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Based on a modified diesel-methanol dual direct injection single-cylinder engine, combustion and emission characteristics of the diesel-ignited high-pressure direct injection methanol combustion were experimentally investigated and compared with those of the methanol-diesel dual-fuel combustion with premixed methanol across a wide indicated mean effective pressure(IMEP) load range of 0.4—1.4MPa. The results show that the diesel-ignited high-pressure direct injection methanol combustion can achieve stable combustion at 90%—97% methanol substitution rates over the broad load range. The methanol heat release stage exhibits significant diffusion combustion characteristic at medium to high loads, with the combustion duration during the post-combustion phase remaining nearly constant as load increases. Carbon monoxide and unburned hydrocarbon emissions are both below 1g/(kW·h) at all loads, while nitrogen oxide emissions significantly increase with increasing load. Compared with the methanol-diesel dual-fuel combustion with premixed methanol, the peak heat release rate of the diesel-ignited high-pressure direct injection methanol combustion is only half of that, allowing combustion to commence at earlier crank phases to get an increase of thermal efficiency by more than 4%. While soot, carbon monoxide, and unburned hydrocarbon emissions in all loads are substantially reduced to less than 10% of that, and NOx emissions are lower at low loads but higher at high loads.
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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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