Unstretched unburned flame speed and burned gas Markstein length of diluted hydrogen/air mixtures
Unstretched unburned flame speed and burned gas Markstein length of diluted hydrogen/air mixtures
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DOI：
10.1016/j.ijhydene.2021.12.217
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发表时间：
2022-01
影响因子：
7.2
通讯作者：
B. Duva;E. Toulson
中科院分区：
文献类型：
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作者：
B. Duva;E. Toulson
在1-2 bar、373-473 K、当量比为0.7、稀释比为0- 40%的条件下，对添加实际H2/空气燃烧残余物（65%N2 + 35%H2O的混合物）的H2/空气火焰的基本燃烧特性进行了实验和数值研究。在恒定压力下对球形膨胀火焰的测量表明，火焰速度和绝热火焰温度随稀释剂水平的增加几乎呈线性下降。详细的数值模拟和灵敏度系数的分析表明，这是因为稀释混合物的低化学反应性。另一方面，发现燃烧气体Markstein长度随稀释混合物添加的变化更复杂，并且不能用线性趋势表示。实验火焰速度的数据进行比较，以评估这些模型的准确性，通过几种化学机制得到的化学动力学分析的结果。
Fundamental combustion characteristics of H2/air flames with the addition of actual H2/air combustion residuals (a mixture of 65% N2+ 35% H2O by mole) are examined experimentally and numerically at 1–2 bar, 373–473 K, equivalence ratio of 0.7, and dilution ratios of 0–40%. Spherically expanding flame measurements at constant pressure show that flame speed and adiabatic flame temperature drop almost linearly with increasing diluent level. Detailed numerical simulations and analyses of sensitivity coefficients reveal that this is because of the low chemical reactivity of the dilution mixture. On the other hand, the change in burned gas Markstein length with the dilution mixture addition is found more complex and cannot be represented with a linear trend. Experimental flame speed data are compared with results of chemical kinetic analyses obtained by several chemical mechanisms in order to assess the accuracy of these models.