H_2/Air/CO_2点火过程中的热辐射和化学反应效应

Radiation and Kinetic Effects on the Ignition of H_2/Air/CO_2 Mixtures

本文采用基于详细化学反应机理的化学反应流自适应数值模拟技术,研究了添加二氧化碳对氢气/空气预混气体点火的影响,获得了不同当量比下最小点火能随稀释率的变化情况。本文引入最小点火能的热辐射敏感度与化学反应敏感度,重点分析了CO_2的热辐射效应和化学反应效应对最小点火能的影响。研究结果表明二氧化碳的热辐射效应和化学反应效应只有在接近极限稀释率时才会导致最小点火能有显著升高。

A computational study is performed to investigate the effects of C02 addition on the ignition of premixed H2/air mixtures with detailed chemistry for adaptive simulation of unsteady reactive flow. The changes of the minimum ignition energies （MIE） with the dilution ratio for different stoichiometric H2/air/CO2 mixtures are obtained. Radiation sensitivity and reaction sensitivity are introduced to examine the radiation and kinetic effects on the MIE. It is found that the radiation and kinetic effects of CO2 lead to remarkable increase in the MIE only when the dilution ratio is close to the dilution limit.