Full
Outline
In order to enhance the gas‑liquid interface stability and cryogenic cavitation characteristics of the liquid‑sealing impeller，the effects of different groove structures on the sealing performance and cryogenic cavitation characteristics of the first‑stage liquid‑sealing impeller of the liquid oxygen turbopump were numerically analyzed.The results show that the sealing performance of the liquid‑sealing impeller is jointly influenced by the groove/blade structure，fluid flow guidance design（radial/backward‑leaning/backward‑bending），and configuration（blade‑type/flow passage‑type）.Radial blade structure demonstrates outstanding advantages in achieving low leakage and lower temperature rise，making them the preferred choice for most operating conditions.Compared to the radial flow channel structure，the radial blade structure reduces leakage by 96.3%，shaft power increases by 14.8%，and sealing power ratio reduces by 2%.Backward‑leaning/ backward‑bending structure significantly enhance gas‑liquid interface stability by optimizing flow guidance，serving as the primary option for prioritizing stability.A backflow vortex is formed in the outer clearance of the groove on the outer diameter side of backward‑leaning/ backward‑bending structure，which increases the shaft power by about 14.8% and 25.0% respectively compared to the radial flow channel structure.Flow channel structure（especially backward‑leaning） can be considered as alternative solutions under high‑speed conditions.The research results can provide a reference for the design of liquid‑sealing impeller of liquid oxygen turbopump.
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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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