| Citation: | LUO Sixiao, CHEN Yuqian, MA Mingcheng, et al. Study on blending and combustion characteristics of hydrogen micro-mixing diffusion unit[J]. Journal of Aerospace Power, 2025, 40（11）：20250229 doi: 10.13224/j.cnki.jasp.20250229
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To enhance the combustion stability of hydrogen flames and reduce NOx emissions, investigation was carried out on a micro-mixing diffusion unit with hydrogen cross-injection. By means of numerical simulations for the cold and combustion states, the impacts of the length of micro-mixing section and the momentum flux ratio between fuel and air on mixing efficiency, flame morphology, and NOx emissions were analyzed. Furthermore, experimental measurements were conducted to evaluate the actual NOx emissions of the micro-mixing diffusion unit under varied operating conditions. Results indicated that three distinct combustion modes emerged: lifted flame, “W”-shaped flame, and droplet flame while the hydrogen penetration depths were changed. To achieve lower NOx emissions, the lifted flame required enhanced mixing for stable combustion. However, the excessive flame concentration should be avoided by appropriately reducing mixing for “W”-shaped and droplet flames because flame was adhered to the outlet of the micro-mixing unit. NOx emissions were relatively higher at equivalence ratios of 0.7 and 0.8 but decreased as air flow rate increased.
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