基于敏感性分析的反应动力学自适应建模方法

A reaction dynamic adaptive chemistry modeling methodbased on sensitivity analysis

关键词:  机理简化  敏感性分析  自适应  反应流

Key words:  Mechanism reduction  Sensitivity analysis  Adaptive  Reactive flow

摘要:

为了降低采用基元燃烧模型模拟反应流的计算时间,提出一种基于敏感性分析的自适应化学反应机理简化方法。该方法结合敏感性分析方法与自适应机理简化的思想对详细化学反应机理在不同工况点进行简化,并形成即时简化机理集。在燃烧模拟过程中,对于不同反应工况点使用不同的即时简化机理对反应流进行数值模拟,以替代传统的全局使用单一简化机理的反应流数值模拟方法。基于GRI-3.0机理,采用均相大空间甲烷自燃着火过程对该方法进行了测试；简化机理与详细机理计算结果的比较,证明了该方法的正确性与高效性。

Abstract:

In order to save CPU time for the calculation of dynamic process for reactive flow, a dynamic adaptive chemistry modeling method based on sensitivity analysis theory is presented. A detailed mechanism can be reduced to a lot of instantaneously locally accurate mechanisms with smaller number of species and reactions, and different instantaneously accurate sub-mechanisms are used in different working conditions to model the combustion process of the reactive flow. This method is implemented into the simulating of homogeneous bulk space methane auto-ignition process using GRI-3.0 mechanism as the detailed mechanism. Compared with the detailed mechanism, the process produces the temperature and species mole fraction curves with high accuracy. Since the smaller reaction numbers are used in the simulation process, this method makes the whole calculation much more efficient.