为进一步探索燃烧室中等离子体助燃的效果,建立圆筒形实验燃烧室模型,利用Fluent软件对等离子体助燃条件下甲烷/空气混合气燃烧过程进行了数值仿真。通过改变当量比、电离度及进口气流速度,计算得燃烧室内温度流场分布。结果表明,等离子体助燃能增大火焰传播速度,提高混合气燃烧温度;非化学恰当比状态下等离子体助燃的燃烧温度下降;富燃时助燃效果比贫燃时强;增大电离度或减小进口气流速度,等离子体助燃效果增强。

In order to analyze effect of plasma assisted combustion in combustor, a cylindrical combustor model was set up by using Fluent software, and numerical simulation of plasma assisted combustion was conducted. By changing equivalence ratio, ionization degree and inlet velocity, the temperature distribution in combustor was achieved after calculation. The results indicate that plasma assisted combustion could effectively increase flame propagation velocity and combustion temperature of methane-air mixture. Non-stoichiometric ratio condition would decrease the plasma assisted combustion temperature. The effect of plasma assisted combustion is more significant under fuel-rich condition than that under fuel-lean condition. Either increasing ionization degree or decreasing inlet velocity could enhance the effect of plasma assisted combustion.