微燃烧器内氢气及甲烷/氢气燃烧的数值模拟

doi:10.12068/j.issn.1005-3026.2024.08.004

摘要/Abstract

摘要：

为了实现气体在微燃烧器中稳定燃烧的同时还可以获得高且均匀的外壁面温度分布，建立了气体在具有后向台阶微燃烧器中的燃烧模型.首先研究了后向台阶数量对微燃烧的影响，其次研究了不同氢气比例下，甲烷/氢气在具有3个后向台阶微燃烧器中的燃烧特性.结果表明：后向台阶结构能够稳定火焰；当气体的入口速度为3 m/s时，具有3个后向台阶微燃烧器可以燃烧的当量比范围（0.3~5.0）比具有1个后向台阶微燃烧器可以燃烧的当量比范围（0.5~4.6）大；后向台阶结构虽提高了外壁面温度，但使外壁面温差变大，降低了温度的均匀性；在氢气中加入一定比例的甲烷，既减缓了混合气的燃烧反应速度，又获得了高的外壁面温度和能量输出.

关键词: 微尺度燃烧, 后向台阶, 掺混燃烧, 燃烧特性, 稳定燃烧

Abstract:

In order to achieve stable combustion of gas in micro?burners and obtain high and uniform temperature distribution on the outer wall， a combustion model of gas in micro?burners with backward steps was established. Firstly， the influence of the number of backward steps on micro?combustion was studied. Secondly， the combustion characteristics of methane/hydrogen in micro?burners with three backward steps under different hydrogen ratios were studied. The results show that the backward step structure can stabilize the flame. When the inlet velocity of the gas is 3 m/s， the equivalent ratio range （0.3~5.0） of the gas with three backward steps is larger than that （0.5~4.6） with one backward step. Although the backward step structure increases the temperature of the outer wall， the temperature difference of the outer wall becomes larger， and the temperature uniformity is reduced. Adding a certain proportion of methane to hydrogen not only slows down the combustion reaction rate of the mixture， but also obtains higher outer wall temperature and energy output.

Key words: microscale combustion, backward step, blended combustion, combustion characteristics, steady combustion

中图分类号:

TK 16

孙心茹, 孙岳, 阎富生, 刘慧. 微燃烧器内氢气及甲烷/氢气燃烧的数值模拟[J]. 东北大学学报（自然科学版）, 2024, 45(8): 1088-1095.

Xin-ru SUN, Yue SUN, Fu-sheng YAN, Hui LIU. Numerical Simulation of Hydrogen and Methane/Hydrogen Combustion in Micro-burners[J]. Journal of Northeastern University(Natural Science), 2024, 45(8): 1088-1095.

图/表 14

图1 不同后向台阶微燃烧器的几何形状（a）—具有1个后向台阶；（b）—具有2个后向台阶；（c）—具有3个后向台阶.

Fig. 1 The geometry of micro?burners with different backward steps

图2 不同网格数量模型下微燃烧器中心线气体温度分布

Fig. 2 Gas temperature distribution on the center line of micro?burners under models of different grids

图3 模拟结果和实验结果的比较

Fig. 3 Comparison between simulation and experimental results

图4 微燃烧器的XY平面温度云图及气体流线分布（a）—具有1个后向台阶；（b）—具有2个后向台阶；（c）—具有3个后向台阶.

Fig. 4 XY plane temperature cloud images and gas streamline distribution of micro?burners

图5 微燃烧器的中心线气体温度和羟基摩尔分数分布

Fig. 5 Distribution of centerline gas temperature and

图6 不同微燃烧器可以燃烧的当量比范围

Fig. 6 The ranges of combustion equivalent ratio for different micro?burners

图7 不同后向台阶结构微燃烧器的外壁面温度分布

Fig. 7 Outer wall temperature distribution of micro‐ burners with different backward steps

图8 不同后向台阶结构微燃烧器中氢气的燃烧效率

Fig. 8 Combustion efficiency of hydrogen in micro‐ burners with different backward steps

图9 不同氢气比例下的XY面温度云图和等值线分布

Fig. 9 Temperature cloud map and contour distribution of XY plane at different hydrogen ratios

图10 不同氢气比例下的动力学速率

Fig. 10 Kinetic rate under different hydrogen ratios

图11 不同氢气比例下微燃烧器外壁面温度分布

Fig. 11 Temperature distribution on the outer wall of micro?burners under different hydrogen ratios

图12 微热光伏系统示意图

Fig. 12 Schematic diagram of the micro?thermo? photovoltaic system

图13 氢气比例对能量输出的影响

Fig. 13 Influence of hydrogen ratio on energy output

图14 不同氢气比例下的能量效率

Fig. 14 Energy efficiency under different hydrogen ratios

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