Dolphins and other toothed cetaceans have high-speed swimming ability and are important research objects for underwater biomimetic drag reduction. In this paper, based on the characteristics of dolphin skin structure and adaptive deformation, an engineering-scale bionic study was carried out, a wall deformation motion control equation with the normal velocity of the boundary layer of the wall surface as the input signal was designed, and the drag reduction performance of the deformed wall surface was simulated by the dynamic mesh technology. The results show that the optimal frictional resistance reduction rate of the deformed wall surface is 19.24% and the optimal total resistance reduction rate is 6.4% at a flow rate of 0.5 to 10 m/s. Application of the biomimetic control results in the increase of the thickness of the turbulent boundary layer of the wall surface, reduction of both the surface friction resistance and the turbulence kinetic energy of the flow field. The bionic deformation wall was applied to the surface of the non-attached SUBOFF submarine model to carry out drag reduction design. In the speed range of 3.045-8.231 m/s, the total drag reduction rate greater than 8.0% was obtained.
| 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 |