Laminar Burning Velocity of Stoichiometric CH4/air Premixed Flames at High-Pressure and High-Temperature
Laminar Burning Velocity of Stoichiometric CH4/air Premixed Flames at High-Pressure and High-Temperature
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DOI：
10.1299/jsmeb.48.603
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
Yasuhiro Ogami;Hideaki Kobayashi
中科院分区：
文献类型：
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作者：
Yasuhiro Ogami;Hideaki Kobayashi
在高压和高温下对化学计量 CH4/空气火焰的层流燃烧速度进行了实验和数值研究。用氦气稀释化学计量的 CH4/空气混合物，以抑制高压下发生的固有火焰不稳定性。燃烧器稳定火焰的层流燃烧速度的测量是通过同时采用粒子跟踪测速（PTV）和羟基自由基平面激光诱导荧光（OH-PLIF）的技术进行的，该技术测量瞬时局部燃烧速度。层流燃烧速度由卡洛维茨数足够小的区域的局部燃烧速度的平均值决定，这意味着火焰拉伸和曲率的影响可以忽略不计。还使用一维预混合火焰代码进行了数值模拟。研究了详细的反应机理和四步还原机理，并将其结果与实验结果进行比较，探讨基于反应机理预测高压高温火焰特性的可行性。
Experimental and numerical studies on laminar burning velocities of stoichiometric CH4/air flames were performed at high pressure and high temperature. A stoichiometric CH4/air mixture was diluted by helium in order to restrain the intrinsic flame instabilities occurring at high pressure. Measurements of laminar burning velocity for burner-stabilized flames were conducted by a technique employing particle tracking velocimetry (PTV) and planar laser induced fluorescence for OH radical (OH-PLIF) simultaneously, which measures the instantaneous local burning velocity. Laminar burning velocities were determined by the average values of local burning velocities in the region where the Karlovitz number are sufficiently small, meaning that the effect of flame stretch and curvature can be neglected. Numerical simulations were also conducted using a one-dimensional premixed flame code. Detailed reaction mechanisms and the 4-step reduced mechanism were examined, and their results were compared with experimental results to investigate the feasibility of predicting the flame characteristics at high pressure and high temperature, based on the reaction mechanisms.