Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis
Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis
复制标题
湍流预混火焰中标量耗散率传输的局部应变率和曲率依赖性:直接数值模拟分析
DOI:
10.1155/2014/280671
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发表时间:
2014
影响因子:
0.7
通讯作者:
Gao Y
中科院分区:
文献类型:
--
作者:
Gao Y
The statistical behaviours of the instantaneous scalar dissipation rateNcof reaction progress variablecin turbulent premixed flames have been analysed based on three‐dimensional direct numerical simulation data of freely propagating statistically planar flame and V‐flame configurations with different turbulent Reynolds number Ret. The statistical behaviours ofNcand different terms of its transport equation for planar and V‐flames are found to be qualitatively similar. The mean contribution of the density‐variation termT1is positive, whereas the molecular dissipation term (−D2) acts as a leading order sink. The mean contribution of the strain rate termT2is predominantly negative for the cases considered here. The mean reaction rate contributionT3is positive (negative) towards the unburned (burned) gas side of the flame, whereas the mean contribution of the diffusivity gradient term (D) assumes negative (positive) values towards the unburned (burned) gas side. The local statistical behaviours ofNc,T1,T2,T3, (−D2), andf(D) have been analysed in terms of their marginal probability density functions (pdfs) and their joint pdfs with local tangential strain rateaTand curvaturekm. Detailed physical explanations have been provided for the observed behaviour.
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