Dr Mohammed Mahmoud Youssif

Citation:

[Anonymous] (2025).  Impact of jet ignition strategy on flame kernel development and combustion dynamics in hydrogen-powered engines. 186, 150932. copy at www.tinyurl.com/24hgrk4r

Date Published:

Abstract:

Amid global energy and environmental challenges, hydrogen-powered internal combustion engines (HICEs) have emerged as a promising solution due to their potential for clean emissions. However, significant challenges, such as combustion instability and low power density under ultra-lean conditions, persist. This study investigates turbulent jet ignition (TJI) systems in HICEs, focusing on how the start of injection (SOI) and duration of injection (DOI) influence hydrogen distribution, flow characteristics, and combustion efficiency. Four computational models were implemented to quantify these relationships and optimize flame kernel development and overall combustion performance. A specially designed engine configuration was developed to validate the numerical outcomes. The results show that early injection (90°CA BTDC) leads to hydrogen loss, while late injection (30°CA BTDC) delays flame kernel formation due to increased ignition energy dissipation caused by high-speed flow. An optimal SOI between 50°CA and 70°CA BTDC improves mixture concentration, shortens ignition delay, and enhances thermal efficiency to 47 %. Increasing the DOI to 2°CA–3°CA stabilizes flame kernel initiation and accelerates flame propagation in the main chamber. However, high-speed flow around the spark plug can impede flame kernel development and reduce combustion efficiency. This study highlights the importance of synergistic optimization of pre-chamber injection strategies and structural design, offering valuable insights into achieving efficient and clean combustion in HICEs.

Notes:

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