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Outline
Diesel density is an important parameter that must be set in design and simulation of a modern diesel engine fuel system. Diesel density varies greatly with temperature and pressure, and the accuracy of density is an important guarantee for the correctness of fuel system design and simulation. The wave velocity of national standard No.0 diesel under high temperature and high pressure was measured using a self-designed test platform of fuel pressure wave velocity, and the corresponding diesel density was derived and calculated. The law of variation of diesel density with temperature and pressure was obtained. The results show that the diesel density decreases with the increase of temperature and increases with the increase of pressure, and the influence of pressure on diesel density is much greater than that of temperature. Every increase of 10K in the temperature of 300—360K, the average density decreases by 0.004043—0.006038g/mL, and the higher the pressure, the smaller the density decreases with temperature. In the pressure of 20—200MPa, the density increases by 0.003844—0.004509g/mL on average with every increase of 10MPa. The higher the temperature, the greater the density increases with the pressure.
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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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