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hydrodynamic characteristics and particle tracking of 90° lateral intakes at an inclined river slope

Water Science and Engineering 2024年第2期17卷 197-208页

作者： Wei He Si-yuan Feng Jian Zhang Hong-wu Tang Yang Xiao Sheng Chen Chun-sheng Liu College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China Collaborative Innovation Center on Water Safety and Water Science Hohai UniversityNanjing 210098China

Lateral intakes are common in rivers.The pump effciency and sediment deposition are determined by the local hydrodynamic characteristics and mainstream division width.The hydraulic characteristics of lateral withdrawal from inclined river slopes at different intake elevations should be investigated.Meanwhile,the division width exhibits significant vertical non-uniformity at an inclined river slope,which should be clarified.Hence,a three-dimensional(3-D)hydrodynamic and particle-tracking model was developed with the Open Source Field Operation and Manipulation(Open FOAM),and the model was validated with physical model tests for 90°lateral withdrawal from an inclined side bank.The flow fields,withdrawal sources,and division widths were investigated with different intake bottom elevations,withdrawal discharges,and main channel velocities.This study showed that under inclined side bank conditions,water entered the intake at an oblique angle,causing significant 3-D spiral flows in the intake rather than two-dimensional closed recirculation.A lower withdrawal discharge,a lower bottom elevation of the intake,or a higher main channel velocity could further strengthen this phenomenon.The average division width and turbulent kinetic energy were smaller under inclined side bank conditions than under vertical bank conditions.With a low intake bottom elevation,a low withdrawal discharge,or a high main channel velocity,the sources of lateral withdrawal were in similar ranges near the local inclined bank in the vertical direction.Under inclined slope conditions,sediment deposition near the intake entrance could be reduced,compared to that under vertical slope conditions.The results provide hydrodynamic and sediment references for engineering designs for natural rivers with inclined terrains.

关键词： Lateral withdrawal hydrodynamic characteristics Particle tracking Inclined river slope Bottom elevation of intake OpenFOAM

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hydrodynamic characteristics of the Biplane-Type Otter Board with the Canvas Through Flume−Tank Experiment

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China Ocean Engineering 2022年第6期36卷 911-921页

作者： XIE Si-jie WU Ru-ke HU Fu-xiang SONG Wei-hua Department of Marine Fisheries Zhejiang Ocean UniversityZhoushan 316022China Key Laboratory of Marine Fishery Equipment and Technology of Zhejiang Zhoushan 316022China Tokyo University of Marine Science and Technology MinatoTokyo 108-8477Japan

hydrodynamic characteristics of a biplane-type otter board,equipped with nylon canvas of 2 mm in thickness was investigated through flume-tank experiment in this study.A series of predesigned structures with different gap-chord ratios G/c(0.75,0.90,1.05),stagger anglesθ(30°,45°,60°),and proportions of flexible area relative to the whole wing areaƒr(0,55%,65%,75%),at an aspect ratio of 2.0 and a camber ratio of 15%,were experimentally carried out.The results showed the solution referring to the usage of flexible canvas replacing part of rigid structure for the biplane-type otter board was efficient for the trawling in the middle or shallow water area.The improvement of lift and stability for the biplane-type otter board was concluded,and drag of the structure was reduced by 1.9%atƒr=55%.In addition,the coefficient of variation of the lift and drag coefficient at different current velocities were 2.69%and 2.28%,respectively,which was smaller than those at relatively large proportion of the flexible area.Compared with the other tested structures,the frame-type flexible structure with the gap-chord ratio of 0.9 and a stagger angle of 45°and the proportion of the flexible area of 55%,performed best,and its drag was reduced by 5.72%and lift increased by 4.8%,compared with the rigid biplane-type otter board at the angles of attack from 18°to 28°.

关键词： frame-type flexible structure hydrodynamic characteristics proportion of flexible area flume−tank experiment

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Global cavitation and hydrodynamic characteristics of a composite propeller in non-uniform wake

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水动力学研究与进展B辑:英文版 2023年第3期35卷 498-515页

作者： Dan-dan Zhang Lu-lu Dong Qin Wu Jing Zhang Guo-yu Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China China Academy of Launch Vehicle Technology Systems Engineering Division Beijing 100076China

The composite propeller has attracted much interest due to its excellent mechanical properties such as high specific stiffness and high specific strength,hence there is an increasing interest in utilizing the composite materials to improve the hydrodynamic and structural performance of marine propellers.The objective of this paper is to study the cavitation performance of composite propellers based on the unsteady simulation method considering the cavitation-composite structure interaction.The typical cavitation patterns around the composite propeller are studied,which include blade sheet cavitation and tip vortex cavitation.The unsteady flow characteristics of tip vortex cavitation and structural dynamic response of composite propeller are studied,and the mechanism of composite propeller for the cavitation suppression and efficiency improvement is revealed.The results show that compared with rigid propellers,composite propellers have smaller cavity volume and higher propulsion efficiency under the same conditions.The unsteady cavitating flow characteristics under non-uniform wake are periodic,and the phase lag of hydrodynamic coefficients of composite propeller can be observed compared with that of the rigid propeller.The bending-torsional coupling deformation of the composite propeller makes the pressure pulsation of the flow field gentler,which reduces the influence of the cavitation load on the composite propeller.

关键词： Composite propeller unsteady cavitation hydrodynamic characteristics fluid-structure interaction(FSI)

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Recent progress in hydrodynamic characteristics research and application of annular centrifugal extractors

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 854-873页

作者： Hang Yang Xiaoyong Yang Xiao Dong Zhaojin Lu Zhishan Bai Yinglei Wang Fulei Gao School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Xi'an Modern Chemistry Research Institute Xi'an 710000China

The annular centrifugal extractor(ACE)integrates mixing and separation.It has been widely used in many industrial fields because of its low residence time,compact structure,and high mass transfer efficiency.Most of the literature has focused on flow instabilities,flow visualization,and computational fluid dynamics simulations.More recently,research on hydrodynamic behavior and structural optimization has received widespread attention.With the development of ACE technology,applications have been broadened into several new areas.Hence,this paper reviews research progress regarding ACE in terms of hydrodynamic characteristics and the structural improvements.The latest applications covering hydrometallurgy,nuclear fuel reprocessing,bio-extraction,catalytic reaction,and wastewater treatment are presented.We also evaluate future work in droplet breakup and coalescence mechanisms,structural improvements specific to different process requirements,scaling-up methods,and stability and reliability after scaling-up.

关键词： annular centrifugal extractor hydrodynamic characteristics structure optimization the latest application

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hydrodynamic characteristics and Sediment Transport of A Tidal River Under Influence of Wading Engineering Groups

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China Ocean Engineering 2013年第6期27卷 829-842页

作者：陈珺唐洪武肖洋嵇敏 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University College of Dayu Hohai University

By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Then a mathematical model is used to reveal the influence mechanism on hydrodynamic characteristics and sediment transport of the wading engineering groups such as a tide gate, a breakwater, reservoirs, bridges and wharves, which were built in different periods. The results showed the hydrodynamic characteristics and sediment transport of the Yong River changed obviously due to the wading engineering groups. The tide gate induced deformation of the tidal wave, obvious reduction of the tidal influx and weakness of the tidal dynamic, decrease of the sediment yield of flood and ebb tide and channel deposition. The breakwater blocked estuarine entrances, resulting in the change of the tidal current and the reduction of the tidal influx in the estuarine area. The large-scale reservoirs gradually made the decrease of the Yong River runoff. The bridge and wharf groups took up cross-section areas, the cumulative affection of which caused the increase of tidal level in the tidal river.

关键词： hydrodynamic characteristics sediment transport wading engineering groups tidal river tide gate

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hydrodynamic characteristics OF CHINESE STURGEON SPAWNING GROUND IN YANGTZE RIVER

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Journal of hydrodynamics 2008年第2期20卷 225-230页

作者： YANG Yu YAN Zhong--min CHANG Jian-bo Nanjing Hydraulic Research Institute Nanjing 210029 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210029 China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China Institute of Hydro-ecology Wuhan 430072 China

Since the construction of the Gezhouba Dam on the Yangtze River in 1981, it has been found that the Chinese Sturgeon, Acipensor sinensis, performs natural propagation annually in a narrow reach downstream close to the Gezhouba Dam site. This might allow one to better investigate the river hydrodynamic conditions of the Chinese Sturgeon spawning ground. In this article, spatial Kinetic Energy Gradient （KEG） and absolute value of vorticity were computed along the river sections from measured data. The relation between Spawn Density per Unit Area （SDUA） and vorticity strength and between SDUA and KEG were worked out. The Results showed that the vorticity and KEG were both effective parameters for describing the hydrodynamic characteristics of Chinese Sturgeon spawning ground. The Chinese Sturgeons prefer to spawn in the river sections where the value of vorticity strength is larger than 0.4 s^-1 and KEG is larger than 0.029 Jkg^-1m^-1.

关键词： hydrodynamic characteristics Chinese Sturgeon spawning ground vorticity kinetic energy gradient Spawn Densityper Unit Area （SDUA）

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Effect of hydrodynamic characteristics on reaeration process

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Journal of Environmental Sciences 2002年第3期14卷 393-398页

作者： LiR LuoL TheStateKeyHydraulicsLaboratoryofHighSpeedFlows SichuanUniversityChengdu610065China.e－mail：liranban@*** TheStateKeyHydraulicsLaboratoryofHighSpeedFlows SichuanUniversityChengdu610065Chi

The equilibrium\|perturb technique was used in the flume reaeration experiment. The interfacial mass transfer coefficients of DO were obtained by implementation of the oxygen\|flux theory in the study. The turbulence characteristics of the flow field were investigated by numerical simulation approach. The expression of interfacial mass transfer coefficient related with velocity and turbulence kinetic energy was built. Examination with the experimental datum of different cases showed the validation of the expression.

关键词： reaeration hydrodynamic characteristics

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THE hydrodynamic characteristics OF FREE VARIABLE-PITCH VERTICAL AXIS TIDAL TURBIN

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Journal of hydrodynamics 2012年第6期24卷 834-839页

作者： ZHANG Xue-weii WANG Shu-qi WANG Feng ZHANG Liang SHENG Qi-hu Institute of Ocean Renewable Energy System Harbin Engineering University

The hydrodynamic characteristics of free variable-pitch vertical axis tidal turbine are investigated by combining experimental and numerical simulations. The variations of hydrodynamics are obtained based on testing the kinematics and the dynamics of the turbine under different flow and structural conditions. Through analyzing the movement of the turbine and the characteristics of the flow field by numerical simulations, it is shown how the turbine＇s performance is improved.

关键词： tidal current energy vertical axis variable-pitch turbine hydrodynamic characteristics experiments

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Experimental Study on hydrodynamic characteristics of Vertical-Axis Floating Tidal Current Energy Power Generation Device

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China Ocean Engineering 2016年第5期30卷 749-762页

作者：马勇李腾飞张亮盛其虎张学伟姜劲 College of Shipbuilding Engineering Harbin Engineering University

To study the characteristics of attenuation, hydrostatic towage and wave response of the vertical-axis floating tidal current energy power generation device （VAFTCEPGD）, a prototype is designed and experiment is carried out in the towing tank. Free decay is conducted to obtain attenuation characteristics of the VAFTCEPGD, and characteristics of mooring forces and motion response, floating condition, especially the lateral displacement of the VAFTCEPGD are obtained from the towing in still water. Tension response of the #1 mooring line and vibration characteristics of the VAFTCEPGD in regular waves as well as in level 4 irregular wave sea state with the current velocity of 0.6 m/s. The results can be reference for theoretical study and engineering applications related to VAFTCEPGD.

关键词： tidal current energy power generation device experiment hydrodynamic characteristics attenuation wave response lateral displacement

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The experimental study of hydrodynamic characteristics of the overland flow on a slope with three-dimensional Geomat

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Journal of hydrodynamics 2018年第1期30卷 153-159页

作者：王广月孙国瑞李建康李炯 School of Civil Engineering Shandong University

The hydrodynamic characteristics of the overland flow on a slope with a three-dimensional Geomat are studied for different rainfall intensities and slope gradients. The rainfall intensity is adjusted in the rainfall simulation system. It is shown that the velocity of the overland flow has a strong positive correlation with the slope length and the rainfall intensity, the scour depth decreases with the increase of the slope gradient for a given rainfall intensity, and the scour depth increases with the increase of the rainfall intensity for a given slope gradient, the overland flow starts with a transitional flow on the top and finishes with a turbulent flow on the bottom on the slope with the three-dimensional Geomat for different rainfall intensities and slope gradients, the resistance coefficient and the turbulent flow Reynolds number are in positively related logarithmic functions, the resistance coefficient and the slope gradient are in positively related power functions, and the trend becomes leveled with the increase of the rainfall intensity. This study provides some important theoretical insight for further studies of the hydrodynamic process of the erosion on the slope surface with a three-dimensional Geomat.

关键词： Three-dimensional Geomat rainfall intensity slope gradient overland flow hydrodynamic characteristics

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