Abstract The use of hydrogen enriched fuel blends, e.g. syngas, offers great potential in the decarbonisation of gas turbine technologies by substitution and expansion of the lean operating limit. Studies assessing explosion risks or laminar flame properties of such fuels are common. However, there is a lack of experimental data that quantifies the impact of hydrogen addition on turbulent flame parameters including burning velocities and scalar fluxes. Such properties are here determined for aerodynamically stabilised flames in a back-to-burnt opposed jet configuration featuring fractal grid generated multi-scale turbulence ( Re t = 314 ± 19 ) using binary H 2 / C H 4 and H 2 /CO fuel blends. The binary H 2 / C H 4 fuel blend is varied from α = X H 2 / ( X H 2 + X F ) = 0.0, 0.2 and 0.4–1.0, in steps on 0.1, and the binary H 2 /CO fuel blend from α = 0.3 − 1 . 0 also in steps of 0.1. The equivalence ratio is adjusted between the mixture specific lower limit of local flame extinction and the upper limit of flashback. The flames are characterised using PIV measurements combined with a flame front detection algorithm. The study quantifies the impact of hydrogen enrichment on (i) turbulent burning velocity ( S T ), (ii) turbulent transport and (iii) the rate of strain acting on flame fronts. Scaling relations (iv) that correlate S T with laminar flame properties are evaluated and (v) flow field data that permits validation of computational models is provided. It is shown that C H 4 results in a stronger inhibiting effect on the reaction chemistry of H 2 compared to CO, that turbulent transport and burning velocities are strongly correlated with the rate of compressive strain and that scaling relationships can provide reasonable agreement with experiments.

中文翻译：

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富氢湍流火焰的反应性

摘要 使用富氢燃料混合物，例如合成气，通过替代和扩大稀薄操作极限，在燃气轮机技术的脱碳方面提供了巨大的潜力。评估此类燃料的爆炸风险或层流火焰特性的研究很常见。然而，缺乏量化添加氢对湍流火焰参数（包括燃烧速度和标量通量）的影响的实验数据。此处确定了具有分形网格生成的多尺度湍流 (Re t = 314 ± 19) 的回燃对置射流配置中的空气动力学稳定火焰的这些特性，使用二元 H 2 / CH 4 和 H 2 /CO 燃料混合物。二元 H 2 / CH 4 燃料混合物的变化范围为 α = XH 2 / ( XH 2 + XF ) = 0.0、0.2 和 0.4–1.0，以 0.1 为步长，和二元 H 2 /CO 燃料混合物来自 α = 0.3 - 1 。0 也以 0.1 为步长。当量比在混合物特定局部火焰熄灭下限和回火上限之间调整。使用 PIV 测量结合火焰前沿检测算法来表征火焰。该研究量化了富氢对 (i) 湍流燃烧速度 (ST)、(ii) 湍流传输和 (iii) 作用于火焰前沿的应变率的影响。评估将 ST 与层流火焰属性相关联的比例关系 (iv)，并提供 (v) 允许验证计算模型的流场数据。结果表明，与 CO 相比，CH 4 对 H 2 的反应化学具有更强的抑制作用，