The effects of surge motion of the floating platform on hydrodynamics performance of horizontal-axis tidal current turbine
The effects of surge motion of the floating platform on hydrodynamics performance of horizontal-axis tidal current turbine
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DOI：
10.1016/j.renene.2014.09.002
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发表时间：
2015-02
期刊：
影响因子：
8.7
通讯作者：
Liang Zhang;Shu-qi Wang;Qi-hu Sheng;Feng-mei Jing;Yong Ma
中科院分区：
文献类型：
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作者：
Liang Zhang;Shu-qi Wang;Qi-hu Sheng;Feng-mei Jing;Yong Ma
在实际运行条件下，浮动式水平轴涡轮机的水动力特性受涡轮机系统浮动平台的波浪运动响应影响。本文采用CFX软件分析了涡轮机在恒定来流条件下受激振动时的水动力性能，研究了喘振频率、喘振幅值和转速比对涡轮机水动力性能的影响。基于CFX仿真数据，对喘振涡轮机轴向力时变曲线进行最小二乘拟合，得到轴向阻尼系数。仿真结果表明，与涡轮机在恒定来流条件下旋转时相比，喘振涡轮机的轴载荷和能量利用率分别出现振荡，且这两个参数的振荡幅度与喘振频率和幅值以及转速比呈正相关;喘振频率和幅值对轴向阻尼系数影响不大，但轴向阻尼系数与涡轮机转速成正比。研究结果可为浮式潮流涡轮机系统浮式平台的运动响应研究和输出电能的控制设计提供数据。
Under practical operation conditions, hydrodynamic characteristics of floating horizontal-axis turbine are affected by the wave-induced motion response of the floating platform for the turbine system. In this thesis, CFX software is adopted to analyze the hydrodynamic performance of the turbine in constant inflow with the turbine being forced vibrating and to study how the hydrodynamic performance of the turbine is influenced by surge frequency, surge amplitude and speed ratio. Based on the simulation data from CFX, axial damping coefficient can be obtained by least square fitting the time-varying axial force curves of surging turbine. The simulation results demonstrate that compared with turbine only rotating in constant inflow, shaft loads and energy utilization ratio of the surging turbine experience oscillations respectively; the oscillation amplitudes of these two parameters have a positive correlation with the frequency and amplitude of the surge and speed ratio; the frequency and amplitude of the surge have little impact on axial damping coefficient but this coefficient is positively proportioned to the rotational speed of the turbine. The results of this study can provide data to study motion response of floating platform for floating tidal current turbine system and control design of the output electricity.