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Local and Global Uncertainty Analyses of a Methane Flame Model

机译:甲烷火焰模型的局部和全局不确定性分析

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摘要

Local and global uncertainty analyses of a flat,premixed,stationary,laminar methane flame model were carried out using the Leeds methane oxidation mechanism at lean(phi = 0.70),stoichiometric(phi = 1.00),and rich(phi = 1.20)equivalence ratios.Uncertainties of laminar flame velocity,maximal flame temperature,and maximal concentrations of radicals H,O,OH,CH,and CH2 were investigated.Global uncertainty analysis methods included the Morris method,the Monte Carlo analysis with Latin hypercube sampling,and an improved version of the Sobol' method.Assumed probability density functions(pdf's)were assigned to the rate coefficients of all the 175 reactions and to the enthalpies of formation of the 37 species.The analyses provided the following answers:approximate pdf's and standard deviations of the model results,minimum and maximum values of the results at any physically realistic parameter combination,and the contribution of the uncertainty of each parameter to the uncertainty of the model result.The uncertainty of a few rate parameters and a few enthalpies of formation causes most of the uncertainty of the model results.Most uncertainty comes from the inappropriate knowledge of kinetic data,but the uncertainty caused by thermodynamic data is also significant.
机译:使用利兹甲烷氧化机理,在稀薄(phi = 0.70),化学计量(phi = 1.00)和浓(phi = 1.20)的当量比下,对平面,预混合,固定的层状甲烷火焰模型进行局部和全局不确定性分析研究了层流火焰速度,最高火焰温度以及自由基H,O,OH,CH和CH2的最大浓度的不确定性。全局不确定性分析方法包括Morris方法,带拉丁超立方采样的Monte Carlo分析以及改进的方法假设概率密度函数(pdf)分配给所有175个反应的速率系数和37个物种的形成焓。分析提供以下答案:近似pdf和标准偏差模型结果,任何物理上现实的参数组合的结果的最小值和最大值,以及每个参数的不确定性对模型res的不确定性的贡献几个速率参数和几个生成焓的不确定性导致了模型结果的大部分不确定性。大多数不确定性来自对动力学数据的不适当了解,但是由热力学数据引起的不确定性也很重要。

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