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Marine risers are critical facilities connecting offshore oil and gas platforms to subsea wellheads, and vortex-induced vibration is the main cause of fatigue damage to risers. Therefore, a vibration suppression-energy harvesting turbine device was designed for risers to suppress vortex-induced vibration and harvest energy. Then experiments were conducted with the length of the blade of the turbine device’s impeller as a variable. On one hand, the vibration suppression and energy harvesting performance of the turbine device were verified; on the other hand, the influence of the impeller’s length of the blade on the device’s vibration suppression-energy harvesting performance was investigated. The results show that the overall vibration suppression efficiency of the turbine device is ideal, capable of reaching over 50%, with the best vibration suppression efficiency being 96.08%. The vibration suppression performance of the device increases positively with the increase in the impeller’s length of the blade, while the energy harvesting performance shows a negative trend. When the length of the blade is 12d, the vibration suppression-energy harvesting performance of the device increases synchronously with the increase in the incoming flow velocity.
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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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