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通过渐近理论分析研究了燃料与自由基的Lewis数对预混气体点火的影响。采用包含自由基的两步化学反应,基于火焰球模型,推导出了描述火焰球半径随点火能以及燃料与自由基的Lewis数而变化的关系式。并在此基础上发现不同参数条件下成功点火的三种情况,研究了燃料与自由基的Lewis数对最小点火能的影响。研究结果表明:随着燃料Lewis数的增大,最小点火能增大;随着自由基Lewis数的增大,最小点火能减小。
The asymptotic theory was used to analyze the influence of Lewis number of fuel and radical on ignition of premixed gas. Based on the flame sphere model, a two-step chemical reaction involving free radicals was used to deduce the relationship between the flame radius and the Lewis number of fuel and free radical. Based on this, three cases of successful ignition under different parameters were found, and the influence of Lewis number of fuel and free radical on the minimum ignition energy was studied. The results show that the minimum ignition energy increases with the increase of the Lewis number of the fuel, and the minimum ignition energy decreases as the Lewis number of free radicals increases.