Details

Autor(en) / Beteiligte

• Zhang, Chunhua
• Li, Yangyang
• Liu, Zhentao
• Liu, Jinlong

Titel

An investigation of the effect of plateau environment on the soot generation and oxidation in diesel engines

Ist Teil von

• Energy (Oxford), 2022-08, Vol.253, p.124086, Article 124086

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The plateau environment deteriorates the combustion quality inside the heavy duty diesel engine, bringing difficulties in controlling soot emissions. To study the causes of soot increase is the basis for optimizing highland engines and achieving clean operation. A multidimensional CFD model based on a 6V150 engine was developed in this study to investigate the effect of altitude on soot formation and oxidation processes. The comparison between experimental data and numerical results showed that the model was deemed to be able to predict in-cylinder activities at various altitudes. The simulation results showed that when the diesel engine was operated at high altitude, the mismatch between fuel and air led to more soot formation but less oxidized. The wall impingement of fuel droplets occurred at altitudes above 3000 m and soot emissions rose sharply when the altitude exceeded 4000 m. It can be concluded that the engine recalibration strategy may mitigate the increase in soot at altitudes below 3000 m, but may not be very effective when the engine is operating at 4000 m. In addition, the application of oxygenated fuels that can provide more hydroxyl radicals may be an alternative solution to mitigate soot emissions from diesel engines operating in very high altitude regions. •The CFD model effectively reproduced the increased soot phenomenon in highland engines.•Soot emission significantly increased with altitude above 4000 m.•Liquid films were formed at altitudes over 3000 m due to the low density of cylinder gas.•Highland environment squeezed the spray development and weakened air entrainment.•High altitude operation hindered the oxidation process of soot by OH radicals.