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Outline
Based on the characteristics of the damage on the ship caused by the torpedo, the numerical model of multi-medium underwater explosions was established, where the methods of treating interface and calculating generalized smooth length were presented. According to this new model, the programs of multi-medium underwater explosions were worked out, and a quantitative analysis was made on the performance of the underwater air buffer weakening shock wave. The results show that the shock wave can be significantly attenuated by the air buffer, whether in contact explosions or non-contact explosions. And the attenuation effect of the air buffer in contact explosions is better than that in non-contact explosions. The pressure peak of the shock wave can be decreased by nearly 55% by the air buffer in contact explosions. When the ratio between the thickness of the air buffer and explosion equals 1, the effect of the air buffer on weakening shock wave is obvious, and further increasing the thickness of the air buffer has little influence on the attenuation effect. The research results will provide reference for the structure design of the ship protection system and torpedo defense cabin.
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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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