Akademik Veri Yönetim Sistemi
5 thInternational Congress of Engineering and Natural Sciences- ICENSS, Ankara, Türkiye, 24 - 25 Mayıs 2025, ss.643-652, (Tam Metin Bildiri)
In the ongoing global effort to find viable alternatives to fossil fuels, hydrogen stands out as a promising option due to its potential for zero carbon emissions. Nevertheless, hydrogen's unique physical characteristics result in notable deviations in in-cylinder injection dynamics and mixture formation compared to traditional fuels. This study explores how variations in injector tip geometry affect the spray behavior of hydrogen injected into a cylindrical chamber, operating under constant injection pressure and a time-dependent mass flow rate. The research is conducted without accounting for combustion processes and focuses on key spray metrics such as jet penetration length, spray cone angle, and the spatial distribution of hydrogen within the domain. Numerical simulations were carried out using CONVERGE CFD software, and the resulting flow fields and scalar distributions were postprocessed with Tecplot 360 EX. The results demonstrate that injector tip design has a substantial influence on spray development. Specific geometric features, including tip caps, poppet valves, pintle protrusion, and tip curvature, significantly affect spray patterns and mixture uniformity under varying pressure conditions. These insights offer valuable guidance for the design and optimization of hydrogen injectors and spray strategies in hydrogen-fueled internal combustion engines.This work has been supported by Yıldız Technical University Scientific Research Projects Coordination Unit under project number FYL-2024-6336.