Session: 04-43 Hydrogen Emissions III

Submission Number: 178328

Experimental Study on Hydrogen Combustion Instability in Mesoscale Premixed Arrayed Tubes Combustor 

Hydrogen, as a clean and efficient energy carrier, holds significant promise for applications such as gas turbines. However, its premixed combustion is highly susceptible to combustion instability, which poses a major challenge for practical implementation. Currently, research on hydrogen combustion instability within mesoscale arrayed microtube combustors remains notably limited. To address this knowledge gap, a novel seven-tube array hydrogen premixed burner was designed for this investigation. Systematic experiments were conducted to examine the influence of the equivalence ratio (φ = 0.3–0.8) on combustion instability under turbulent premixed conditions. The results indicate that the system remains stable for equivalence ratios below 0.65, with the flame exhibiting either a lifted or a steadily anchored conical shape. A significant transition occurs at an equivalence ratio of 0.66, where combustion instabilities are triggered. These instabilities are characterized by axial acoustic modes oscillating at the fundamental, second, and third harmonic frequencies. The pressure oscillation amplitude peaks at φ = 0.70 before gradually decaying. The frequencies of these acoustic modes demonstrate a linear increase with the equivalence ratio, with the fluctuation energy predominantly concentrated in the first two dominant modes. Synchronized with these pressure oscillations, the flame structure exhibits a periodic cycle of lift-off and reattachment, visually confirming a strong thermoacoustic coupling. This work elucidates the underlying instability mechanisms in a mesoscale hydrogen premixed combustor, highlighting the critical role of flame-acoustic interaction. The findings provide a crucial experimental basis and quantitative insights for the stable design and operational control of future hydrogen-fueled micro-combustion systems.

Presenting Author: Yuchen Wang Beihang University

Presenting Author Biography: Doctor of Aero Engine Research Institute of Beihang University

Authors:

Yuchen Wang Beihang University
Yunxin Chang Beihang University
Ziyu Qin Beihang University
Wenbin Feng Beihang University
Wei Xu AECC Gas Turbine Co.,Ltd
Min Wang AECC Gas Turbine Co.,Ltd
Xiao Han Beihang University