Infrared visualization was employed to observe the decay of a hydrogen-air flame front propagating in a narrow gap similar to a Hele-Shaw cell. Based on the images, the flame front speeds and sizes for mixtures with hydrogen concentrations of 7 % and 10 % by volume in gaps with widths of 3–5 mm were calculated. The shapes of the individual cells formed were determined, the mechanism of flame front decay due to the critical influence of diffusive-thermal instability was described, and a criterion for flame front decay was proposed. The obtained results may be used in the design of fuel cells and MEMS hydrogen devices to ensure the safety of their operation.

中文翻译：

---

氢空气火焰前沿衰变到狭窄水平间隙中的杯状单元


采用红外可视化来观察在类似于 Hele-Shaw 单元的狭窄间隙中传播的氢空气火焰前缘的衰变。根据图像，计算了宽度为 3-5 mm 的间隙中氢浓度为 7 % 和 10 %（体积计）的混合物的火焰前沿速度和尺寸。确定了形成的单个单元的形状，描述了由于扩散热不稳定性的临界影响而导致的火焰前部衰变的机制，并提出了火焰前部衰变的标准。所获得的结果可用于燃料电池和 MEMS 氢气装置的设计，以确保其运行安全。