The temperature dependence of the laminar burning velocity of ethanol flames
The temperature dependence of the laminar burning velocity of ethanol flames
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DOI：
10.1016/j.proci.2010.06.143
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Konnov;RJ Meuwissen;D. Goey
中科院分区：
文献类型：
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作者：
A. Konnov;RJ Meuwissen;D. Goey
热通量法首次扩展到液体燃料，并用于确定从火焰到燃烧器的净热损失为零的条件下的燃烧速度。非拉伸火焰在1atm下稳定在多孔板燃烧器上。对测量结果的一致性进行了分析和实验评估。燃烧速度的总体精度估计优于±1cm/s。实验在较长时间内具有良好的重现性。本文测量了初始混合温度为298 ~ 358 K的乙醇+空气火焰的绝热燃烧速度。实验结果与最近的文献数据在定容弹中得到的结果吻合得很好。Saxena和威廉姆斯的乙醇燃烧机制和Konnov机制显着过度预测乙醇层流燃烧速度在贫和近化学计量混合物。用SL= SL 0（T/T0）α关系式解释了初始温度对乙醇绝热层流燃烧速度的影响。特别注意到在大气压下幂指数α随当量比的变化。总结了实验数据和建议的经验表达式α作为当量比的函数。他们进行了比较详细的动力学模型的预测。实验证明和计算证实了在稍富的混合物中存在α极小值。
The Heat Flux method was extended for the first time towards liquid fuels and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1atm. Uncertainties of the measurements were analyzed and assessed experimentally. The overall accuracy of the burning velocities was estimated to be better than ±1cm/s. Excellent reproducibility of the experiments over an extended period of time was demonstrated. Measurements of the adiabatic burning velocity of ethanol+air flames in the range of initial mixture temperatures from 298 to 358K are presented. Experimental results are in a good agreement with the recent literature data obtained in constant volume bombs. Both the ethanol combustion mechanism of Saxena and Williams and the Konnov mechanism significantly over-predict ethanol laminar burning velocities in lean and near-stoichiometric mixtures. The effects of initial temperature on the adiabatic laminar burning velocities of ethanol were interpreted using the correlation SL=SL0(T/T0)α. Particular attention was paid to the variation of the power exponent α with equivalence ratio at atmospheric pressure. Experimental data and proposed empirical expressions for α as a function of equivalence ratio were summarized. They were compared with the predictions of detailed kinetic models. The existence of a minimum in α in the slightly rich mixtures is demonstrated experimentally and confirmed computationally.