Abstract To study the effect of plasma O3 on the combustion-supporting process for a coaxial jet combustor, large eddy simulation (LES)-partially stirred reactor (PaSR) simulation of a methane/air turbulent diffusion combustion was carried out based on OpenFOAM open-source software platform. The prediction of the turbulent diffusion flame was verified, and the results are in good agreement with the experiment data. Then the effect of air discharge product (i.e., O3) on the methane ignition and combustion process was investigated using plasma-assisted combustion model by 341 steps detailed reaction mechanism. The results show that the addition of O3 can increase the speed of flame propagation and accelerate the ignition process of methane combustion. It is also found that the vortex structure with O3 is more continuous in the recirculation zone, and the flame recirculation zone with O3 is closer to the inlet. The effect of O3 on enhanced combustion is more obvious in the low-temperature region, while the axial-velocity ratio with O3 is considerably improved in the high-temperature region. Besides, the plasma O3 will reduce the fluctuation of vx′vx’, especially at the peak point, which will tend to stabilize the recirculation zone.

中文翻译：

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同轴喷射燃烧器中等离子体辅助点火和燃烧的大涡模拟

摘要 为研究等离子体 O3 对同轴喷射燃烧器助燃过程的影响，基于 OpenFOAM 开放式对甲烷/空气湍流扩散燃烧的大涡模拟 (LES)-部分搅拌反应器 (PaSR) 模拟。源软件平台。对湍流扩散火焰的预测进行了验证，结果与实验数据吻合较好。然后采用等离子体辅助燃烧模型，通过341步详细反应机理研究了空气放电产物（即O3）对甲烷点火和燃烧过程的影响。结果表明，O3的加入可以提高火焰传播速度，加速甲烷燃烧的点火过程。还发现在再循环区与 O3 的涡旋结构更加连续，带O3的火焰再循环区更靠近入口。低温区O3对增强燃烧的影响更为明显，而高温区O3与O3的轴速比明显提高。此外，等离子体O3会降低vx'vx'的波动，特别是在峰值点，这将趋于稳定回流区。