Prediction of propagating flames under high-pressure conditions with real-fluid combustion modeling
Prediction of propagating flames under high-pressure conditions with real-fluid combustion modeling
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通过真实流体燃烧模型预测高压条件下的火焰传播
DOI：
10.1016/j.proci.2022.08.094
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发表时间：
2022
影响因子：
3.4
通讯作者：
Koshi Mitsuo
中科院分区：
文献类型：
--
作者：
Terashima Hiroshi;Koshi Mitsuo
本研究讨论了计算流体动力学（CFD）建模的高压条件下，包括超临界压力条件下的燃烧流。真实流体的影响被认为是在热力学性质，运输性质，和化学动力学。在本模型中，通过使用吉布斯自由能变化的化学反应和逸度的修改后的平衡常数引入化学动力学的实际流体的影响。用本模型得到的结果与可用的实验数据的高压预混H2/O2传播火焰稀释Ar或He。我们证明在H2/O2/Ar火焰的情况下，真实流体模型提供了一个更好的预测精度的负压依赖的质量燃烧速率相比，理想气体模型。预测精度的提高主要归功于通过合适的状态方程和偏离函数对未燃气焓等热力学性质的正确估计。H2/O2/Ar混合物的未燃气焓与真实流体模型的负压依赖性显着影响在高压条件下的火焰速度预测。另一方面，虽然H2/O2/He混合物显示出正压力的焓的依赖性，在真实流体和理想气体模型之间的质量燃烧速率的差异是不显着的H2/O2/He火焰的情况下。在He稀释的情况下，由于H2/O2/He混合物的低密度，真实流体效应被破坏。因此，真实流体效应出现不同的传播火焰的预测取决于物种组成和热力学条件。目前的研究表明，正或负的压力依赖的焓（即，等温焦耳-汤姆逊系数）是一个度量，以确定出现的真实流体的影响。
The present study discusses computational fluid dynamics (CFD) modeling for combustion flows under high-pressure conditions, including supercritical pressure conditions. The real-fluid effects are considered in terms of thermodynamic properties, transport properties, and chemical kinetics. In the present model, the real-fluid effect on chemical kinetics is introduced via a modified equilibrium constant derived using the Gibbs free energy variation of chemical reactions and the fugacity. The results obtained with the present model are compared with available experimental data of high-pressure premixed H 2/O 2 propagating flames diluted by Ar or He. We demonstrate in the H 2/O 2/Ar flame case that the real-fluid model provides a better prediction accuracy for the negative pressure dependence of the mass burning rate compared to the ideal-gas model. The improved prediction accuracy is primarily attributed to the proper estimation of thermodynamic properties such as unburnt-gas enthalpy via an appropriate equation of state and a departure function. The negative pressure dependence of unburnt-gas enthalpy of the H 2/O 2/Ar mixture with the real-fluid model significantly affects the flame speed prediction under high-pressure conditions. On the other hand, although the H 2/O 2/He mixture shows a positive pressure dependence of enthalpy, differences in the mass burning rate between the real-fluid and ideal-gas models are not significant for the H 2/O 2/He flame case. In the He-diluted case, the real-fluid effect is undermined owing to the low density of the H 2/O 2/He mixture. Thus, the real-fluid effect appears differently in the prediction of propagating flames depending on the species composition and thermodynamic conditions. The present study suggests that the positive or negative pressure dependence of enthalpy (ie, the isothermal Joule–Thomson coefficient) is a metric to identify the real-fluid effects that appear.
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