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Taking an agricultural single cylinder diesel engine as the research object, the soot emission characteristics of biodiesel blended fuel were tested under the conditions of EGR rates of 0, 15% and 30% , and the influence of EGR rate on the combustion particle structure characteristics of biodiesel blended fuel was explored. The results indicate that biodiesel blended fuel can alleviate the problem of increased soot emissions caused by the introduction of EGR, and the improvement effect is more significant under high EGR rate conditions. The diesel engine exhaust particle size range is mainly between 20 nm and 80 nm, mainly showing normal distribution. Under the same EGR rate conditions, the particle size formed by burning biodiesel blended fuel significantly decreases, and the degree of agglomeration between particles increases, the porosity of particles increases, and the thickness of the interface layer increases. By adopting EGR technology, the average particle size of the particle group increases, the degree of agglomeration increases, the porosity of the particles decreases, and the thickness of the interface layer increases. Mixing biodiesel and introducing EGR can both increase the roughness and irregularity of the formed particles.
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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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