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Outline
The pulse-jet air-assisted atomization nozzle has the advantages of good atomization characteristics and minimal influence of fuel physical properties on atomization performance，and therefore has good application prospects in ignited aviation heavy fuel engines. In order to investigate the atomization characteristics of multi-fuel used on the pulse-jet air-assisted nozzle，four pure alkanes of n-octane，n-decane，n-dodecane and n-tetradecane were selected to conduct comparative experiments. A phase Doppler particle analyzer(PDPA) technology was used to measure the particle size and axial velocity of spray droplets under the fuel injection pressure of 1.0MPa，the air injection pressure of 0.8MPa and the backpressure equivalent to standard atmospheric pressure. More attention was paid to the processes of the micro-atomization characteristics of different fuel jets from near-field to far-field. It is found that although the atomization performance of the four types of fuel droplets varies due to differences in physical properties，the Sauter mean diameter(SMD) at all sampling points remains below 20µm. With the development of the jets，it exhibits a non-monotonic characteristic of first breaking and then coalescing，and the axial average velocity shows a monotonic increase. Further analysis reveals that the physical mechanism of droplets behind this phenomenon is the interaction between two competitions：Separation-coalescence and coalescence-bouncing-evaporation.
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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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