Numerical simulation study of hydrogen/air flame propagation and detonation characteristics in an annular cross section of gas turbine combustion chamber.

This article focuses on the numerical simulation analysis of hydrogen flame propagation and detonation characteristics within the annular channel of a hydrogen combustion chamber commonly used in gas turbines. It examines how flame behavior, peak pressure distribution, and wall impact vary under different operating conditions, including changes in temperature, pressure, and equivalence ratio of the hydrogen/air mixture. The study finds that flame propagation is influenced by the channel walls, leading to faster circumferential than radial spread, which promotes detonation; higher temperatures accelerate combustion and favor earlier detonation at lower pressures with reduced impact strength, while lower temperatures slow combustion and reduce detonation likelihood. Additionally, increasing the compression ratio raises the affected high-pressure area but does not significantly intensify peak detonation pressures, providing insights relevant to the structural design and safety management of hydrogen-fueled aero-engine combustion chambers.