THE INFLUENCE OF REAL-GAS THERMODYNAMICS ON SIMULATIONS OF FREELY PROPAGATING FLAMES IN METHANE/OXYGEN/INERT MIXTURES
THE INFLUENCE OF REAL-GAS THERMODYNAMICS ON SIMULATIONS OF FREELY PROPAGATING FLAMES IN METHANE/OXYGEN/INERT MIXTURES
复制标题
真实气体热力学对甲烷/氧气/惰性混合物中自由传播火焰模拟的影响
DOI：
10.1080/00102200701259999
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. Lentini
中科院分区：
文献类型：
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作者：
M. Marchionni;S. Aggarwal;I. Puri;D. Lentini
摘要高压燃烧的建模在化学动力学和混合物输运性质方面提出了一个持续的挑战。这主要是由于缺乏高压下的实验数据。因此，在中等压力以上的模拟准确性方面的置信度有限。在本文中，真实的气体热力学包括在反应流模拟中，例如，采用Redlich-Kwong状态方程，修正了确定详细反应机理中逆反应速率的平衡反应速率常数表达式，并考虑了高压对焓和比热的影响。这些真实的气体效应的特点是通过模拟自由传播的火焰在甲烷/氧气/惰性气体混合物在压力高达150大气压。我们的研究结果表明，层流火焰速度随压力的增加更迅速地下降时，真实的气体配方比理想气体，特别是压力大于40大气压。这种差异可以归因于高压对混合物比热的影响。结合真实的气体热力学改进了预测与测量的一致性。
Abstract The modeling of high-pressure combustion presents a continuing challenge in the context of chemical kinetics and mixture transport properties. This is mainly due to a lack of experimental data at high pressures. Consequently, there is limited confidence in the accuracy of simulations above moderate pressures. In this paper real gas thermodynamics is included in reacting flow simulations, e.g., by adopting the Redlich–Kwong equation of state, modifying the expression of the equilibrium reaction rate constants that are used to determine reverse reaction rates in a detailed reaction mechanism, and considering high-pressure effects on the enthalpy and specific heat. These real gas effects are characterized through simulations of freely propagating flames in methane/oxygen/inert mixtures at pressures up to 150 atm. Our results indicate that the laminar flame speed decreases more rapidly with increasing pressure when the real gas formulation is employed than for an ideal gas, particularly for pressures greater than 40 atm. The differences can be ascribed to high-pressure effects on the mixture specific heat. The incorporation of real gas thermodynamics improves the agreement of predictions with measurements.