| 引用本文: | 王凯,孙科,张亮.不同速比下纵摇运动对立轴叶轮的性能影响[J].哈尔滨工业大学学报,2017,49(10):145.DOI:10.11918/j.issn.0367-6234.201604107 |
| WANG Kai,SUN Ke,ZHANG Liang.The effect of pitching motion on the hydrodynamic performance of vertical axis turbine under different speed ratios[J].Journal of Harbin Institute of Technology,2017,49(10):145.DOI:10.11918/j.issn.0367-6234.201604107 |
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| 摘要: |
| 浮式立轴水轮机在波浪中会发生纵摇运动，为了研究纵摇对立轴水轮机的水动力性能影响，将浮式垂直轴叶轮在波浪作用下摇荡运动的复杂模型简化为叶轮在均匀流中叠加简谐摇荡运动，应用ANSYS-CFX软件，采用动网格和滑移网格相结合的技术建立了垂直轴叶轮旋转和摇荡运动的数值模拟方法, 并和在均匀流中的水轮机作对比，而且对水轮机的推力系数和侧向力系数的时历曲线用最小二乘法进行拟合分析，得到水轮机阻尼系数和附加质量系数.结果表明：纵摇运动下的水轮机效率会稍微高于均匀流中的水轮机效率；纵摇运动下的水轮机推力和侧向力波动幅值有大幅增加，对水轮机结构强度及疲劳效应产生不利影响；阻尼力是水轮机纵摇运动中的主要成分，附加质量力占的影响较小.
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| 关键词: 立轴水轮机 纵摇运动 阻尼系数 附加质量系数 水动力性能 最小二乘法 |
| DOI：10.11918/j.issn.0367-6234.201604107 |
| 分类号:TK730,O352 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(11572094)；黑龙江省自然科学基金(E2016021)；上海交通大学海洋工程国家重点实验室开放课题(1606) |
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| The effect of pitching motion on the hydrodynamic performance of vertical axis turbine under different speed ratios |
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WANG Kai,SUN Ke,ZHANG Liang
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(Deepwater Engineering Research Center, Harbin Engineering University, Harbin 150001, China)
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| Abstract: |
| Floating vertical axis tidal current turbine (VATT) will occur pitching motion response in waves. To study the effect of pitching motion, a complex model of VATT moving in the waves is simplified to an impeller moving in the uniform current and superposed with harmonic motions, and the hydrodynamic performance of VATT is studied based on CFD viscous theory and ANSYS-CFX software, as well as the moving mesh and the sliding mesh. The CFX software is used to simulate the pitching motion under different speed ratio and rotating impeller is forced to pitch. The thrust coefficient and lateral force coefficient time history curves are also analyzed under different speed ratio by the method of least squares. The results show that, compared with turbine only rotating in uniform stream, the turbine under pitching motions has a little higher value in turbine's energy utilization. The instantaneous fluctuation amplitude of the thrust and lateral force under pitching motion are obviously higher than that of turbine under uniform stream, which is bad for the structural strength and fatigue effect of turbine in waves. The damping force is the main ingredient to turbine under pitching motion and the effect of added mass force is small.
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| Key words: vertical axis turbine pitching damping coefficient added mass coefficients hydrodynamic performance least squares |
