Stabilization of a premixed methane-air flame with a high repetition nanosecond laser-induced plasma
Stabilization of a premixed methane-air flame with a high repetition nanosecond laser-induced plasma
复制标题
高重复纳秒激光诱导等离子体稳定预混合甲烷-空气火焰
DOI：
10.1016/j.optlastec.2017.01.001
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发表时间：
2017-07
影响因子：
5
通讯作者：
孙锐
中科院分区：
文献类型：
--
作者：
于杨;李晓晖;安小康;于欣;樊荣伟;陈德应;孙锐
激光诱导等离子体点火技术已在多种燃烧系统中得到应用，但利用重复激光诱导等离子体（LIP）稳定火焰的研究还相当有限。本文报道了高重复频率纳秒级LIP对甲烷-空气预混火焰的稳定作用。研究了不同激光重复频率下等离子体能量耦合和火焰核随时间的演化，1 Hz、100 Hz和250 Hz。等离子体能量耦合在空气流和甲烷-空气预混流中不受激光重复率的影响。连续燃烧火焰稳定已经实现了100 Hz和250 Hz的LIP，在追赶和合并的连续火焰核心。由最后一个LIP形成的火焰核不影响由下一个LIP新形成的火焰核的演化。的追赶距离，定义为从LIP的起始位点的火焰核心追赶位置的距离，估计为不同的激光重复率的基础上的火焰核心的时间演化。较高的激光重复频率将导致较短的追赶距离，这有利于火焰稳定。实现有效火焰稳定的激光重复率的上限由从LIP的开始到最初逆流传播的下前缘返回到LIP引发位点的临界脉冲间延迟确定。在本工作的流动条件下（当量比为1，流速为2 m/s，雷诺数为1316），上限为377 Hz。
Laser-induced plasma ignition has been applied in various combustion systems, however, work on flame stabilization with repetitive laser-induced plasma (LIP) is rather limited. In this paper, stabilization of a premixed methane-air flame with a high repetition nanosecond LIP is reported. The plasma energy coupling and the temporal evolution of the flame kernels generated by the LIPs are investigated with different laser repetition rates, i.e., 1 Hz, 100 Hz and 250 Hz, respectively. The plasma energy coupling is not affected in the air flow and in the premixed methane-air flow with the applied laser repetition rates. Continuous combustion flame stabilization has been achieved with LIPs of 100 Hz and 250 Hz, in terms of catch-up and merging of the consecutive flame kernels. The flame kernel formed by the last LIP does not affect the evolution of the newly formed flame kernel by the next LIP. The catch-up distance, defined as the distance from the LIP initiation site to the flame kernel catch-up position, is estimated for different laser repetition rates based on the temporal evolution of the flame kernels. A higher laser repetition rate will lead to a shorter catch-up distance which is beneficial for flame stabilization. The up limit for the laser repetition rate to realize effective flame stabilization is determined from the critical inter-pulse delay defined from the onset of the LIP to the return of the initially contraflow propagating lower front to the LIP initiation site. The up limit is 377 Hz under the flow conditions of this work (equivalence ratio of 1, flow speed of 2 m/s, and Reynolds number of 1316).
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DOI：
10.1115/1.2906184
发表时间：
2008-07
影响因子：
1.5
作者：
A. Yalin;S. Joshi;M. Defoort;B. Willson
通讯作者：
A. Yalin;S. Joshi;M. Defoort;B. Willson
DOI：
10.1364/lic.2015.th2a.2
发表时间：
2015-04
期刊：
--
影响因子：
--
作者：
Xiaohui Li;R. Fan;Yang Yu;Xin Yu;Deying Chen;Rui Sun
通讯作者：
Xiaohui Li;R. Fan;Yang Yu;Xin Yu;Deying Chen;Rui Sun
影响因子：
3.6
作者：
Xin Yu;Jiangbo Peng;Rui Sun;Xiaochuan Yang;Chunhong Wang;Junfeng Sun;Xiaohui Li;Boyang Jia;Yongpeng Zhao;Deying Chen
通讯作者：
Xin Yu;Jiangbo Peng;Rui Sun;Xiaochuan Yang;Chunhong Wang;Junfeng Sun;Xiaohui Li;Boyang Jia;Yongpeng Zhao;Deying Chen
影响因子：
7.2
作者：
M. Weinrotter;H. Kopecek;E. Wintner;M. Lackner;F. Winter
通讯作者：
M. Weinrotter;H. Kopecek;E. Wintner;M. Lackner;F. Winter
影响因子：
4.4
作者：
T. A. Spiglanin;A. Mcilroy;E. Fournier;R. B. Cohen;J. Syage
通讯作者：
T. A. Spiglanin;A. Mcilroy;E. Fournier;R. B. Cohen;J. Syage