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。
Asymptotic theoretical analysis is conducted to investigate the effects of Lewis numbers of fuel and radical on the ignition of premixed gases.Considering the two-step chemistry with radical kinetics,we derived the correlation depicting the change of flame ball radius with ignition power as well as the Lewis numbers of fuel and radical based on the model of stationary flame ball.With the help of this correlation,three different cases of successful ignition are found and the effects of fuel and radical Lewis numbers on the minimum ignition power are assessed.It is found that the minimum ignition power increases with the fuel Lewis number while it decreases with the radical Lewis number.
参考文献
| [1] | Longting He .Critical conditions for spherical flame initiation in mixtures with high Lewis numbers[J].Combustion theory and modelling,2000(2):159-172. |
| [2] | Chen Z;Ju Y .Theoretical analysis of the evolution from ignition kernel to flame ball and planar flame[J].Combustion theory and modelling,2007(3):427-453. |
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