论文部分内容阅读
利用气体电离理论推导出氢气-空气混合气体电离后组成成分,理论分析活性基团对燃烧速率及剧烈程度的催化效应,以及不同点火能量、活性基团浓度对缓燃转爆震(DDT)过程的影响.结合氢气-空气燃烧23步化学反应动力学机制,采用FLUENT软件对不同工况下的DDT过程进行模拟,与理论分析结果对比.结果表明:点火温度为2000~2500K时,活性基团的加入,可提高燃烧速率,DDT时间可缩短9.91%~21.08%,DDT距离可缩短3.32%~8.08%,DDT时间和DDT距离的改变幅度随点火温度的升高而增大.点火能量较高时应该考虑气体电离效应.
The composition of ionization of hydrogen-air mixture gas was deduced by gas ionization theory. The catalytic effect of active groups on combustion rate and severity was theoretically analyzed, and the effects of different ignition energies and active groups concentration on ignition-knock-detonation (DDT) .According to the kinetic mechanism of 23-step hydrogen-air combustion reaction, FLUENT software was used to simulate the DDT process under different conditions, which was compared with the theoretical analysis.The results show that when the ignition temperature is 2000 ~ 2500K, the active groups , The DDT time can be shortened by 9.91% ~ 21.08%, the DDT distance can be shortened by 3.32% ~ 8.08%, and the change range of DDT time and DDT distance increases with the increase of ignition temperature. Should consider the gas ionization effect.