CH <sub>4</sub>，压力和初始温度对NH <sub>3-</sub>空气混合物层流火焰速度的影响,ACS Omega

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CH ₄，压力和初始温度对NH _3-空气混合物层流火焰速度的影响
ACS Omega ( IF 3.7 ) Pub Date : 2021-04-26 , DOI: 10.1021/acsomega.1c00080
Xiaolei Zhang ₁ , Jingfu Wang ₁ , Ying Chen ₁ , Conghao Li ₁

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氨（NH ₃）不仅有望用作氢能载体，而且有望成为无碳燃料。甲烷（CH ₄）可以用作燃烧增强剂，以改善NH ₃的燃烧强度。另外，重要的是要了解NH _3-空气在升高的压力和温度下的火焰特性。数值研究了NH ₃ -CH _4-空气的层流火焰速度，其中二元燃料中CH ₄的摩尔分数为0％至50％，压力和初始温度分别高达10 atm和1000K。Okafor机制的计算值与实验数据非常吻合。CH₄燃料中的火焰通过改变火焰中自由基的主要种类而影响火焰速度；高压不仅增加了火焰中的限速反应速率，而且减少了火焰中H，O和OH自由基的数量，从而抑制了火焰的传播。在较高的初始温度下，较快的火焰速度主要归因于较高的绝热火焰温度。层流火焰速度相关方程与模拟结果具有一致的趋势，尽管在较高的压力和温度下略有低估。对于给定的压力和温度，这是一种更有效的方法来计算NH _3-空气的层流火焰速度。

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Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3–Air Mixture

Ammonia (NH₃) is not only expected to be used as a hydrogen energy carrier but also expected to become a carbon-free fuel. Methane (CH₄) can be used as a combustion enhancer for improving the combustion intensity of NH₃. In addition, it is important to understand the flame characteristics of NH₃–air at elevated pressures and temperatures. The laminar flame speed of NH₃–CH₄–air is numerically investigated, where the mole fraction of CH₄ ranges from 0 to 50% in binary fuels and the pressure and initial temperature are up to 10 atm and 1000 K, respectively. The calculated value from the Okafor mechanism is in excellent agreement with experimental data. The CH₄ in the fuel affects the flame speed by changing the main species of free radicals in the flame; the high pressure not only increases the rate-limiting reaction rate in the flame but also reduces the amount of H, O, and OH radicals in the flame, so as to restrain the propagation of the flame. At a higher initial temperature, the faster flame speed is mainly due to the higher adiabatic flame temperature. The laminar flame speed correlation equation has a consistent trend with the simulation results, though with a slight underestimation at higher pressures and temperatures. It is a more effective way to calculate the laminar flame speeds of NH₃–air for a given pressure and temperature.

更新日期：2021-05-11

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