The effect of pressure on hydrogen (H 2 ) enriched natural gas jet flames in crossflow is experimentally investigated here. Simultaneously acquired high speed OH* chemiluminescence, OH planar laser induced fluorescence (PLIF), and stereoscopic particle image velocimetry are used to study flames at conditions typical of a gas turbine premixer, i.e. at elevated pressure, preheated crossflow, and in confinement. Two different H 2 enrichment levels (40% and 20%, by volume) and pressures (10 bar and 15 bar) were studied here. Flames at the higher H 2 enrichment level were found to be stabilized on the windward side, while the flames at the lower H 2 enrichment were found to be stabilized only on the leeward side. Increased H 2 enrichment was also associated with greater sootiness in the measured region. Jet centerline trajectories showed greater penetration for the higher H 2 enrichment flames, which is in agreement with existing theories on the effect of heat release from a flame on crossflow entrainment. There were no significant changes observed in the mean OH* chemiluminescence, OH-PLIF, velocity fields, and velocity fluctuation fields with changes in pressure.

中文翻译：

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压力对横流中富氢天然气射流火焰的影响

这里通过实验研究了压力对横流中富含氢气 (H 2 ) 的天然气射流火焰的影响。同时获得的高速 OH* 化学发光、OH 平面激光诱导荧光 (PLIF) 和立体粒子图像测速法用于研究燃气轮机预混器典型条件下的火焰，即在高压、预热横流和限制条件下。这里研究了两种不同的 H 2 富集水平（40% 和 20%，按体积计）和压力（10 bar 和 15 bar）。发现 H 2 浓度较高的火焰在迎风侧稳定，而 H 2 浓度较低的火焰仅在背风侧稳定。增加的 H 2 富集也与测量区域中更大的烟灰有关。射流中心线轨迹显示出更高 H 2 富集火焰的更大穿透力，这与关于火焰放热对横流夹带影响的现有理论一致。在平均 OH* 化学发光、OH-PLIF、速度场和速度波动场中没有观察到随压力变化的显着变化。