Full
Outline
To investigate the drag reduction mechanism of a biomimetic fish scale centrifugal pump，the response surface methodology was employed to optimize the structural parameters of biomimetic fish scale pits，and the values of each structural parameter corresponding to the optimal drag reduction effect were determined.The study revealed that under different operating conditions，the biomimetic fish scale pit structure can enhance the hydraulic performance of centrifugal pumps，with the most significant improvement observed under the rated operating condition.Compared to the baseline pump，the head and efficiency increased by 0.88 m and 3.71 percentage points，respectively，with an efficiency gain rate of 5.13% and a drag reduction rate of 4.30%.On one hand，the biomimetic fish scale pits expand the contact area between the blade working surface and the internal fluid，thereby improving the shear stress distribution on the blade wall.On the other hand，they thicken the near‑wall boundary layer and reduce the Reynolds stress in the near‑wall region of the blade.Furthermore，the biomimetic fish scale pits can disrupt the vortex structure on the blade surface，reduce the vortex core inside the centrifugal pump and the vortex area at the blade outlet，and weaken the intensity of energy exchange and conversion.This delays boundary layer separation，inhibits the transition from laminar to turbulent flow during fluid movement，and makes the internal flow more uniform，ultimately reducing the resistance encountered by the centrifugal pump during operation.This research can provide a reference for the optimal design of centrifugal pumps.
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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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