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首页> 外文会议>Spring 2000 meeting of the Western States Section of the Combustion Institute (WSS/CI spring 2000) >The Asymptotic Structure of Weakly Strained Moderately Rich Methane-Air Flames
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The Asymptotic Structure of Weakly Strained Moderately Rich Methane-Air Flames

机译：弱应变中浓甲烷-空气火焰的渐近结构

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The asymptotic structure of weakly strained moderately rich premixed methane-airrnrames stabilised in stagnation-point rows between two streams is analysed. In the asymp-rntotic analysis the inruence of strain on the mass rux, on the temperature and on thernconcentration of chemical species in the rame is treated as a perturbation from their val-rnues in the corresponding unstrained rame. Perturbation analysis is carried out to thernfrst order. The deviation of the mass burning rate in the strained rame from the massrnburning rate in the corresponding unstrained rame is obtained in terms of the Marksteinrnnumber. The rame is presumed to comprise the preheat zone, the reaction zone, and thernpost-rame zone. The preheat zone is presumed to be inert. Chemical reactions takingrnplace in the rame are described by a reduced chemical-kinetic mechanism made up of fourrnglobal steps. The reaction zone is presumed to be made up of the inner layer and thernoxidation layer. Analysis of the preheat zone and the reaction zone gives su?cient numberrnof equations from which the Markstein numbers can be calculated. Numerical calcula-rntions are performed using a chemical-kinetic mechanism made up of elementary reactions.rnMarkstein numbers are obtained and they are found to agree reasonably well with thoserncalculated using the results of asymptotic analysis. At fxed values of pressure and initialrntemperature of the reactants, the Markstein numbers obtained from asymptotic analysisrnand numerical calculations are found to increase with the equivalence ratio,()u001e. Marksteinrnnumbers are also found to agree reasonably well with those deduced from experiments.rnAn interesting fnding of the present study is that the Markstein number for moderatelyrnrich rames depends on the Lewis number of both fuel and oxygen.
机译：分析了在两个流之间的停滞点排中稳定的弱应变的中等富集的预混合甲烷气瓶的渐近结构。在渐近分析中，将拉力对质量rux，对温度和对拉美中化学物质的浓度的影响视为对来自相应拉非拉美中它们的值的扰动。扰动分析以最先执行。根据Marksteinrn数获得应变拉美中的质量燃烧速率与对应的非应变拉美中的质量燃烧速率的偏差。推测该拉姆包括预热区，反应区和后post麻区。假定预热区是惰性的。通过由四个整体步骤组成的简化的化学动力学机制描述了在拉美中发生的化学反应。假定反应区由内层和氧化层组成。对预热区和反应区的分析给出了足够的numberrnof方程，从中可以计算出Markstein数。数值计算是使用由基本反应组成的化学动力学机理进行的。获得了马克斯坦数，并发现它们与使用渐近分析结果计算出的数值相当吻合。在反应物的压力和初始温度固定的值下，从渐近分析和数值计算获得的马克斯坦数被发现随着当量比（）u001e的增加而增加。还发现马克斯坦数与实验推论的数值相当吻合。本研究的一个有趣发现是，中等含量公羊的马克斯坦数取决于燃料和氧气的路易斯数。

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