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Outline
Thermal conductivity characteristics of the diesel particulate filter(DPF) substrate significantly impact the parking regeneration of diesel engines under plateau conditions. The heat transfer patterns within DPF/catalyzed diesel particulate filter(CDPF) with two substrates with different thermal conductivity characteristics were investigated under steady flow fields，and the effect of thermal conductivity characteristics on bed temperature variations and regeneration efficiency during the parking regeneration was examined. Results show that as the DPF inlet temperature uniformly increases，bed temperatures at all positions rise linearly at faster rates in substrates with higher thermal conductivity. Substrates with higher conductivity exhibit a higher temperature rise rate. During parking regeneration，substrates with higher thermal conductivity exhibit greater regeneration efficiency in DPF and CDPF. Extending regeneration duration gives more regeneration efficiency improvement. Effective active coatings can substantially mitigate the decease in regeneration efficiency caused by substrate thermal conductivity differences in the plateau environments. When the optimized high-conductivity substrate is used with a carbon load of 6g/L and an inlet temperature of 580℃，the CDPF achieves a regeneration efficiency of 95.4% after a 1800s of parking regeneration，meeting the plateau regeneration requirements.
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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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