Flame acceleration in unconfined lean hydrogen-oxygen mixtures using a hemispherical soap bubble method

Abstract

This study investigates the flame acceleration dynamics in lean hydrogen-oxygen mixtures, focusing on critical parameters such as Péclet number, Markstein number, and the acceleration exponent. Using a hemispherical soap bubble method, the research explores the onset of flame acceleration and its dependence on Darrieus–Landau and diffusive–thermal instabilities. The findings provide insights into the transition to self-similarity, fractal dimensions of the flame front, and the conditions influencing flame acceleration in hydrogen-oxygen mixtures. The results contribute to the fundamental understanding of hydrogen combustion dynamics, offering valuable data for the safe integration of hydrogen as a marine fuel. This research addresses key gaps in the literature and supports the development of safety standards for hydrogen-based energy systems in marine applications.