Suitability of helium gas as surrogate fuel for hydrogen in H2-Air non-reactive supersonic mixing studies

Oamjee, Aryadutt; Sadanandan, Rajesh

doi:10.1016/j.ijhydene.2022.01.022

International Journal of Hydrogen Energy

2022

DOI: 10.1016/j.ijhydene.2022.01.022

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Suitability of helium gas as surrogate fuel for hydrogen in H2-Air non-reactive supersonic mixing studies

Aryadutt Oamjee

Rajesh Sadanandan

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2024

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Gas jet structure effects on fuel concentrations and flames in a hydrogen low-pressure direct-injection spark-ignition engine

Kim,

Zhang,

Kim

et al. 2024

International Journal of Engine Research

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This study aims to find the impact of the nozzle shape of a side-mounted, 3.5-MPa pintle injector on hydrogen concentration and flame development in a low-pressure direct-injection spark ignition (H2LPDI) engine. To this end, endoscopic high-speed imaging of gas jet laser shadowgraph and flames as well as spark-induced breakdown-spectroscopy (SIBS) method are applied to one of the inline four cylinders of H2LPDI engine. Two engines with endoscopic access are used: one motored engine for high-speed laser shadowgraph imaging of gas jet development and the other combustion engine for SIBS-based spark gap [Formula: see text] measurements and high-speed hydrogen flame imaging. The gas jet visualisation showed that a nozzle with a narrower jet spreading angle leads to more turbulent jet boundaries and the jet axis being directed more towards the piston. Due to higher axial momentum, the narrower spreading angle nozzle also caused enhanced jet penetration across the in-cylinder tumble flow. This jet development pattern resulted in locally leaner hydrogen mixtures near the centrally mounted spark plug at the time of ignition, evidenced by a higher difference between spark gap λ and global λ. As a result, the flame size was measured smaller at any fixed combustion stage. For both nozzle types, the injection timing was also varied between 150 and 120 °CA bTDC but there was no significant difference measured in spark gap [Formula: see text] and flame size compared to that associated with the nozzle type.

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Gas jet structure effects on fuel concentrations and flames in a hydrogen low-pressure direct-injection spark-ignition engine

Kim,

Zhang,

Kim

et al. 2024

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

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Suitability of helium gas as surrogate fuel for hydrogen in H2-Air non-reactive supersonic mixing studies

Cited by 1 publication

References 55 publications

Gas jet structure effects on fuel concentrations and flames in a hydrogen low-pressure direct-injection spark-ignition engine

Gas jet structure effects on fuel concentrations and flames in a hydrogen low-pressure direct-injection spark-ignition engine

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