排灌机械工程学报
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排灌机械工程学报  2017, Vol. 35 Issue (5): 393-397    DOI: 10.3969/j.issn.1674-8530.16.0238
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变桨距角下水平轴海流能水轮机水动力特性及结构性能
刘恒, 王文全, 闫妍
昆明理工大学建筑工程学院, 云南 昆明 650500
Hydrodynamic and structural characteristics of horizontal axis current turbine under different pitch angles
LIU Heng, WANG Wenquan, YAN Yan
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
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摘要 基于CFD对海流能水轮机二维水翼进行数值模拟,通过分析不同攻角下的升阻比,得到了该水翼的最佳攻角.利用Matlab对Wilson设计法进行编程,完成设计功率为20 kW海流能水轮机叶片的三维设计.利用CFD对水平轴海流能整体发电装置及支撑结构周围流场进行了计算,研究了功率系数、力矩系数和轴向力系数在不同桨距角下随叶尖速比的变化情况;采用有限单元法对水动力载荷作用下的水平轴潮流能整体发电装置进行结构计算,探讨了水轮机叶片的应力和应变在不同桨距角下随叶尖速比的变化情况.结果表明:在1°~5°的桨距角范围内,增大桨距角,有利于低转速下启动水轮机;流速过大时,增大桨距角可有效减小轴向荷载及叶片的形变和应力;在最优工况下,水轮机的功率系数达到0.301,并且满足材料强度要求.研究成果有益于海流能水轮机装置的设计和优化.
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刘恒
王文全
闫妍
关键词水平轴海流能水轮机   水动力特性   应力应变   攻角   桨距角   叶尖速比   数值模拟     
Abstract: Based on the results of a two-dimensional hydrofoil obtained by computational fluid dynamics(CFD), the best angle of attack for the hydrofoil determined firstly by means of the lift to drag ratio chart at various angles of attack. The three-dimensional blades of a horizontal axis current turbine with 20 kW rated power were designed by using the Wilson method in Matlab. The hydrodynamic characteristics of the current turbine, such as the power, moment and axial thrust coefficients were predicted using CFD under different pitch angles and tip speed ratios. The static structural characteristics were also calculated using finite element method under various hydro-loads, the stress and strain in the blades were analyzed. The results showed that increasing pitch angle in the range of 1°-5° could be helpful to reduce the starting moment at a low tip speed ratio, moreover, increasing pitch angle can reduce the axial load, deformation and stress when the axial flow velocity is too high. The power coefficient of the turbine can reach to 0.301 and its structure can meet the requirements of material strength under the optimal operating condition. These achievements can be favourable to the design and optimization of marine current turbines.
Key wordshorizontal ocean current turbines   hydrodynamic characteristics   strain and stress   attack angle   pitch angle   tip speed ratio   numerical simulation   
收稿日期: 2016-10-11;
基金资助:国家自然科学基金资助项目(51479085,11262008);霍英东青年基金资助项目(141120)
通讯作者: 王文全(1977—),男,四川南充人,教授,博士生导师(wwqquan@126.com),主要从事多场耦合理论及其工程应用研究.   
作者简介: 刘恒(1992—),男,河南开封人,硕士研究生(309630766@qq.com),主要从事水力机械研究.
引用本文:   
刘恒,王文全,闫妍. 变桨距角下水平轴海流能水轮机水动力特性及结构性能[J]. 排灌机械工程学报, 2017, 35(5): 393-397.
LIU Heng,WANG Wen-Quan,YAN Yan. Hydrodynamic and structural characteristics of horizontal axis current turbine under different pitch angles[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(5): 393-397.
 
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