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    • Influence of Pressure and Mixture Composition on Ignition Kernel Properties in Inert and Reactive Configuration

    A. Matino,J. Sotton,M. Bellenoue,C. Viguier,S. Richard

    AIAA SCITECH 2024 FORUM（2024）

    Safran Helicopter Engines | Combust Dept

    Cited 0|Views4
    Abstract
    The impact of initial pressure and mixture composition was investigated in this study to observe their influence on kernel properties during energy depositing using a sunken fire igniter. Experiments were conducted in a cylindrical combustion chamber using high-speed Schlieren and direct visualizations. Comparison with reference tests performed in pure nitrogen highlighted the influence of composition variation on kernel volume and surface at the end of energy depositing (t = 130 µs). The effect of equivalence ratio was observed to be enhanced by lower pressure conditions. A dominant effect of pressure confirms results from previous studies. Filtered plasma chemiluminescence performed through direct visualization showed a negligible effect of composition and pressure during the first instants of kernel generation (~ 30 µs). Timing of intervening chemical reactions is traced comparing inert and reactive tests. This was done using two approaches. Specifically, the aim was to identify these variations and determine their occurrence in relation to the duration of energy depositing. It was observed that these start appearing already during energy depositing.
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    【要点】：本文研究了初始压力和混合物组成对能量沉积过程中点火核特性的影响，发现压力和混合比显著影响点火核体积和表面特性，且压力对等效比的影响在低压条件下更为显著。
    

    【方法】：通过在圆柱形燃烧室内使用高速Schlieren和直接可视化技术进行实验，并与纯氮环境中的参考测试进行比较。
    

    【实验】：实验在圆柱形燃烧室内进行，使用高速Schlieren和直接可视化技术记录了点火核在能量沉积结束时刻（t = 130 µs）的体积和表面特性，发现混合物组成和压力对点火核特性的影响。通过两种方法追踪了干预化学反应的时间，并与惰性和反应性测试进行比较，结果表明这些变化在能量沉积期间已经开始出现。数据集名称未在文中提及。