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In this paper, numerical simulation of projectile’s underwater motion process with tail-slaps was studied based on CEL (coupled Eulerian-Lagrangian analysis) method. The stability principle of projectile’s motion with tail-slaps was studied. Some parameters, such as initial angle of attack when tail-slaps occurred, maximum angle of attack, and instability critical angle of attack were used to characterize the projectile’s tail-slap. The relationship between stability and angle of attack was revealed. The location change of pressure center caused by projectile’s tail-slap was studied, too. The results showed that the static stability margin of projectile was enough to meet its stability requirements. Finally, three constraint criteria for the motion stability of projectile, including the requirement for the size of cavity, the relative location of center of pressure and center of mass, and the static stability margin of projectile, were obtained. The location and area of tail-slap can be used to control the static stability margin of projectile, some suggestions for the design of projectile’s shape were proposed, too.
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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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