Full
Outline
In order to explore the change of propulsion performance of propeller after biological fouling, the full-scale KP505 propeller was taken as the research object. The geometric modeling of fouling was carried out according to the fouling attachment law on the propeller surface, and then the numerical simulation of full-scale propeller under smooth and different fouling attachment conditions was carried out based on viscous fluids Computational Fluid Dynamics (CFD) method and roughness function model. The results show that the attached biofouling has a greater effect on the open water performance. Specially different fouling conditions lead to a reduction in propeller thrust, an increase in torque, a reduction in propulsion efficiency, a reduction in the strength of the wake vortex and the faster dissipation. The more severe the foulings is, the more obvious the change is. Although fouling can increase the loss of flow field energy and cause many adverse effects, fouling can shorten the wake length of the flow field behind the propeller, thereby mitigating its disturbance on the far-field flow.
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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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