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Automatic reduction and optimisation of chemistry for turbulent combustion modelling: Impact of the canonical problem

机译：湍流燃烧建模的化学自动还原和优化：规范问题的影响

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摘要

In a preliminary part, reduced chemical schemes from the literature on methane/air turbulent combustion are tested in one-dimensional premixed flames at various equivalence ratios. As discussed by Peters (1985), for the very same number of chemical species transported with the flow, a scheme introducing essential intermediate species through analytical relations derived from quasi-steady state and equilibrium assumptions, provides much better predictions than the global schemes limited to the transported species. Along these lines, a fully automated reduction procedure is discussed. The calibration of reduced chemistry usually relies on canonical problems, also computed with reference detailed chemical schemes. To cover at once a given range of chemical compositions, equivalence ratios and temperatures, the chemical properties of stochastic particles, submitted to micro-mixing and chemical reactions, are combined with the computation of deterministic one-dimensional composition-space trajectories, issued from an arbitrary number of inlet conditions. Along these trajectories, well-established methods to reduce the numbers of species and reactions are applied, cast in a fully automated manner. The rates of the resulting reduced scheme are then optimised, following a genetic algorithm, to match the detailed chemistry response. The discussed strategy is applied to methane/vitiated-air combustion. The accuracy of the resulting reduced scheme is evaluated in the simulation of freely propagating one-dimensional premixed flames, at various equivalence ratios, and also in strained diffusion flames in a one-dimensional counter flowing jet configuration, up to the quenching point The accurate reproduction of the flame speed response versus equivalence ratio requires adding premixed flames as target in the optimisation loop. Once the flame speed is captured, the quenching scalar dissipation rate of the diffusion flames is also well reproduced, as anticipated by Peters in a relation between the flame speed and the quenching scalar dissipation rate (Peters, 1991, 2000). Finally, the optimisation of the chemical rates is demonstrated under specific operating conditionS, featuring four inlets with a large variety of flow compositions. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在一开始，以各种当量比在一维预混火焰中测试了文献中有关甲烷/空气湍流燃烧的还原化学方案。正如Peters（1985）所讨论的，对于与流一起运输的化学物种数量相同，通过拟稳态和平衡假设得出的解析关系引入基本中间物种的方案提供的预测比全局方案限于以下情况更好。被运输的物种。沿着这些思路，讨论了全自动还原程序。还原化学的校准通常依赖于规范性问题，也可参考详细的化学方案进行计算。为了立即涵盖给定范围的化学成分，当量比和温度，将随机微粒的化学性质（经过微混合和化学反应）与确定性一维成分-空间轨迹的计算相结合，该确定性一维成分-空间轨迹由任意数量的入口条件。沿着这些轨迹，采用了成熟的减少种类和反应数量的方法，并以完全自动化的方式进行了铸造。然后，按照遗传算法，对所得简化方案的速率进行优化，以匹配详细的化学反应。所讨论的策略适用于甲烷/通风燃烧。通过模拟自由传播的一维预混火焰（在各种当量比下）以及在一维逆流射流结构中直至高达淬火点的应变扩散火焰中，可以评估所得简化方案的准确性。火焰速度响应与当量比的关系需要在优化循环中添加预混火焰作为目标。一旦捕获了火焰速度，扩散火焰的淬火标量耗散率也得到了很好的再现，正如彼得斯所预期的那样，火焰速度与淬火标量耗散率之间存在关系（Peters，1991，2000）。最后，在特定操作条件下证明了化学速率的最优化，其特点是四个入口具有多种流量组成。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2017年第1期|60-79|共20页
  • 作者

    Jaouen Nicolas; Vervisch Luc; Domingo Pascale; Ribert Guillaume;

  • 作者单位

    Normandie Univ, INSA Rouen, Technopole Madrillet, CORIA CNRS, BP 8, F-76801 St Etienne, France|Safran, Snecma Site Villaroche, F-77550 Moissy Cramayel, France;

    Normandie Univ, INSA Rouen, Technopole Madrillet, CORIA CNRS, BP 8, F-76801 St Etienne, France;

    Normandie Univ, INSA Rouen, Technopole Madrillet, CORIA CNRS, BP 8, F-76801 St Etienne, France;

    Normandie Univ, INSA Rouen, Technopole Madrillet, CORIA CNRS, BP 8, F-76801 St Etienne, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reduced chemistry; Genetic algorithm; Numerical simulation; Turbulent combustion;

    机译：化学还原;遗传算法;数值模拟;湍流燃烧;

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