Numerical studies of the ignition characteristics of a high-pressure gas jet in compression-ignition engines with glow plug ignition assist: Part 1—Operating condition study
| Autor: | Kang Pan, James S. Wallace |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy Nuclear engineering Aerospace Engineering Ocean Engineering 02 engineering and technology 01 natural sciences 7. Clean energy Automotive engineering 010305 fluids & plasmas law.invention Physics::Plasma Physics Natural gas law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Physics::Chemical Physics Jet (fluid) business.industry Mechanical Engineering Ignition delay Compression (physics) Ignition system 13. Climate action Automotive Engineering Ignition timing Glow plug business |
| Zdroj: | International Journal of Engine Research. 18:1035-1054 |
| ISSN: | 2041-3149 1468-0874 |
| DOI: | 10.1177/1468087417699753 |
| Popis: | This article presents the results of computational studies investigating the ignition of high-pressure natural gas jets in a compression-ignition engine with glow plug ignition assist. The simulation was conducted using a KIVA-3V-based three-dimensional engine model, along with an improved fuel injector model, a detailed cut-off glow plug shield model and a modified two-step methane reaction mechanism, to simulate the natural gas injection and ignition. The simulated results demonstrate the significance of using a shield for the glow plug. Compared to an unshielded (bare) glow plug, the shield not only reduces the heat loss from the hot glow plug surface to the cold intake air charge and the cold injected gas jet but also traps the fuel mixture to increase its residence time adjacent to the hot surface. Over a representative range of heavy-duty diesel engine operating conditions, a shielded glow plug greatly improves the natural gas engine performance and provides reliable ignition, while an unshielded glow plug can only be optimized for specific conditions. The understanding of glow plug shield behavior gained from the simulations suggests avenues for improved shield designs that would yield further reduced ignition delays. |
| Databáze: | OpenAIRE |
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