复杂潮流条件下导管涡轮机的水动力学性能  

Hydrodynamic performance of ducted turbine under complex tidal current conditions

作　　者：宋科 杨邦成[2] SONG Ke;YANG Bangcheng(School of Mechanical and Electrical Engineering,Kunming University,Kunming,Yunnan 650214,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming,Yunnan 650500,China)

机构地区：[1]昆明学院机电工程学院,云南昆明650214 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《排灌机械工程学报》2021年第8期826-831,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(11172116);昆明学院人才引进项目(YJL20023)。

摘　　要：为了探究导管涡轮机在复杂潮流条件下的非定常性能,依据斋堂岛海域的潮流条件,采用计算流体力学(CFD)数值模拟方法分析了浸没深度和偏流角对导管涡轮机水动力学性能及尾流场流态的影响.研究结果表明:不同浸没深度和偏流角下的导管涡轮机水动力学性能均表现出与波浪频率一致的时间周期性行为;在波流作用下,随着浸没深度的减小,水流将发生强烈的跃迁,由波流引起的水动力学性能波动幅值增大;在波流与偏流共同作用下,随着偏流角的增大,导管涡轮机的平均功率系数及推力系数逐渐减小.此外,水动力学性能在叶轮旋转周期内将出现额外的周期性波动,该波动频率由叶轮转速和叶片数决定,且波动幅值随着偏流角的增加而增大,导管涡轮机后方的尾流场结构也将变得相当不稳定和复杂.In order to explore the unsteady performance of ducted turbine under complex tidal current conditions,the effects of immersion depth and the yaw angle on hydrodynamics and wake flow pattern of ducted turbine were analyzed by computational fluid dynamics(CFD)method under the tidal current conditions in Zhaitang Island.The results reveals that the hydrodynamic performance of ducted turbine with different immersion depths and yaw angles reveals time periodic behavior consistent with the wave frequency.There is a strong transition on flow and a higher-amplitude fluctuation on hydrody-namic performance caused by wave-current effect with the decrease of immersion depth.The average power coefficient and thrust coefficient of ducted turbine decrease gradually with the increase of yaw angle under wave-current and yaw flow effect.Besides,it will also cause additional periodic fluctuations in hydrodynamic performance during one rotating period of the rotor,and the frequency of the fluctuation is determined by the rotational speed and the number of blades.The fluctuation amplitude increases with the increase of yaw angle,and the wake structure behind ducted turbine will become quite unstable and complex.

关 键 词：复杂潮流条件 导管涡轮机 浸没深度 偏流角 水动力学性能 

分 类 号：TK730.2[交通运输工程—轮机工程]