Full
Outline
To mitigate cavitation issues in low‑lift submersible axial flow pumps during operation，a method inspired by the use of circumferential groove casing treatment for stability enhancement in compressors was proposed. This approach involved applying circumferential groove casing treatment to axial flow pumps. Seven different casing treatment schemes were designed，and their effects on the cavitation performance of the pump were investigated through steady-state numerical simulations using the SST k-ω turbulence model and the Zwart-Gerber-Belamri cavitation model. The study focused on three key parameters：the installation position，width，and depth of the circumferential grooves.The results indicate that cavitation is primarily caused by low‑pressure regions formed by the leakage flow at the blade tip.After installing the circumferential grooves，the pump head experienced some loss，with the installation position of the grooves having the most significant impact on cavitation performance. Compared to a smooth wall casing，cavitation occurred earlier when the groove is positioned at 10% of the axial chord length，while the best anti‑cavitation performance is achieved when the groove is located at 45% of the leading edge of the axial chord length at the blade tip，reducing the required net positive suction head （NPSH） by 2.9%. Among three groups of grooves with different widths，it was found that as the groove width increased，the pump's anti‑cavitation performance improved，with the maximum NPSH reduction reaching 4.01%，although this also led to increased head loss.Additionally，three grooves with different heights all resulted in a 2.9% reduction in NPSH，indicating that groove height has a relatively minor impact on cavitation performance. The findings of this study provide a theoretical basis for suppressing cavitation in water 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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