摘要
为了解决潮流能导管涡轮机来流阻力及尾部回流过大的技术问题,对一种带流道环的导管涡轮机的水动力学性能进行非定常数值模拟,并从流道环宽度、流道环数和流道环形状3个方面对系统的轴向阻力、叶轮压力脉动及尾流场流态的影响进行分析。研究结果表明:直流道环导管涡轮机相比原导管涡轮机有效减小了系统轴向阻力、叶轮载荷及压力脉动幅值,降低了结构的疲劳风险。此外,相关尾流场分析指出直流道环的射流作用能显著减少尾部的低速条带和回流区尺度,加快近尾流场的流速恢复。且随着直流道环宽度及数量的增加,射流将向导管尾端流域注入更多的动量,尾流恢复更快,系统的减阻效果也进一步得到了增强。而弯流道环导管涡轮机的偏转射流增加了尾流的复杂程度,在阻碍尾流向下游自由扩散的同时也增加了载荷及叶轮压力的脉动幅值,不利于系统的减阻。
In order to solve the technical problems of excessive flow resistance and tail backflow of tidal ducted turbine,the hydrodynamic performance of a type of ducted turbine with flow path ring is studied by unsteady numerical simulation.The effects of width,number and shape of flow path ring on axial resistance,rotor pressure fluctuation and flow pattern of wake field on ducted turbine system is analyzed.The results show that compared with the original ducted turbine,the ducted turbine with flow path ring can effectively reduce the axial resistance of the system,the load and pressure fluctuation on rotor and the fatigue risk of structure.In addition,the analysis of the wake field shows that the jet of straight flow path ring can significantly reduce the low-speed streak and the size of the reversed flow zone,and accelerate the wake recovery of near wake field.With the increase of the width and number of flow path ring,the jet injects more momentum into the tail flow field of the duct,the wake recovery becomes faster and the drag reduction effect of the system is further enhanced.The deflected jet of the ducted turbine with curved flow path ring increases the complexity of the wake field,hinders the free diffusion of the downstream flow field,increase the fluctuation amplitude of load and rotor pressure,which is not conducive to the drag reduction of the system.
作者
宋科
杨邦成
SONG Ke;YANG Bangcheng(School of Mechanical and Electrical Engineering,Kunming University,Kunming 650214,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)
出处
《船舶工程》
CSCD
北大核心
2021年第10期44-48,91,共6页
Ship Engineering
基金
昆明学院人才引进项目(YJL20023)。
关键词
潮流能
导管涡轮机
流道环
减阻
射流
尾流场
tidal current energy
ducted turbine
flow path ring
drag reduction
jet
wake field
