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本文通过渐近理论分析研究了预混气体的自由基点火。采用包含自由基动力学的两步化学反应,基于火焰球模型,推导出了描述火焰球半径随热点火能和自由基点火能以及燃料与自由基的Lewis数的关系式。并在此基础上分别分析了不存在热点火和存在热点火时自由基点火的临界条件,研究了燃料与自由基的Lewis数对最小自由基点火能的影响。研究结果表明:仅存在自由基点火时,最小自由基点火能随着自由基Lewis数的增加而减小,但燃料Lewis数对最小自由基点火能无影响。
In this paper, asymptotic theory analysis of premixed gas ignition of free radicals. Based on the flame-sphere model, a two-step chemical reaction involving radical dynamics was used to derive the relationship between the flame radius and the ignition energy of free radicals and the Lewis number of fuel and free radicals. On the basis of this, the critical conditions for the ignition of free radicals in the absence of hot ignition and in the presence of hot ignition were analyzed respectively. The influence of Lewis number of fuel and free radical on the ignition energy of the minimum free radical was studied. The results show that when only free radicals are ignited, the minimum free radical ignition energy decreases with the increase of the Lewis number of free radicals, but the Lewis number of the fuel has no influence on the minimum free radical ignition.