Experimental study of hydrogen jet dynamics: Investigating free momentum and impingement phenomena

Yeganeh, Maryam; Akram, Muhammad Saad; Cheng, Qiang; Karimkashi, Shervin; Kaario, Ossi; Larmi, Martti

doi:10.1016/j.ijhydene.2024.04.296

Cited by 2 publications

(2 citation statements)

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“…These findings underscore the intricate relationship between temperature, injection pressure, and jet characteristics within the experimental chamber. In accordance with the observations made, a recent study by Yeganeh et al [31] reached similar conclusions regarding the relationship between pressure ratios, spray penetration, and cross-sectional area. However, it is important to note that the relationships between the injection and chamber pressures studied are different due to the characteristics of the injector used in this study.…”

Section: Effects Of Injection Pressuresupporting

confidence: 89%

“…The results are presented in the same manner and order as in the previous sections. As can be observed in Figure 12, the jet penetration was hardly affected by the applied T inj ; a similar phenomenon was observed in a recent study conducted by Yeganeh et al [31], in which the injection duration using a low-pressure direct-injection hydrogen injector had a negligible effect on the spray properties. When examining the calculated volume, a difference could be inferred between a short injection energizing time, such as 2500 µs, and the rest.…”

Section: Effects Of Injection Timingsupporting

confidence: 85%

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Spray Characterization of Direct Hydrogen Injection as a Green Fuel with Lower Emissions

Payri,

Novella,

Nasser

et al. 2024

Energies

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A viable green energy source for heavy industries and transportation is hydrogen. The internal combustion engine (ICE), when powered by hydrogen, offers an economical and adaptable way to quickly decarbonize the transportation industry. In general, two techniques are used to inject hydrogen into the ICE combustion chamber: port injection and direct injection. The present work examined direct injection technology, highlighting the need to understand and manage hydrogen mixing within an ICE’s combustion chamber. Before combusting hydrogen, it is critical to study its propagation and mixture behavior just immediately before burning. For this purpose, the DI-CHG.2 direct injector model by BorgWarner was used. This injector operated at 35 barG and 20 barG as maximum and minimum upstream pressures, respectively; a 5.8 g/s flow rate; and a maximum tip nozzle temperature of 250 °C. Experiments were performed using a high-pressure and high-temperature visualization vessel available at our facility. The combustion mixture prior to burning (spray) was visually controlled by the single-pass high-speed Schlieren technique. Images were used to study the spray penetration (S) and spray volume (V). Several parameters were considered to perform the experiments, such as the injection pressure (Pinj), chamber temperature (Tch), and the injection energizing time (Tinj). With pressure ratio and injection time being the parameters commonly used in jet characterization, the addition of temperature formed a more comprehensive group of parameters that should generally aid in the characterization of this type of gas jets as well as the understanding of the combined effect of the rate of injection on the overall outcome. It was observed that the increase in injection pressure (Pinj) increased the spray penetration depth and its calculated volume, as well as the amount of mass injected inside the chamber according to the ROI results; furthermore, it was also observed that with a pressure difference of 20 bar (the minimum required for the proper functioning of the injector used), cyclic variability increased. The variation in temperature inside the chamber had less of an impact on the spray shape and its penetration; instead, it determined the velocity at which the spray reached its maximum length. In addition, the injection energizing time had no effect on the spray penetration.

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Section: Effects Of Injection Pressuresupporting

confidence: 89%

Section: Effects Of Injection Timingsupporting

confidence: 85%