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Outline
Based on a self-built optically visualized constant volume combustion chamber system, the effects of injection duration(3.0, 6.0, 8.6ms), injection pressure(30, 40, 50MPa), and ambient temperature(880, 910, 940K) on n-butanol spray flame were studied. The flame development process and combustion characteristics were revealed by flame self-illumination high-speed imaging method. Results show that the n-butanol spray flame shows a yellow-white flame as a whole, and there is a small amount of light blue flame upstream of the spray. Under small injection duration(3.0ms), a partial flame-quenching phenomenon presents after n-butanol ignites. As injection duration increases, the soot lift-off length shortens, and the flame brightness, ignition delay and combustion duration increase. As injection pressure increases, the flame brightness and flame backtracking phenomenon weaken, and the soot lift-off length increases. At the same time, the ignition delay is prolonged, but the combustion duration is shortened. The ambient temperature has a significant effect on the stable ignition of n-butanol spray flame. With an increase in ambient temperature of only 60K, the ignition delay of n-butanol spray flame is notably shortened by 4.16ms, while the flame brightness is obviously enhanced and the flame shape is more stable.
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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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