开发和利用可再生能源是解决能源危机的重要途径。波浪能作为一种可再生能源引起了世界各国的关注,其中振荡水柱(Oscillating Water Column,OWC)式波能装置是一种应用最广泛的波浪能转换技术。关于OWC的研究多集中于如何提高能量转换效...开发和利用可再生能源是解决能源危机的重要途径。波浪能作为一种可再生能源引起了世界各国的关注,其中振荡水柱(Oscillating Water Column,OWC)式波能装置是一种应用最广泛的波浪能转换技术。关于OWC的研究多集中于如何提高能量转换效率,但是由于海况的复杂性,装置面临很大的生存压力,提高装置的生存能力变得愈加重要。透空式防波堤形式已经有很多应用,它对高频短波消浪效果很好,对低频长波则较差,而振荡水柱波能装置对长波吸收能力较强。该研究将透空式防波堤和OWC装置有效结合起来,基于线性势流理论,运用分离变量法和特征函数匹配法建立了解析模型,研究了单独透空式防波堤形式下,不同开孔率对反射系数的影响;之后研究了集成系统下透空结构与OWC装置距离对反射系数、水动力效率等的影响,并与单独透空式防波堤和单独OWC装置对比,说明集成装置消浪的优越性。展开更多
待分解信号复杂度增大时传统单信号分解技术易产生过高特征空间维度的高频本征模态函数(intrinsic mode function,IMF),从而严重限制了长短时记忆神经网络(long short term memory,LSTM)的长时序预报能力。以舟山群岛南部外海某观测点...待分解信号复杂度增大时传统单信号分解技术易产生过高特征空间维度的高频本征模态函数(intrinsic mode function,IMF),从而严重限制了长短时记忆神经网络(long short term memory,LSTM)的长时序预报能力。以舟山群岛南部外海某观测点所收集的海浪数据为基础,提出融合ICEEMDAN-VMD级联分解策略和LSTM的混合模型。该混合模型准确捕捉海洋波浪的非线性特征和长时序依赖规律,提高了复杂海况下对有效波高、有效波周期、波向的长时预报能力。与多变量LSTM模型相比,混合模型的48 h和72 h有效波高预测均方根误差(root mean square error,RMSE)降幅分别为53.9%和33.8%,有效波周期预测RMSE降幅分别为46.1%和39.1%,波向预测RMSE降幅分别为30.5%和23.9%。与EMD-LSTM模型相比,混合模型有效波高、有效波周期、波向的RMSE平均降幅分别为13.52%、17.79%、15.39%。展开更多
近海固定式海上风机基础,多采用大直径单桩钢管,对其进行合理改造可作为振荡水柱式(Oscillating Water Column,OWC)波浪能发电装置的捕能气室。本文提出了一种将固定式单桩基础与OWC装置耦合的结构方案,即在单桩基础的水下合理位置开孔...近海固定式海上风机基础,多采用大直径单桩钢管,对其进行合理改造可作为振荡水柱式(Oscillating Water Column,OWC)波浪能发电装置的捕能气室。本文提出了一种将固定式单桩基础与OWC装置耦合的结构方案,即在单桩基础的水下合理位置开孔,水面以上加装导流管道、空气透平及出气管道,从而形成内置式OWC装置。由于本文只研究OWC装置的一级能量转换过程,所以不考虑空气透平及发电机等后端设备,仅用气孔来代替后端设备所产生的压降作用。为揭示新型OWC装置的获能机理,通过数值模拟计算,研究了方形、椭圆形、圆形三种开孔形状,开孔吃水深度d/h为0.13、0.27、0.40和0.53四种情况,以及开孔大小s/S_(c)为0.054和0.042两种条件下影响OWC装置水动力性能的3个主要因素。结果表明,当气室开孔型式为方形,d/h=0.13,s/S_(c)=0.054时,气室的捕获宽度比ξ最佳,ξ最大可达0.23。展开更多
With the depletion of fossil fuels and increasing environmental concerns,the development of renewable energy,such as wave energy,has become a critical component of global energy strategies.However,challenges persist i...With the depletion of fossil fuels and increasing environmental concerns,the development of renewable energy,such as wave energy,has become a critical component of global energy strategies.However,challenges persist in the field testing methodologies for wave energy converters(WECs).In this paper,a numerical wave field of the Dawanshan Island Sea Area in Zhuhai City is constructed based on the MIKE21 SW wave model and by using an NCEP wind field driving model.In conjunction with the IEC-62600-100 standard,by taking site testing of the“Wanshan”wave energy converter on which a sea trial has been conducted in Dawanshan Island of Zhuhai city as an example,research on-site testing method for a wave energy converter has been carried out.The wave measurement position for the“Wanshan”converter was determined by combining statistically analyzed field data with a validated numerical wave model.By comparing a valid wave height at the position where a wave rider is located with a valid wave height at the position where the“Wanshan”wave energy converter is situated,the correlation coefficient between simulation and observed data reached 0.90,with a root-mean-square error of 0.19.The representativeness of wave measurement data during site testing is verified and can be used as a basis for calculating the input energy of the“Wanshan”wave energy converter.展开更多
文摘开发和利用可再生能源是解决能源危机的重要途径。波浪能作为一种可再生能源引起了世界各国的关注,其中振荡水柱(Oscillating Water Column,OWC)式波能装置是一种应用最广泛的波浪能转换技术。关于OWC的研究多集中于如何提高能量转换效率,但是由于海况的复杂性,装置面临很大的生存压力,提高装置的生存能力变得愈加重要。透空式防波堤形式已经有很多应用,它对高频短波消浪效果很好,对低频长波则较差,而振荡水柱波能装置对长波吸收能力较强。该研究将透空式防波堤和OWC装置有效结合起来,基于线性势流理论,运用分离变量法和特征函数匹配法建立了解析模型,研究了单独透空式防波堤形式下,不同开孔率对反射系数的影响;之后研究了集成系统下透空结构与OWC装置距离对反射系数、水动力效率等的影响,并与单独透空式防波堤和单独OWC装置对比,说明集成装置消浪的优越性。
文摘待分解信号复杂度增大时传统单信号分解技术易产生过高特征空间维度的高频本征模态函数(intrinsic mode function,IMF),从而严重限制了长短时记忆神经网络(long short term memory,LSTM)的长时序预报能力。以舟山群岛南部外海某观测点所收集的海浪数据为基础,提出融合ICEEMDAN-VMD级联分解策略和LSTM的混合模型。该混合模型准确捕捉海洋波浪的非线性特征和长时序依赖规律,提高了复杂海况下对有效波高、有效波周期、波向的长时预报能力。与多变量LSTM模型相比,混合模型的48 h和72 h有效波高预测均方根误差(root mean square error,RMSE)降幅分别为53.9%和33.8%,有效波周期预测RMSE降幅分别为46.1%和39.1%,波向预测RMSE降幅分别为30.5%和23.9%。与EMD-LSTM模型相比,混合模型有效波高、有效波周期、波向的RMSE平均降幅分别为13.52%、17.79%、15.39%。
文摘近海固定式海上风机基础,多采用大直径单桩钢管,对其进行合理改造可作为振荡水柱式(Oscillating Water Column,OWC)波浪能发电装置的捕能气室。本文提出了一种将固定式单桩基础与OWC装置耦合的结构方案,即在单桩基础的水下合理位置开孔,水面以上加装导流管道、空气透平及出气管道,从而形成内置式OWC装置。由于本文只研究OWC装置的一级能量转换过程,所以不考虑空气透平及发电机等后端设备,仅用气孔来代替后端设备所产生的压降作用。为揭示新型OWC装置的获能机理,通过数值模拟计算,研究了方形、椭圆形、圆形三种开孔形状,开孔吃水深度d/h为0.13、0.27、0.40和0.53四种情况,以及开孔大小s/S_(c)为0.054和0.042两种条件下影响OWC装置水动力性能的3个主要因素。结果表明,当气室开孔型式为方形,d/h=0.13,s/S_(c)=0.054时,气室的捕获宽度比ξ最佳,ξ最大可达0.23。
基金supported by the“National Ocean Technology Center Innovation Fund”under Project No.N3220Z002,led by Ning Jia.The official website of the National Ocean Technology Center is accessible at:http://www.notcsoa.org.cn/.
文摘With the depletion of fossil fuels and increasing environmental concerns,the development of renewable energy,such as wave energy,has become a critical component of global energy strategies.However,challenges persist in the field testing methodologies for wave energy converters(WECs).In this paper,a numerical wave field of the Dawanshan Island Sea Area in Zhuhai City is constructed based on the MIKE21 SW wave model and by using an NCEP wind field driving model.In conjunction with the IEC-62600-100 standard,by taking site testing of the“Wanshan”wave energy converter on which a sea trial has been conducted in Dawanshan Island of Zhuhai city as an example,research on-site testing method for a wave energy converter has been carried out.The wave measurement position for the“Wanshan”converter was determined by combining statistically analyzed field data with a validated numerical wave model.By comparing a valid wave height at the position where a wave rider is located with a valid wave height at the position where the“Wanshan”wave energy converter is situated,the correlation coefficient between simulation and observed data reached 0.90,with a root-mean-square error of 0.19.The representativeness of wave measurement data during site testing is verified and can be used as a basis for calculating the input energy of the“Wanshan”wave energy converter.
