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The soot volume fraction fv generation and distribution characteristics of high pressure direct injection natural gas were quantitatively studied on a constant volume combustion bomb under different fuel intake, oil/gas injection interval(STS) and ambient temperature using two-color laser induced incandescence(TC-LII) method. The results show that under the conditions of background pressure of 3MPa, ambient temperature of 800K, oil/gas injection pressure of 32MPa, 31MPa and injection interval of 0.4ms, the high concentration area of soot generated by trace diesel(8.104mg) ignition of high pressure direct injection natural gas(161.500mg) is mainly distributed on both sides of the middle axis of the jet flame. Increasing the amount of fuel increase the fv in the oil/gas coupled combustion flame, but the increase of diesel combustion intensity can accelerate the oxidation rate of soot in the natural gas jet flame at the later stage of combustion. When the injection pulse width of fuel is 1.1ms, the low concentration distribution interval of soot in the later stage of natural gas combustion is as high as 71%, and the soot discharged with the tail gas is the least. When STS=0.4ms, the peak values of maximum volume fraction(vmax) and average value(vmean) of volume fraction decreased by 27.2% and 28.1%, respectively, compared with STS=0.8ms, and those decreased by 9.3% and 6.6% compared with STS=1.2ms. The increase of ambient temperature lead to the increase of both vmax and vmean.
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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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