Effects of air-core vortex on the hydraulic instability of a bulb turbine
文献类型：期刊论文
| 作者 | Li ZX(李志祥)4; Yang ZX(杨子轩)4; Chen, Huixiang2,3,5; Xu, Hui2,3,5; Qian, Shangtuo2,3,5; Kan, Kan1,3,5 |
| 刊名 | JOURNAL OF HYDRAULIC RESEARCH
 |
| 出版日期 | 2025-07-04 |
| 卷号 | 63期号:4页码:473-488 |
| 关键词 | Air-core vortex entropy production pressure pulsation turbine hydraulic instability vortex rope |
| ISSN号 | 0022-1686 |
| DOI | 10.1080/00221686.2025.2521355 |
| 通讯作者 | Kan, Kan(kankan@hhu.edu.cn) |
| 英文摘要 | At low operating water levels, an air-core vortex can form at the turbine inlet, resulting in two-phase, highly swirling inflows and unit damage. We coupled the vortex field with the turbine's inlet boundary using bilinear interpolation and employed large-eddy simulation to replicate the unstable flow phenomena. The presence of the air-core vortex leads to a notable reduction in output and efficiency. As the air-core vortex disintegrates in the inlet channel, it transforms into an air-water mixture that travels along the upper wall without forming an air pocket. The air-core vortex increases the helical vortex pitch and expands the stalled region of the vortex rope. An air entrainment rate of 1.35% results in a 7.41% rise in entropy production, mainly occurring in the inlet channel. The amplitude of pressure pulsations increases at the precession frequency, while decreases at the high-frequency. The baroclinic torque budget is significant, reflecting the inhibitory effect of air-water interaction on small-scale vortices. |
| 分类号 | Q3 |
| WOS关键词 | LARGE-EDDY SIMULATION ; LEVEL-SET ; AXISYMMETRICAL BODY ; FLUCTUATIONS ; PREDICTION ; MODELS ; FLOW |
| 资助项目 | National Natural Science Foundation of China[52379086] ; National Natural Science Foundation of China[52476028] ; Chinese Academy of Sciences Project for Young Scientists in Basic Research[YSBR-087] ; Jiangsu Innovation Support Programme for International Science and Technology Cooperation[BZ2023047] |
| WOS研究方向 | Engineering ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001547010000001 |
| 资助机构 | National Natural Science Foundation of China ; Chinese Academy of Sciences Project for Young Scientists in Basic Research ; Jiangsu Innovation Support Programme for International Science and Technology Cooperation |
| 其他责任者 | Kan, Kan |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/103457]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Hohai Univ, Sch Elect & Power Engn, Nanjing 211100, Peoples R China 2.Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China; 3.Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Peoples R China; 4.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 5.Hohai Univ, Natl Engn Res Ctr Water Resources Efficient Utiliz, Nanjing 210098, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Li ZX,Yang ZX,Chen, Huixiang,et al. Effects of air-core vortex on the hydraulic instability of a bulb turbine[J]. JOURNAL OF HYDRAULIC RESEARCH,2025,63(4):473-488. |
| APA | 李志祥,杨子轩,Chen, Huixiang,Xu, Hui,Qian, Shangtuo,&Kan, Kan.(2025).Effects of air-core vortex on the hydraulic instability of a bulb turbine.JOURNAL OF HYDRAULIC RESEARCH,63(4),473-488. |
| MLA | 李志祥,et al."Effects of air-core vortex on the hydraulic instability of a bulb turbine".JOURNAL OF HYDRAULIC RESEARCH 63.4(2025):473-488. |
入库方式： OAI收割
来源：力学研究所
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