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首页> 外文期刊>Combustion Science and Technology >Numerical Study on the Combustion Process of n-heptane Spray Flame in Methane Environment Using Large Eddy Simulation
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Numerical Study on the Combustion Process of n-heptane Spray Flame in Methane Environment Using Large Eddy Simulation

机译：使用大涡模拟甲烷环境中正庚烷喷雾火焰燃烧过程的数值研究

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Large eddy simulation is applied for the combustion process of n-heptane spray flame in methane environment. The influence of methane (CH4) concentration on the auto-ignition process and flame structures are discussed in detail. By increasing the CH4 concentration in the ambient gas, auto-ignition is delayed obviously at a low initial temperature because of the delayed first-stage ignition. While at a high temperature, the auto-ignition time is less influenced by the addition of CH4. However, after the addition of CH4, the concentration of the mixture where the high-temperature ignition is initialed becomes much richer and it is independent of the initial temperatures. In addition, the chemical explosive mode analysis (CEMA) method shows that the mixture in high-temperature regions is non-explosive without CH4 addition, and the abrupt transition between the explosive and non-explosive mixture at the tip of the reacting spray is observed by adding CH4 in the ambient gas, indicating that a flame front is developing downstream. This flame front exists for a long time at low CH4 concentration. The eigenvalue of the Jacobian matrix for the CH4/air mixture in the ambient gas is increased significantly with the addition of CH4, indicating that the combustion process is dominated by auto-ignition. Finally, results show that the development of the flame is accelerated by the addition of CH4 in the ambient gas.
机译：甲烷环境中正庚烷喷雾火焰的燃烧过程应用了大型涡流模拟。详细讨论了甲烷（CH4）浓度对自动点火过程和火焰结构的影响。通过增加环境气体中的CH4浓度，由于延迟的第一阶段点火，自动点火明显延迟了较低的初始温度。虽然在高温下，通过添加CH4的自动点火时间较小。然而，在加入CH 4之后，初始化高温点火的混合物的浓度变得更加丰富，并且与初始温度无关。此外，化学爆炸模式分析（CEMA）方法表明，高温区域中的混合物在没有CH 4的添加的情况下是非爆炸性的，并且观察到反应喷雾尖端的爆炸性和非爆炸混合物之间的突然转变通过在环境气体中添加CH 4，表明火焰前沿正在下游发展。该火焰前部在低CH 4浓度下存在很长时间。对于CH4的加入，环境气体中CH4 /空气混合物的雅加伯基质的特征值显着增加，表明燃烧过程通过自动点火支配。最后，结果表明，通过在环境气体中加入CH 4加速了火焰的发展。

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