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Based on a highpressure common rail diesel engine, a methanol injection system is installed at the intake manifold. A twostage direct injection (preinjection + main injection) of coaltoFischerTropsch (FT) diesel is installed in the cylinder. A twostage injection FT diesel/methanol (F/M) dualfuel engine test stand is built to explore the effect of different methanol substitution rates on engine emission performance at 2 000 r/min and loads of 25%, 50%, 75% and 100%. Simultaneously, the theoretical basis for realizing the FT diesel/methanol reactivity controlled compression ignition (RCCI) mode is explored. The results indicates that the fuel economy of the F/M dualfuel engine is better at medium and high loads. The emissions of HC, CO, Soot, methanol and formaldehyde increase in the F/M dualfuel combustion mode compared with the singlefuel compressionignition mode. These emissions increase with the augmentationmethanol substitution rate and decrease with an increase in load. In contrast, the emissions of CO2, NOx and NO decrease with an increase in methanol substitution rate but increase with an increase in load. The emissions of NO2 increase with both the rise in methanol substitution rate and load. The test results show that simply adding a methanol injection system to the intake manifold cannot achieve an efficient and lowemission RCCI combustion mode, and its fuel injection strategy needs to be calibrated.
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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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