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In order to study the shell fragmentation and the early motion of extinguishing medium after explosion in the cold shock-wave extinguishing system, the pressure on the inner wall of the cold shock-wave extinguishing bomb must be firstly understood. The change of pressure has been studied by dimensional analysis, mechanical structure, and explosion experiments. It is found that the pressure is related to the charge weight and bomb diameter, and the pressure waveform measured at the inner wall is rectangular. When the bomb diameter is 104 mm, the duration of high pressure is above 100 μs; when the bomb diameter is 220 mm, the duration of high pressure is above 200 μs. In addition, the specific central explosive charge of powder is more than that of water under the same dimension of the cold shock-wave extinguishing bomb to reach better effect of the shell crushing. Owing to the higher energy dissipation during compression, the finer powder and pre-compression powder are suggested as extinguishing medium in powder cold shock-wave extinguishing system.
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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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