Scalar dissipation rate transport conditional on flow topologies in different regimes of premixed turbulent combustion
Scalar dissipation rate transport conditional on flow topologies in different regimes of premixed turbulent combustion
复制标题
预混湍流燃烧不同状态下流动拓扑条件下的标量耗散率传输
DOI：
10.1016/j.proci.2018.06.092
复制
发表时间：
2019
影响因子：
3.4
通讯作者：
Chakraborty N
中科院分区：
文献类型：
--
作者：
Chakraborty N
基于一个详细的化学直接数值模拟数据库，对氢-空气湍流预混火焰中局部流动拓扑条件下的Favre平均标量耗散率输运进行了分析。该数据库描述了氢-空气湍流预混火焰的波纹状火焰区、薄反应区和破碎反应区燃烧区。局部流动拓扑结构已被归类的速度梯度张量的三个不变量的值和统计行为的Favre平均标量耗散率条件下，这些流动拓扑结构已被详细分析了不同的选择的反应进展变量。已被发现的定性行为的标量湍流相互作用项的Favre平均标量耗散率运输方程中的燃烧制度的影响，而化学反应速率梯度贡献的标量耗散率运输已被发现受影响的反应进展变量的选择。的拓扑结构，它存在的所有值的膨胀率，有助于显着的Favre平均标量耗散率运输预混湍流火焰的所有制度的燃烧。此外，流的拓扑结构，这是只为正值的膨胀率，有助于显着的Favre平均标量耗散率运输的情况下，代表波纹火焰制度燃烧。一个不稳定的节点流拓扑结构，这是一个逆流配置的代表，已被发现是一个占主导地位的贡献者Favre平均标量耗散率运输的所有制度的燃烧，无论选择的反应进展变量。
The Favre-averaged scalar dissipation rate transport conditional on local flow topologies in premixed turbulent flames has been analysed based on a detailed chemistry Direct Numerical Simulation database of statistically planar turbulent hydrogen-air premixed flames with an equivalence ratio of 0.7 representing the corrugated flamelets, thin reaction zones and broken reaction zones regimes of premixed turbulent combustion. The local flow topologies have been categorised by the values of the three invariants of the velocity gradient tensor and the statistical behaviour of the Favre-averaged scalar dissipation rate conditional on these flow topologies has been analysed in detail for different choices of reaction progress variable. The qualitative behaviour of the scalar-turbulence interaction term in the Favre-averaged scalar dissipation rate transport equation has been found to be affected by the regime of combustion, whereas the chemical reaction rate gradient contribution to the scalar dissipation rate transport has been found to be affected by the choice of the reaction progress variable. The topologies, which exist for all values of dilatation rate, contribute significantly to the Favre-averaged scalar dissipation rate transport in premixed turbulent flames for all regimes of combustion. In addition, the flow topologies, which are obtained only for positive values of dilatation rate, contribute significantly to the Favre-averaged scalar dissipation rate transport in the case representing the corrugated flamelets regime combustion. An unstable nodal flow topology, which is representative of a counter-flow configuration, has been found to be a dominant contributor to the Favre-averaged scalar dissipation rate transport for all regimes of combustion irrespective of the choice of reaction progress variable.
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影响因子：
4.4
作者：
Chakraborty, Nilanjan;Cant, R. S.
通讯作者：
Cant, R. S.
影响因子：
4.6
作者：
N. Chakraborty;N. Swaminathan
通讯作者：
N. Chakraborty;N. Swaminathan
湍流预混燃烧大涡模拟的标量耗散率代数收敛
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
Y. Gao;N. Chakraborty;N. Swaminathan
通讯作者：
N. Swaminathan
影响因子：
4.4
作者：
Dopazo, Cesar;Cifuentes, Luis;Jimenez, Carmen
通讯作者：
Jimenez, Carmen
影响因子：
4.6
作者：
Reddy, Harinath;Abraham, John
通讯作者：
Abraham, John