Full
Outline
The mine ventilation system is the important subsystem in the underground engineering of the mine. The accurate control of the air volume is the basis for the optimization of the ventilation system, and the local resistance is one of the important factors affecting the air volume. In order to study the local flow field characteristics of the double-frame louver windshield, the Computational Fluid Dynamics (CFD) numerical simulation software was used to analyze the dynamic characteristics of the local flow field of the louver windshield under different inlet wind speeds and different blade opening angles. The relationship functions between the effective opening area of the windshield with the air volume and local resistance were established and compared with the measured results. The results show that when the blade opening angle is 45°, a high-speed flow field is gradually formed at the inlet of the windshield. With the increase of the inlet wind speed, the peak wind speed and the flow field area increase. When the blade opening angle increases from 60° to 90°, the local resistance at the windshield decreases and the distribution characteristics of the rear flow field change. During the process of the wind flow passing through the windshield, the static pressure energy and kinetic energy are converted to each other. The pressurization deceleration area and the vortex area formed on the leeward side of the air door become the key factors affecting the local resistance and energy loss in the flow field behind the double-frame louver windshield. The local resistance coefficient of the windshield depends on the effective wind area, which has a power function relationship with the blade opening angle. The maximum relative error between the local resistance of the windshield calculated by the formula and the measured results is 5.57%, which shows that the local resistance calculated by the formula is more accurate.
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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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