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Performance Evaluation of H2/Air Premixed Combustion in a Suddenly Expanded Microcombustor with Wall Fin
Energy Technology ( IF 3.6 ) Pub Date : 2021-08-10 , DOI: 10.1002/ente.202100294 Arees Qamareen 1 , Shahood S Alam 1 , Mubashshir A Ansari 1
Energy Technology ( IF 3.6 ) Pub Date : 2021-08-10 , DOI: 10.1002/ente.202100294 Arees Qamareen 1 , Shahood S Alam 1 , Mubashshir A Ansari 1
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Herein, a 2D, axisymmetric microcombustor with a backward-facing step and triangular wall fin is considered for enhancement of combustor performance. The outer wall temperature, combustor efficiency, and pressure characteristics of the microcombustor are numerically investigated with a detailed chemical kinetic mechanism and conjugate heat transfer. The proposed microcombustors with variable blockage ratios, wall fin shapes, and locations are analyzed with respect to flow and combustion interaction, along with heat flux exchange between the flame and combustor wall. Combustion performance is also evaluated by means of the amount of heat transferred through the combustor wall, conversion ratio of input chemical energy to exploitable heat, and OH mass fraction distributions. Standard k–ε turbulence along with 9 species and the 19-step combustion reaction scheme is implemented using the eddy dissipation concept (EDC) model in the numerical study. The results indicate that the wall fin blockage ratio alters the reaction zone and improves combustor performance significantly at lower inlet velocities (4–20 m s−1). The fin location and shape are observed to influence the temperature distribution. However, the higher blockage ratio adversely impacts the combustion characteristics at the higher inlet velocity, that is, 48 m s−1.
中文翻译：
带壁翅片突然膨胀微型燃烧器中H2/空气预混燃烧的性能评价
在此，考虑了具有向后台阶和三角形壁翅片的二维轴对称微型燃烧器以提高燃烧器性能。通过详细的化学动力学机制和共轭传热，对微型燃烧器的外壁温度、燃烧器效率和压力特性进行了数值研究。针对流动和燃烧相互作用以及火焰和燃烧器壁之间的热通量交换，对具有可变阻塞率、壁翅形状和位置的拟议微型燃烧器进行了分析。燃烧性能还通过通过燃烧器壁传递的热量、输入化学能到可利用热量的转化率以及 OH 质量分数分布来评估。标准k–ε在数值研究中使用涡耗散概念 (EDC) 模型实施湍流以及 9 种物质和 19 步燃烧反应方案。结果表明，壁翅片阻塞率改变了反应区并在较低的入口速度（4-20 m s -1）下显着提高了燃烧器性能。观察到翅片的位置和形状会影响温度分布。然而，较高的堵塞比不利地影响较高入口速度下的燃烧特性，即，48 m s -1。
更新日期：2021-10-08
中文翻译：
带壁翅片突然膨胀微型燃烧器中H2/空气预混燃烧的性能评价
在此，考虑了具有向后台阶和三角形壁翅片的二维轴对称微型燃烧器以提高燃烧器性能。通过详细的化学动力学机制和共轭传热，对微型燃烧器的外壁温度、燃烧器效率和压力特性进行了数值研究。针对流动和燃烧相互作用以及火焰和燃烧器壁之间的热通量交换，对具有可变阻塞率、壁翅形状和位置的拟议微型燃烧器进行了分析。燃烧性能还通过通过燃烧器壁传递的热量、输入化学能到可利用热量的转化率以及 OH 质量分数分布来评估。标准k–ε在数值研究中使用涡耗散概念 (EDC) 模型实施湍流以及 9 种物质和 19 步燃烧反应方案。结果表明，壁翅片阻塞率改变了反应区并在较低的入口速度（4-20 m s -1）下显着提高了燃烧器性能。观察到翅片的位置和形状会影响温度分布。然而，较高的堵塞比不利地影响较高入口速度下的燃烧特性，即，48 m s -1。
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