Visualization of hydrogen jet evolution and combustion under simulated direct-injection compression-ignition engine conditions
| Autor: | Xinyu Liu, Evatt R. Hawkes, Ho Lung Yip, Aleš Srna, Sanghoon Kook, Qing Nian Chan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Jet (fluid)
Materials science Renewable Energy Sustainability and the Environment Diffusion flame Nozzle Energy Engineering and Power Technology 02 engineering and technology Injector Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion 01 natural sciences Schlieren imaging 0104 chemical sciences law.invention Physics::Fluid Dynamics Ignition system Fuel Technology Volume (thermodynamics) law Physics::Chemical Physics 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45:32562-32578 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.08.220 |
| Popis: | The evolution and combustion of H2 jets were investigated in an optically-accessible constant-volume chamber under simulated direct-injection (DI) compression-ignition (CI) engine conditions. The parameters varied include injection pressure (84–140 bar) and ambient temperature (1000–1140 K). A detailed characterization of the injector system and the ensuing jet penetration process is reported first. High-speed schlieren imaging, OH∗ chemiluminescence imaging and pressure trace measurements were subsequently used to investigate the auto-ignition and combustion of the H2 jets. The results show that the ignition delay of H2 jets under such conditions is sensitive to ambient temperature variations, but not to injection pressure. Optical imaging reveals that the combustion of H2 jets mostly initiated from a localized kernel, before spreading to engulf the whole jet volume downstream of ignition location. The imaging also indicates that after ignition, the flame recesses back towards the nozzle and appears to attach to the nozzle to form a diffusion flame structure. |
| Databáze: | OpenAIRE |
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