Flame front structure and burning velocity of turbulent premixed CH4/H2/air flames
Flame front structure and burning velocity of turbulent premixed CH4/H2/air flames
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CH4/H2/空气预混紊流火焰的火焰锋结构和燃烧速度
DOI：
10.1016/j.ijhydene.2013.05.051
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发表时间：
2013-08
影响因子：
7.2
通讯作者：
Zhilong Wei, Zuohua Huang, Kobayashi Hideaki
中科院分区：
文献类型：
--
作者：
Zhang Meng, Wang Jinhua*, Xie Yongliang, Jin Wu;Zhilong Wei, Zuohua Huang, Kobayashi Hideaki
采用OH-PLIF技术研究了不同氢含量下CH 4/H2/空气湍流预混火焰的火焰前缘结构。为了获得稳定的湍流预混火焰，采用了一种新型的燃烧器。分别采用热线风速仪和OH-PLIF观测技术对湍流流动和火焰阵面结构进行了测量。研究了0%、5%、10%和20%的氢分数。结果表明，湍流预混火焰的火焰阵面结构与层流火焰阵面结构相比，是具有小尺度凹凸结构的褶皱火焰阵面。随着湍流度和氢气含量的增加，火焰前缘的褶皱强度增加。氢气的加入促进了火焰的内禀不稳定性，导致层流火焰对湍流的主动响应，导致火焰前缘结构更加褶皱。ST/SL值随′/SL和氢分数的增加而单调增加。ST/SL随氢含量的增加而增加主要是由于以有效刘易斯数Leeff为代表的扩散热不稳定效应。由实验数据拟合得到的ST/S_L和U ′/S_L之间的关系式为ST/S_L = a（u′/S_L）_n，其指数n在所有条件和不同氢分率下均为0.35。
Flame front structure of turbulent premixed CH4/H2/air flames at various hydrogen fractions was investigated with OH-PLIF technique. A nozzle-type burner was used to achieve the stabilized turbulent premixed flames. Hot-wire anemometer measurement and OH-PLIF observation were performed to measure the turbulent flow and detect the instantaneous flame front structure, respectively. The hydrogen fractions of 0%, 5%, 10% and 20% were studied. Results show that the flame front structures of the turbulent premixed flames are wrinkled flame front with small scale convex and concave structures compared to that of the laminar-flame front. The wrinkle intensity of flame front is promoted with the increase of turbulence intensity as well as hydrogen fraction. Hydrogen addition promotes the flame intrinsic instability which leads to the active response of laminar flame to turbulence and results in the much more wrinkled flame front structure. The value ofST/SLincreases monotonically with the increase ofu′/SLand hydrogen fraction. The increase ofST/SLwith the increase of hydrogen fraction is mainly attributed to the diffusive-thermal instability effects represented by the effective Lewis number, Leeff. A general correlation betweenST/SLandu′/SLis provided from the experimental data fitting in the form ofST/SL∝a(u′/SL)n, and the exponent,n, gives the constant value of 0.35 for all conditions and at various hydrogen fractions.
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