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Outline
The concentration distribution characteristics of ultra-high pressure natural gas jet were studied by laser induced fluorescence imaging method based on a high-pressure dual-fuel direct injection valve. The data processing method of natural gas jet concentration distribution was optimized by dividing the natural gas jet into shock core region, concentration rapid decline region, concentration mixing region and boundary diffusion region. The results show that the core region of shock wave is affected by the Mach disk, and the concentration peak appears at and is highly correlated with the location of the Mach disk. It is found in the study of the axial concentration of natural gas that the injection pressure has the greatest influence on the shock core region and the concentration rapid decline region near the nozzle. When the injection pressure is increased from 22MPa to 31MPa with a step of 3MPa, the length of the shock core region and the concentration rapid decline region increases by 60%, while the length of the concentration mixing region decreases by 2.2%. The boundary diffusion region is least affected, and the region length increases first and then decreases. The horizontal concentration study of natural gas also shows that the concentration of natural gas has a strong influence on the area near the nozzle. The axial concentration in the shock core region and the concentration rapid decline area increases with the increase of the injection pressure, while the concentration fluctuation area appears in the concentration mixing area and the boundary diffusion area far away from the nozzle.
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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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