Numerical analysis of methane slip source distribution in a four-stroke dual-fuel marine engine
| Autor: | Jesper Schramm, Rasmus Faurskov Cordtz, Michael Vincent Jensen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
Mechanical Engineering Numerical analysis 020101 civil engineering Ocean Engineering 02 engineering and technology Mechanics Four-stroke engine Marine engine Oceanography Combustion Methane 0201 civil engineering chemistry.chemical_compound chemistry Mechanics of Materials Natural gas Offshore geotechnical engineering Environmental science business Slip (vehicle dynamics) |
| Zdroj: | Journal of Marine Science and Technology. 26:606-617 |
| ISSN: | 1437-8213 0948-4280 |
| DOI: | 10.1007/s00773-020-00760-3 |
| Popis: | We present the results of a numerical model which has been developed for estimating the contribution to the methane slip from different sources in a four-stroke dual-fuel marine engine running on natural gas. The model is a thermodynamic three-zone zero-dimensional full engine cycle model and considers methane slip contributions from short-circuiting, crevices and wall quenching. The model is applied to analyze the methane slip from a four-stroke dual-fuel medium speed marine engine using natural gas as primary fuel. At low loads, wall quenching is found to be the dominant contribution to the methane slip. At full load, the wall quenching contribution is comparable to the level of the short-circuiting and crevice contributions which only vary relatively little with load. At 75% load, the contribution from short-circuiting is highest. In addition, we found that in-cylinder post-oxidation of unburned fuel remaining after the main combustion is negligible. |
| Databáze: | OpenAIRE |
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