| 一种计算有限水深波能功率的新方法 |
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| 引用本文： | 李晖,何宏舟,杨绍辉,Sheng Wanan.一种计算有限水深波能功率的新方法[J].海洋学报,2018,40(12):1-10. |
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| 作者姓名： | 李晖 何宏舟 杨绍辉 Sheng Wanan |
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| 作者单位： | 1.集美大学 机械与能源工程学院, 福建 厦门 361021;福建省能源清洁利用与开发重点实验室 福建 厦门 361021;海洋可再生能源装备福建省高校重点实验室, 福建 厦门 361021;福建省清洁燃烧与能源高效利用工程技术研究中心, 福建 厦门 361021 |
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| 基金项目： | 国家自然科学基金项目（51409118,51779104）;Science Foundation Ireland （SFI） Centre for Marine and Renewable Energy Research （MaREI）（12/RC/2302）。 |
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| 摘 要： | 海洋波浪能平均功率的准确计算是波浪能开发和利用的基础。实践中,波浪能转换装置一般安装在有限水深区域。对于随机波,只有当详尽的波浪谱已知的时候,有限水深区的波能功率才能被准确计算出来。由于种种原因,实践中波浪的实测数据大多以散点图或有义波高和统计波周期的形式给出,而波浪谱信息有时则很难获得。基于这种情况,传统上人们利用无限水深条件下的相关公式来估算有限水深区域的波能功率,但这种做法会造成较大的误差。本研究显示,对于50 m水深的理论波谱JONSWAP谱来说该误差高达14.6%。为了提高波能功率计算的准确性,本文提出了一种基于能量频率的一阶和二阶近似算法,可以在未知波浪谱的情况下较为准确地计算不同水深时的波能功率。针对两种理论波浪谱的计算结果表明,本方法在计算有限带宽内的波能功率时计算误差低于2.8%。
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| 关 键 词： | 有限水深 波浪能 波能功率 波浪谱 |
| 收稿时间： | 2017/8/9 0:00:00 |
| 修稿时间： | 2018/9/18 0:00:00 |
A new method for calculating wave energy power in finite water depth |
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| Li Hui,He Hongzhou,Yang Shaohui and Sheng Wanan.A new method for calculating wave energy power in finite water depth[J].Acta Oceanologica Sinica (in Chinese),2018,40(12):1-10. |
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| Authors: | Li Hui He Hongzhou Yang Shaohui and Sheng Wanan |
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| Institution: | College of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China;Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen 361021, China;Key Laboratory of Ocean Renewable Energy Equipment, Fujian Province University, Xiamen 361021, China;Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Xiamen 361021, China,College of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China;Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen 361021, China;Key Laboratory of Ocean Renewable Energy Equipment, Fujian Province University, Xiamen 361021, China;Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Xiamen 361021, China,College of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China;Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen 361021, China;Key Laboratory of Ocean Renewable Energy Equipment, Fujian Province University, Xiamen 361021, China;Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Xiamen 361021, China and Centre for Marine and Renewable Energy, Environmental Research Institute, University College Cork, Cork P43 C573, Ireland |
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| Abstract: | The accurate calculation of ocean wave energy power is the basis for the development and utilization of wave energy. In practice, the wave energy converters are generally installed in finite water depths. For irregular waves, the amount of wave power can be calculated only when the detailed wave spectra are known. For a variety of reasons, most of the measured wave data in practice are given in the forms of scatter diagrams or of wave significant heights and statistical wave periods. As a result, the popular choice is to use the formulas for deep-water waves to calculate the wave power in finite depth, which will cause large errors. It will be shown in this study that for irregular wave of JONSWAP theoretical spectrum in the depth of 50 m, the calculation error is up to 14.6%. In order to improve the accuracy of wave power, a method called "first- and second-order approximations based on energy frequency" is proposed, with which the wave power for different depths can be calculated accurately in the cases where the wave spectra are unknown. The examples for two theoretical wave spectra show that the method can reduce the errors of wave power calculation in limited bandwidth to less than 2.8%. |
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| Keywords: | finite water depth wave energy wave power wave spectrum |
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