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H_2/O_2/Ar可燃气体激光诱导火花点火的实验研究 被引量：2

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摘要 对H2/O2/Ar可燃气体激光诱导火花点火进行了实验研究.采用Nd:YAG激光器产生的532nm激光聚焦击穿气体点火,并采用激光高速纹影系统对不同初压、激光点火能量、氩稀释度可燃气体点火的火焰结构进行了流场显示.结果表明,气体击穿形成椭球形等离子体,稀疏波与等离子体作用,在等离子体迎光侧和背光侧分别形成一对反旋的螺旋环,导致等离子体和随后的火焰面向内弯缺,在等离子体左侧激光轴附近形成一个向外凸出的气瓣.等离子体的高温气体诱导火花核的形成,受壁面反射弱激波或压缩波的作用,初始层流火焰减速.弧形火焰阵面与壁面的作用及其与激波或压缩波、稀疏波等作用,导致层流火焰向湍流火焰转捩.对摩尔比为2:1:10、初压为53.33kPa,激光诱导火花点火的激光器最小输出能量为15mJ.随预混气初压的升高,激光点火能量越高,降低氩稀释度,会加快火焰阵面传播速度.
作者 王昌建 徐胜利 贾光明
机构地区 中国科学技术大学力学和机械工程系
出处 《中国科学（E辑）》 CSCD 北大核心 2007年第11期1461-1468,共8页 Science in China(Series E)
关键词 激光诱导火花点火 高速纹影照相 等离子体 稀疏波 层流火焰
分类号 TH744.5 [机械工程—光学工程]
  • 相关文献

参考文献17

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二级参考文献28

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共引文献27

同被引文献22

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引证文献2

二级引证文献2

中国科学（E辑）
2007年 第11期

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