The premixed combustion of a lean hydrogen-air mixture is analyzed in this study to examine various properties and flame stabilization. A two-dimensional (2D) analysis of a microscale combustor is performed with various shapes of bluff bodies (e.g., circular and triangular). Nine bluff bodies are placed at the entrance of the microscale combustor and solved with 2D governing equations. The analysis is performed with the three velocities of 10, 20, and 30 m/s, but the equivalence ratio is fixed in all cases. The various characteristics of the microscale combustor are studied such as the temperature of the wall, difference in peak temperature, the mean velocity at the outlet, and temperature of the exhaust gases. Flame stabilization depends on various factors such as bluff body shape and size, and the velocity of the fuel-air mixture at the inlet and recirculation zone. In comparison to all bluff body cases, we observe that the wall blade bluff body is the most efficient (low exhaust gas temperature, large recirculation zone, low mean velocity at the outlet of the microcombustor, and high wall temperature) compared with all eight other bluff body cases. Combustion efficiency is directly proportional to the wall temperature, meaning that the microcombustor with wall blade bluff bodies is more efficient with a stabilized flame. The simulation results are compared with published data on an L/D ratio of 15.
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机译：精益hydrogen-air的预混合燃烧混合物在这项研究检查分析各种属性和火焰稳定。微尺度的二维(2 d)分析各种形状的燃烧室与执行虚张声势的身体(例如,圆形和三角形)。九虚张声势的身体被放置的入口处微型燃烧室和解决与2 d控制方程。三种速度的10、20和30 m / s,但等价比率在所有情况下都是固定的。各种微尺度的特性燃烧室的温度等进行了研究墙上,峰值温度的差异,在出口平均速度和温度废气。钝头体形状和等各种因素大小和速度的燃料空气混合物进口和再循环区。所有钝头体情况下,我们观察到墙上叶片钝头体是最有效的(低废气温度、大的再循环区,平均速度低的出口microcombustor,高墙温度)与所有其他八个虚张声势的身体情况。燃烧效率成正比墙上的温度,这意味着microcombustor墙叶片虚张声势的身体更高效的稳定的火焰。仿真结果与出版15 L / D比率数据。
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