Full
Outline
The impact of pre-chamber injection timing and spray angle on combustion and emissions of a WP10H heavy-duty diesel engine was investigated using the numerical simulation software CONVERGE. The results show that under high-load conditions, pre-chamber combustion system improves combustion efficiency, advances the combustion phase, increases the peak cylinder pressure, shortens the combustion duration, and leads to an elevated wall heat transfer loss. Some pre-chamber setups studied effectively reduces both NOx and soot emissions. The optimized pre-chamber configurations demonstrates that sustained turbulence induced by the pre-chamber disrupts the redistribution of unburnt mixture in the main chamber, decreasing the presence of dilute mixtures in the cylinder and subsequently lowering NOx emissions. Additionally, with an equivalence ratio near 1, the increased mixture facilitates more comprehensive combustion, resulting in higher temperature in the main chamber during the soot oxidation stage and aiding in soot reduction. The final optimized solution involves selecting a pre-chamber injection timing of 0° CA ATDC and a pre-chamber injection angle of 54.5°. This configuration, compared to the baseline engine, results in a 2.48% reduction in NOx emissions and a 21.07% reduction in soot emission.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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