Enhanced combustion characteristics of combustor head based on gliding arc
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摘要:
为了研究基于滑动弧的燃烧室头部强化燃烧效果,探究了燃烧室头部的点火过程以及不同等离子体电源输入功率下的点/熄火边界,利用像增强系统获得了CH*基团的分布云图。实验结果表明:输入功率的增大使得燃烧室的点/熄火边界均得到拓展,与160 W工况相比,输入功率为320 W时,点火边界平均拓宽约17.6%,与未放电相比,输入功率为320 W时,熄火边界平均拓宽约45.3%,滑动弧放电对熄火边界拓宽效果明显;当滑动弧能够点燃来流新鲜混合气时,输入功率的增加使得CH*基团分布向上游移动,当输入功率为320 W时,燃烧火焰驻留在燃烧室头部,当滑动弧激励器仅具有助燃作用时,输入功率的增加使得局部CH*基团辐射强度增强,热释放速率增加。
Abstract:In order to study the combustion enhancement effect of combustor head based on gliding arc,the ignition process of combustor head and the ignition/flameout boundary under different plasma power inputs were explored,and the cloud images of CH* group were obtained by image enhancement system.The experimental results showed that with the increase of input power,the ignition/flameout boundary of combustor was expanded.Compared with 160 W,when the input power was 320 W,the ignition boundary was widened by about 17.6% on average.Compared with 0 W,when the input power was 320 W,the flameout boundary was widened by about 45.3% on average,and the gliding arc discharge had obvious effect on widening flameout boundary.When the gliding arc successfully ignited the fresh gas mixture flowing through it,the increase of input power made the CH* group distribution move upstream.When the input power was 320 W,the combustion flame was stuck around the head of the combustor.When the gliding arc exciter had only combustion⁃supporting function,the increase of input power made the local CH* group radiation intensity increase and the heat release rate increase.
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Key words:
- gliding arc /
- plasma /
- ignition boundary /
- flameout boundary /
- burning flame
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