P-DRGEP: a novel methodology for the reduction of kinetics mechanisms for plasma-assisted combustion applications
P-DRGEP: a novel methodology for the reduction of kinetics mechanisms for plasma-assisted combustion applications
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P-DRGEP：一种减少等离子体辅助燃烧应用动力学机制的新方法
DOI：
10.1016/j.proci.2020.06.363
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发表时间：
2021
影响因子：
3.4
通讯作者：
Bisetti, Fabrizio
中科院分区：
文献类型：
--
作者：
Bellemans, Aurélie;Kincaid, Nicholas;Deak, Nicholas;Pepiot, Perrine;Bisetti, Fabrizio
等离子体辅助燃烧的详细动力学机制包含许多物种和反应，这些物种和反应模拟了非平衡等离子体过程和烃氧化之间的相互作用。虽然物理上准确和全面，这种详细的机制是不切实际的模拟不稳定的多维等离子体放电及其对反应混合物在实际设备中的影响。在这项工作中，我们开发和应用一种新的方法，减少大的详细等离子体辅助燃烧机制，以较小的骨架。该方法扩展了有向关系图与误差传播（DRGEP）的方法，以考虑在还原过程中的等离子体放电的能量分支特性。确保严格的误差容限的相对比例的能量损失的电子的各种类别的影响过程（即振动和电子激发，电离和碰撞解离）是关键，以保持正确的放电物理的骨架机制。为此，定义了包括能量转移在内的新目标，并将其纳入DRGEP。的新框架，称为P-DRGEP的性能进行了评估的模拟乙烯-空气点火纳秒重复脉冲放电在相关条件下的超音速燃烧和火焰保持在超燃冲压发动机腔，即从600 K到1000 K，0.5大气压，和当量比在0.75和1.5之间。P-DRGEP被认为是大大上级传统的减少等离子体辅助点火的方法，因为它产生了一个更小的骨架机制，具有显着较低的错误。对于在目标条件下的乙烯-空气点火，P-DRGEP生成具有54个物种和236个反应的骨架机制，导致点火模拟的84%的计算速度提高，同时保证第一个脉冲后点火所需时间的误差低于10%，平均电子能量的误差低于1%，取决于过程的电子能量损失在4%和35%之间，对层流火焰速度的影响为5%。
Detailed kinetics mechanisms for plasma-assisted combustion contain numerous species and reactions that model the interplay between non-equilibrium plasma processes and hydrocarbon oxidation. While physically accurate and comprehensive, such detailed mechanisms are impractical for simulations of unsteady multi-dimensional plasma discharges and their effect on reactive mixtures in practical devices. In this work, we develop and apply a novel methodology for the reduction of large detailed plasma-assisted combustion mechanisms to smaller skeletal ones. The methodology extends the Directed Relation Graph with Error Propagation (DRGEP) approach in order to consider the energy branching characteristics of plasma discharges during the reduction. Ensuring tight error tolerances on the relative proportions of energy lost by the electrons to the various classes of impact processes (i.e. vibrational and electronic excitation, ionization, and impact dissociation) is key to preserving the correct discharge physics in the skeletal mechanism. To this end, new targets that include energy transfers are defined and incorporated in DRGEP. The performance of the novel framework, called P-DRGEP, is assessed for the simulation of ethylene-air ignition by nanosecond repetitive pulsed discharges at conditions relevant to supersonic combustion and flame holding in scramjet cavities, i.e. from 600 K to 1000 K, 0.5 atm, and equivalence ratios between 0.75 and 1.5. P-DRGEP is found to be greatly superior to the traditional reduction approach applied to plasma-assisted ignition in that it generates a smaller skeletal mechanism with significantly lower errors. For ethylene-air ignition at the target conditions, P-DRGEP generates a skeletal mechanism with 54 species and 236 reactions, resulting in a 84% computational speed-up for ignition simulations, while guaranteeing errors below 10% on the time required for ignition following the first pulse, 1% on the mean electron energy, between 4 and 35% on electron energy losses depending on the process, and 5% on the laminar flame speed.
等离子体辅助点燃甲烷/空气和乙烯/空气混合物： 低压和高压下的效率
影响因子：
3.4
作者：
Deak, Nicholas;Bellemans, Aurelie;Bisetti, Fabrizio
通讯作者：
Bisetti, Fabrizio
在 CFD 应用中包括分析还原化学 (ARC)
影响因子：
3.5
作者：
Felden, Anne;Pepiot, Perrine;Esclapez, Lucas;Riber, Eleonore;Cuenot, Bénédicte
通讯作者：
Cuenot, Bénédicte
DOI：
10.1021/acs.energyfuels.8b01001
发表时间：
2018-10-18
期刊：
Energy & fuels : an American Chemical Society journal
影响因子：
--
作者：
Li Z;Lewandowski MT;Contino F;Parente A
通讯作者：
Parente A