Air-core characteristics in a swirling tunnel flow

doi:10.1007/s42241-022-0047-y

	Air-core characteristics in a swirling tunnel flow
	Nan, Jun-hu1,2 ; Gao, Huan 2; Wang, Chao-qun 2; Ma, Kang-ning 2; Yang, James 3; Wei, Jia-fang 2; Li, Guo-dong 1
	2022-08
发表期刊	Journal of Hydrodynamics
ISSN	1001-6058
卷号	34 期号:4 页码:634-646
摘要	A cost-effective technique to dissipate the energy in hydropower systems is the formation of a swirling flow within a tunnel. In such flows, an air core with a significant cross section usually occurs. To reveal the air-core features in the horizontal tunnel of a high-head shaft spillway, laboratory tests, numerical modeling, and prototype observations are performed, to examine issues such as the formation of the air core, the interjacent air motion, the air-carrying capacity, and the scale effects. It is shown that the shape of the air core varies greatly in the axial and radial directions along the tunnel and that the center of the core deviates from the axis of the tunnel. The motion of the air within the core is caused by the combined action of the water entrainment on the inner surface of the swirling flow and the axial pressure difference in the air core. The aeration process can be divided into five processes with respect to the changes of the gate openings. A theoretical expression is established for the air-carrying capacity of the swirling flow. The vacuum degree is the similarity condition of the air-carrying capacity of the swirling flow between the model and prototype tests based on the Froude law of the similitude, and this similarity condition is verified by both the model and prototype results. This work provides a reference for the application of the swirling flows in horizontal hydropower tunnels. © 2022, China Ship Scientific Research Center.
关键词	Air entrainment Hydroelectric power Swirling flow Air-carrying capacity Air-core Condition Core features Cost effective Energy Horizontal tunnel Hydropower system Scale effects Tunnel flow
DOI	10.1007/s42241-022-0047-y
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Mechanics
WOS类目	Mechanics
WOS记录号	WOS:000842366600001
出版者	Springer
EI入藏号	20223412621193
EI主题词	Cost effectiveness
EI分类号	611.1 Hydroelectric Power Plants ; 631.1 Fluid Flow, General ; 802.3 Chemical Operations ; 911.2 Industrial Economics
来源库	WOS
引用统计	被引频次[WOS]：0 [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/159775
专题	能源与动力工程学院
通讯作者	Li, Guo-dong
作者单位	1.Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Peoples R China; 2.Lanzhou Univ Technol, Coll Energy & Power Engn, Lanzhou 730050, Peoples R China; 3.Royal Inst Technol KTH, Dept Civil & Architectural Engn, Stockholm, Sweden
第一作者单位	能源与动力工程学院
推荐引用方式 GB/T 7714	Nan, Jun-hu,Gao, Huan,Wang, Chao-qun,et al. Air-core characteristics in a swirling tunnel flow[J]. Journal of Hydrodynamics,2022,34(4):634-646.
APA	Nan, Jun-hu.,Gao, Huan.,Wang, Chao-qun.,Ma, Kang-ning.,Yang, James.,...&Li, Guo-dong.(2022).Air-core characteristics in a swirling tunnel flow.Journal of Hydrodynamics,34(4),634-646.
MLA	Nan, Jun-hu,et al."Air-core characteristics in a swirling tunnel flow".Journal of Hydrodynamics 34.4(2022):634-646.