Air-core characteristics in a swirling tunnel flow
作者机构：State Key Laboratory of Eco-hydraulics in Northwest Arid RegionXi'an University of TechnologyXi'an 710048China College of Energy and Power EngineeringLanzhou University of TechnologyLanzhou 730050China Department of Civil and Architectural EngineeringRoyal Institute of Technology(KTH)StockholmSweden
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2022年第34卷第4期
页 面：634-646页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：the National Natural Science Foundation of China(Grant Nos.52069011,51509123) the Open Research Fund Program of State Key Laboratory of Ecohydraulics in Northwest Arid Region,Xi'an University of Technology(Grant No.2019KFKT-9),the Red Willow Excellent Youth Project of Lanzhou Universityof Technology
主 题：Horizontal tunnel swirlingflow air core air-carrying capacity scale effect
摘 要：A cost-effective technique to dissipate the energy in hydropower systems is the formation of a swirling flow within a *** such flows,an air core with a significant cross section usually *** 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 *** 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 *** 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 *** 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 *** 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 *** work provides a reference for the application of the swirling flows in horizontal hydropower tunnels.
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