燃料轴向分级(Axial Fuel Staging, AFS)燃烧技术是目前重型燃机的先进低污染燃烧技术。为了揭示掺氢比对轴向分级燃烧火焰形态矩阵和火焰结构的影响，使用OH*基自发光技术，探究常压条件下，二级热负荷在9kW~24.4kW、掺氢比0~0.8范围内二级火焰形态的变化规律，并在此基础上详细的研究了火焰结构随掺氢比的变化规律。研究发现:在二级燃料掺氢的条件下掺氢比成为二级火焰形态的主导因素，在低掺氢比下湍流火焰传播速度增加更加明显，在高掺氢比下效果减弱，火焰脉动随着掺氢比增加得到明显抑制。

Axial Fuel Staging (AFS) combustion technology is an advanced low-emission combustion strategy for modern heavy-duty gas turbines. To elucidate the influence of the hydrogen blending ratio on the flame morphology matrix and structure in axially staged combustion, OH* chemiluminescence imaging was employed. This study investigated the variations in secondary flame morphology under atmospheric pressure, across a secondary stage thermal load range of 9 kW to 24.4 kW and a hydrogen blending ratio (by volume) range of 0 to 0.8. Based on this, a detailed analysis of how the flame structure evolves with the hydrogen blending ratio was conducted. The research findings reveal that under hydrogen-enriched conditions in the secondary stage fuel, the hydrogen blending ratio becomes the dominant factor governing the secondary flame morphology. The turbulent flame speed increases more significantly at lower hydrogen blending ratios, while this enhancement effect diminishes at higher ratios. Furthermore, flame pulsation is markedly suppressed as the hydrogen blending ratio increases.