Combustion and ultrafine particle emissions of biodiesel engine(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年05期
- Page:
- 249-256
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Combustion and ultrafine particle emissions of biodiesel engine
- Author(s):
- FANG Wen1; 2; SU Xin1; MA Wenxiao1; XU Menglong1; LI Haige1; 3; HUA Haining1
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- Keywords:
- automotive engineering; biodiesel; common rail; combustion characteristics; ultrafine particle
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the ultrafine particle emission of diesel engine fueled with biodiesel, experiments were performed on a high pressure common rail diesel engine. A dynamic combustion test system including incylinder pressure sensor, charge amplifier, and combustion analyzer was used to measure the incylinder pressure. Subsequently, the instantaneous heat release ratio was calculated. SMPS3936 particle size spectrometer was used to measure the concentrations of ultrafine particles and diameter distribution. The results show that the peak combustion pressure of biodiesel is almost identical to that of diesel, and the peak heat release rate increases owing to the double injection when the mean effective pressure pme≤0.48 MPa at 1 400 r/min. The peak combustion pressure and peak heat release rate of biodiesel decrease when pme>0.48 MPa at 1 400 r/min. In the whole load range, the rapid combustion phase of biodiesel is nearly identical or only slightly more prolonged. However, the later combustion phase decreases in a pronounced manner, and consequently, the combustion duration of biodiesel decreases markedly, resulting in a concentrated heat release. The effective thermal efficiency of biodiesel decreases when pme<0.48 MPa, although it increases when pme＞0.48 MPa, and the increment improves with the engine load. The number concentration of biodiesel ultrafine particles is slightly higher than that of diesel when pme=0.16 MPa at 1 400 r/min, and it is distinctly lower when pme≥0.32 MPa. In the complete load range, the median diameter, mean diameter, and geometric mean diameter of biodiesel decrease significantly. Biodiesel application greatly helps in reducing the ultrafine particle emission of diesel engines. 5 tabs, 6 figs, 21 refs.
Last Update: 2018-10-23