Full
Outline
In order to quantitatively explore the influence of cyclic oil injection quantity on the heat transfer performance of screw air compressors，experiments were conducted to study the effects of changing oil injection quantity and suction temperature on exhaust temperature，overall temperature difference，inlet and outlet oil temperature of oil coolers，logarithmic mean temperature difference and convective heat transfer coefficient under different operating conditions.At the same time，the curve of convective heat transfer coefficient and oil injection quantity was fitted using experimental data.The results show that the oil injection quantity and input power should be accurately matched under the rated exhaust pressure at full load.When the oil injection quantity decreases from 262 L/min to 134 L/min，the convective heat transfer coefficient of the oil cooler to decreases by 12.4%，the temperature difference of the lubricating oil will increase from 16.0 ℃ to 29.8 ℃，resulting in an 8.3% decrease in the logarithmic mean temperature difference of convective heat transfer under the original calculation conditions，increasing exhaust temperature.The research can provide theoretical guidance for solving the problem of high exhaust temperature in screw air compressor.
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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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