Researchers at ETH Zurich have conducted experiments to analyze the acoustic behavior of hydrogen injection nozzles, which are crucial for the development of clean hydrogen aircraft engines. The study, led by Professor Nicolas Noiray, highlights the challenges posed by hydrogen's faster combustion rate compared to kerosene, leading to more compact flames and potential vibration issues. The team's research focuses on preventing vibrations that could cause material fatigue and damage in hydrogen engines. By testing hydrogen injection nozzles in lab conditions mimicking cruising altitude, the researchers aim to understand and predict potential vibrations. This work is essential for ensuring the safety and efficiency of future hydrogen-powered aircraft. The study emphasizes the importance of optimizing the design of hydrogen engines to control the interaction between sound waves and flames, a critical aspect that engineers must address to prevent operational issues. The involvement in the EU project HYDEA further enhances the research efforts at ETH Zurich, allowing for comprehensive testing of hydrogen injection nozzles in collaboration with GE Aerospace. Overall, the advancements in understanding the acoustics of hydrogen flames and their interaction with combustion chambers mark a significant step forward in the development of hydrogen-powered engines for a cleaner and more sustainable aviation industry.