This study investigates the interaction between thermoacoustic instabilities and autoignition kernel formation in Constant Pressure Sequential Combustors (CPSCs) fueled by both a methane–hydrogen blend and pure hydrogen. The research highlights how increasing the thermal power leads to distinct instability patterns in each fuel configuration, with noticeable differences in acoustic pressure spectra and chemiluminescence during instability. The findings underline the challenges of achieving stable autoignition in 100% hydrogen-operated sequential combustors, which is crucial for decarbonization efforts.

The research utilized the CERCO 45 mm UV lens (F/1.8), essential for capturing high-speed OH* chemiluminescence, which provides key insights into the combustion process. This lens, paired with a band-pass filter and a high-speed camera, allowed for detailed observation at frame rates up to 5 kHz. Such precision in capturing data was critical in developing novel Low-Order Models that replicate experimental findings. For more information, you can read the full article and explore the Cercolens 45 mm product page.

Impagnatiello, M., Shcherbanev, S., Dharmaputra, B., & Noiray, N. (2025). Nonlinear dynamics and thermoacoustic intermittency of a hydrogen-powered sequential combustor. Combustion and Flame, 274, 114008.