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A versatile coupled progress variable/REDIM model for auto-ignition and combustion
Proceedings of the Combustion Institute ( IF 3.4 ) Pub Date : 2016-10-06 , DOI: 10.1016/j.proci.2016.07.073
Marc-Sebastian Benzinger , Robert Schießl , Ulrich Maas

In this work, we present a reduced model for treating chemical reactions in combustion simulations, with special attention on combustion in IC engines. The model which is based on low-dimensional manifolds in state space, is able to describe auto-ignition, burning in quasi homogeneous media as well as chemical reactions which are strongly coupled with molecular transport, like, e.g., in flame propagation. A coupling scheme is developed for existing concepts for reduced treatment of combustion, namely a progress variable model (PVM) and the reaction-diffusion manifold approach (REDIM). We discuss a simple, robust method for this coupling, based on an additional variable, namely the normalized strength of molecular transport. The implementation and behavior of the resulting coupled model are shown. To demonstrate the performance of the model, numerical simulations of representative combustion scenarios are performed, both with fully detailed calculations and with the reduced model. The comparison of results obtained with detailed and reduced computation shows that the strongly reduced model, which requires only five independent variables in total, still can accurately predict a wide range of combustion-relevant scenarios.



中文翻译:

用于自动点火和燃烧的通用耦合进度变量/ REDIM模型

在这项工作中,我们提出了一种简化模型,用于处理燃烧模拟中的化学反应,并特别关注IC发动机的燃烧。该模型基于状态空间中的低维流形,能够描述自燃,在准均质介质中燃烧以及化学反应,这些化学反应与分子传输密切相关,例如在火焰传播中。针对现有的减少燃烧处理的概念开发了一种耦合方案,即进度变量模型(PVM)和反应扩散歧管方法(REDIM)。我们基于一个附加变量,即分子运输的归一化强度,讨论了一种简单,鲁棒的耦合方法。显示了所得耦合模型的实现和行为。为了演示模型的性能,用完全详细的计算和简化的模型对代表性燃烧情景进行了数值模拟。通过详细计算和精简计算获得的结果的比较表明,只需要总共五个独立变量的强精简模型仍然可以准确地预测与燃烧相关的各种情景。

更新日期:2016-10-06
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