To improve the efficiency of hydrogen-fueled engines, this study visualizes the behavior of hydrogen jets in the intake port and evaluates their mixing characteristics. Experiments were conducted using a specially designed apparatus simulating an intake port, equipped with a quartz glass window for optical access. The temporal evolution of the fuel–air mixture was observed using laser-induced fluorescence (LIF), with acetone employed as a tracer. The mixing process induced by hydrogen injection was captured over a distance of approximately 400 mm from the injection point, with high temporal resolution at 0.5 ms intervals, covering up to 30 ms after injection. Furthermore, image analysis using Python enabled estimation of the jet behavior and quantitative evaluation of the mixture distribution. These results provide fundamental insights into optimizing mixture formation in hydrogen combustion engines.
Shimizu et al. (Wed,) studied this question.