Towards a high-accuracy kinetic database informed by theoretical and experimental data: CH3 + HO2 as a case study

Towards a high-accuracy kinetic database informed by theoretical and experimental data: CH3 + HO2 as a case study
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建立基于理论和实验数据的高精度动力学数据库:以 CH3 HO2 为例

DOI:
10.1016/j.proci.2020.06.324
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发表时间:
2021
影响因子:
3.4
通讯作者:
Burke, Michael P.
Burke, Michael P.
中科院分区:
工程技术1区
文献类型:
--
作者:
LaGrotta, Carly E.;Barbet, Mark C.;Lei, Lei;Burke, Michael P.

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The reliability of predictive simulations for advanced combustion engines depends on the availability of accurate data and models for thermochemistry, chemical kinetics, and transport. In that regard, accurate data are critically important for both their direct use in predictive simulations and for benchmarking improved theoretical methodologies that can similarly produce accurate data for predictive simulations. The use of informatics-based strategies for the determination of accurate thermochemical data with well-defined uncertainties, e.g. the Active Thermochemical Tables (ATcT), has revolutionized the field of thermochemistry–providing thermochemical data of unprecedented accuracy for predictive combustion simulations and has served as a key enabler ofab initioelectronic structure methodologies of equally impressive accuracy. Clearly, pursuit of informatics-based analogs in chemical kinetics would be similarly worthwhile. Here, we present results and analyses for the kinetics of CH3+ HO2reactions that demonstrate some key elements of any approach to developing analogs for kinetics, including: the importance of raw data for quantifying the information content of experimental data, the utility of theoretical kinetics calculations for constraining experimental interpretations and providing an independent data source, and the subtleties of target data selection for avoiding unphysical parameter adjustments to match data affected by structural uncertainties. Notably, we find the optimization performed here using the MultiScale Informatics (MSI) approach applied to carefully selected (mostly raw) experimental data yields an opposite temperature dependence for the channel-specific CH3+ HO2rate constants as compared to a previous rate-parameter optimization. While both optimization studies use the same theoretical calculations to constrain model parameters, only the present optimization, which incorporates theory directly into the model structure, yields results that are consistent with theoretical calculations.
混合规则和衰减现在是实验得出的 H O2 (M) – HO2 (M) 速率参数中的主要不确定性
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