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| Simulation Study on Effects of Vultiple Injection Strategy on Combustion and Pollutant Emissions of N-Pentanol–Diesel Blended Fuel |
| DOI：10.13949/j.cnki.nrjgc.2022.03.012 |
| Key Words:internal combustion engine numerical simulation n-pentanol–diesel single injection multiple injection |
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| Abstract:In order to reveal the mechanism of the effects of coupling oxygenated fuel and injection strategy on engine combustion， performance and emission characteristics， the combustion and harmful emission generation processes of n-pentanol–diesel blended fuel under different injection strategies were studied based on the three-dimensional simulation software CONVERGE， coupled with chemical reaction kinetic mechanism. The results show that n-pentanol promotes the combustion process. When n-pentanol–diesel blended fuel was used， the maximum in-cylinder burst pressure， the peak heat release rate and the indicated mean effective pressure（IMEP） increase， while CO， total hydrocarbons（THC） and soot emissions decrease. But NOx emissions increase. In this study， a large proportional pre-injection strategy can promote the main injection combustion process， resulting in higher in-cylinder temperature and increased IMEP， but higher CO and THC emissions， while small pre-injection intervals lead to increased soot emissions. The post-injection strategy used in this study results in lower engine IMEP and lower NOx emissions. The soot emissions decrease significantly at small post-injection intervals， but increase significantly at large post-injection intervals. A three-injection strategy with large pre-injection intervals and small post-injection intervals for n-pentanol–diesel blends result in the highest IMEP and lowest harmful emissions. |
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