DME（二甲醚CH3OCH3）湍流喷射火焰的实验和数值模拟研究

2017/02/27   下载量： 4 次

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美国著名科研单位，圣地亚国家实验室采用LaVision公司的平面激光诱导荧光测试系统（PLIF）对本生灯的火焰进行了OH和甲醛自由基的空间分布的同时测量。激光源采用美国光谱物理公司的Pro 290型大能量Nd:YAG激光器。紫外355nm输出能量达到500毫焦。采用透镜耦合的图像增强器IRO测量微弱的荧光信号。

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Results are presented here from a three-dimensional direct numerical simulation of a temporallyevolving
planar slot jet flame and experimental measurements within a spatially-evolving axisymmetric
jet flame operating with DME (dimethyl ether, CH3OCH3) as the fuel. Both simulation and experiment
are conducted at a Reynolds number of 13050. The Damko¨ hler number, stoichiometric mixture fraction
and fuel and oxidizer compositions also are matched between simulation and experiment. Simultaneous
OH=CH2O PLIF imaging is performed experimentally to characterize the spatial structure of the turbulent
DME flames. The simulation shows a fully burning flame initially, which undergoes partial extinction and
subsequently, reignition. The scalar dissipation rate (v) increases to a value much greater than that
calculated from near-extinction strained laminar flames, leading to the observed local extinction. As the
turbulence decays, the local values of v decrease and the flame reignites. The reignition process appears
to be strongly dependent on the local v value, which is consistent with previous results for simpler fuels.
Statistics of OH and CH2O are compared between simulation and experiment and found to agree. The
applicability of OH=CH2O (formaldehyde) product imaging as a surrogate for peak heat release rate is
investigated. The concentration product is found to predict peak heat release rate extremely well in the
simulation data. When this product imaging is applied to the experimental data, a similar extinction/
reignition pattern also is observed in the experiments as a function of axial position. A new 30-species
reduced chemical mechanism for DME was also developed as part of this work.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 依据湍流预混火焰2D平面激光诱导荧光成像测量结果估算3D火焰表面密度和全局燃料消耗速率

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北京欧兰科技发展有限公司
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