非均匀电场对火焰传播速率的影响

在定容燃烧装置上,通过改变加载电压和电极结构形成了不同的非匀强电场,由此研究了电场对预混层流火焰形状和传播速率的影响.结果表明:在非均匀电场下,尖-网电极对应的火焰形状发生了显著变化,尖-柱电极对应的火焰形状变化较小；受离子风的影响,沿电场方向的火焰水平方向传播速率增加,加载电压越大,火焰水平方向传播速率增加得越多；当加载电压为-5 kV、-10kV、-12 kV时,尖-网电极对应的水平方向平均传播速率分别增加了10.4％、23.7％、34.1％,尖-柱电极对应的水平方向平均传播速率分别增加了2.5％、7.5％、8.8％；加载电压相同时,尖-网电极比尖-柱电极对应的火焰水平方向传播速率增加得更多.

Effect of Non-Uniform Electric Fields on Flame Propagation Speed

The experiment was conducted to investigate the effect of non-uniform electric fields on premixed laminar flame shape and propagation speed in a constant volume combustion device by changing applied voltage and electrode structure to create the different non-uniform electric fields.The results show that,in the non-uniform electric fields,the flame shape corresponding to tip-net electrodes changed significantly and the flame shape corresponding to tip-column electrodes changed slightly.The horizontal flame propagation speed increased in the field direction by the ionic wind effect.The increase in the horizontal flame propagation speed rose with an increase in the absolute value of applied voltage.When the applied voltage was-5 kV,-10 kV and-12 kV,the average flame propagation speed in the horizontal direction corresponding to tip-net electrodes increased by 10.4%,23.7% and 34.1%,and the average flame propagation speed corresponding to tip-column electrodes increased by 2.5%,7.5% and 8.8%,respectively.In addition,the horizontal flame propagation speed corresponding to tip-net electrodes increased more at the same applied voltage.