Visualization of hydrogen jet evolution and combustion under simulated direct-injection compression-ignition engine conditions |
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| Affiliation: | 1. Heat Power Engineering Laboratory, Graduate School of Natural Science and Technology, Okayama University, Tsushima-Naka 3-1-1, Kita-Ku, Okayama 700-8530, Japan;2. School of Mechatronic Engineering, Universiti Malaysia Perlis, Ulu Pauh 02600, Perlis, Malaysia;1. Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada;2. Faculty of Mechanical Engineering, Semnan University, Semnan, Iran;3. Fuel and Combustion Development Department, Irankhodro Powertrain Co., Tehran, Iran;4. Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran;1. School of Power and Energy Engineering, Harbin Engineering University, Harbin 15000, China;2. College of Power Engineering, Bauman Moscow State Technical University, Moscow 115569, Russia;1. University of Rome Tor Vergata, Italy;2. Argonne National Laboratory, United States;1. School of Automotive Studies, Tongji University, Shanghai 200092, China;2. Chinesisch Deutsches Hochschul Kolleg, Tongji University, Shanghai 200092, China |
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| Abstract: | 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, OH1 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. |
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| Keywords: | Hydrogen auto-ignition High-pressure gas jet Hydrogen engine Hydrogen direct injection |
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