling on mean reaction rate predictions in turbulent premixed flames. The sensitivity of the mean reaction rate is explored by using different closures for scalar dissipation and the sensitivity of the scalar dissipation models themselves is also examined with respect to their defining constants. The influence of different scalar dissipation models on the flame location and mean velocities is reported and compared with experimental results. The predicted reaction rate is found to be sensitive to the choice of closure used for scalar dissipation and also to the respective constants used in the scalar dissipation models. It is also found that the scalar dissipation models involving chemical and turbulent time scales yield a more physically plausible reaction rate when compared with the scalar dissipation models relying only on the turbulent time scale.
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