本文提出在振荡水柱(oscillating water column,简称OWC)波浪能转换装置中引入双空气透平结构的概念,在由圆筒形OWC装置与带导浪墙的直立防波堤耦合形成的一体化系统中,通过配置两台U形流道结构的冲击式空气透平,数值研究了一体化系统...本文提出在振荡水柱(oscillating water column,简称OWC)波浪能转换装置中引入双空气透平结构的概念,在由圆筒形OWC装置与带导浪墙的直立防波堤耦合形成的一体化系统中,通过配置两台U形流道结构的冲击式空气透平,数值研究了一体化系统从波浪能至电能的多过程能量转换的特性,并在空气透平处于自由启动和强制启动的两种工作模式下,与采用单空气透平的一体化系统的能量转换特性进行了对比。研究结果表明,在采用双透平的一体化系统中,虽然每个透平将波浪能转换为气动能的效率略低于采用单透平的系统,但是在双透平的协同作用下,系统的一级能量和总体能量转换效率要明显优于采用单透平的系统,其中,在自由启动模式下,一级能量转换效率和总体能量转换效率的峰值分别实现约56.4%和69.4%的增长。在特定周期波浪作用下,额外空气透平的引入还使得一体化系统的总电功率输出的峰值提升约66.57%。结果还表明,双空气透平的增效机理在于可以更有效地调整气室内外空气压差与空气流量,优化气室内的气动阻尼,从而实现波浪能的高效俘获与转换。展开更多
An analytical model of a floating heaving box integrated with a vertical flexible porous membrane placed right next to the box applications to wave energy extraction and breakwater systems is developed under the reduc...An analytical model of a floating heaving box integrated with a vertical flexible porous membrane placed right next to the box applications to wave energy extraction and breakwater systems is developed under the reduced wave equation.The theoretical solutions for the heave radiating potential to the assigned physical model in the corresponding zones are attained by using the separation of variables approach along with the Fourier expansion.Applying the matching eigenfunction expansion technique and orthogonal conditions,the unknown coefficients that are involved in the radiated potentials are determined.The attained radiation potential allows the computation of hydrodynamic coefficients of the heaving buoy,Power Take-Off damping,and wave quantities.The accuracy of the analytical solution for the hydrodynamic coefficients is demonstrated for different oblique angles with varying numbers of terms in the series solution.The current analytical analysis findings are confirmed by existing published numerical boundary element method simulations.Several numerical results of the hydrodynamic coefficients,power capture,power take-off optimal damping,and transmission coefficients for numerous structural and physical aspects are conducted.It has been noted that the ideal power take-off damping increases as the angle of incidence rises,and the analysis suggests that the ability to capture waves is more effective in shallower waters compared to deeper ones.展开更多
Wave energy is a promising form of marine renewable energy that offers a sustainable pathway for electricity generation in coastal regions.Despite Malaysia’s extensive coastline,the exploration of wave energy in Sara...Wave energy is a promising form of marine renewable energy that offers a sustainable pathway for electricity generation in coastal regions.Despite Malaysia’s extensive coastline,the exploration of wave energy in Sarawak remains limited due to economic,technical,and environmental challenges that hinder its implementation.Compared to other renewable energy sources,wave energy is underutilized largely because of cost uncertainties and the lack of local performance data.This research aims to identify themost suitable coastal zone in Sarawak that achieves an optimal balance between energy potential,cost-effectiveness,and environmental impact,particularly in relation to infrastructure and regional development.The findings indicate that wave energy generation in Sarawak is technically feasible based on MOGA analysis.Among the studied sites,Bintulu emerged as the most balanced option,with a levelized cost of electricity(LCOE)of 0.778–0.864 USD/kWh and a CO_(2) emission factor as low as 0.019–0.020 CO_(2)/k Wh.Miri,while producing lower emissions than Sematan,recorded a higher LCOE of 1.045 USD/kWh with moderate emissions at 0.029 CO_(2)/kWh.Sematan,characterized by weaker wave conditions and higher installation penalties,resulted in the least favorable outcome,with an LCOE of 3.735 USD/kWh.Bintulu’s strategic location reduces CAPEX requirements,making it the most suitable site for large-scale wave energy deployment in Sarawak.展开更多
The global shift towards sustainable energy has intensified research into renewable sources,particularly wave energy.Pakistan,with its long coastline,holds significant potential for wave energy development.However,ide...The global shift towards sustainable energy has intensified research into renewable sources,particularly wave energy.Pakistan,with its long coastline,holds significant potential for wave energy development.However,identifying optimal locations for wave energy plants involves evaluating complex,multi-faceted criteria.This study employs a multi-criteria group decisionmaking(MCGDM)approach using single-valued neutrosophic numbers(SVNNs)to address both qualitative and quantitative uncertainties inherent in real-world scenarios.To enhance decision quality,we introduce two novel operators:the singlevalued neutrosophic prioritised averaging(SVNPAd)operator and the single-valued neutrosophic prioritised geometric(SVNPGd)operator,both incorporating priority degrees.These tools allow decision-makers to express preferences better and handle ambiguous data.The proposed model is validated through comparative analysis with prior studies and demonstrates improved robustness in site selection.Furthermore,we analyse how variations in priority degrees influence decision outcomes,enabling a more dynamic and tailored decision-making process.Our method contributes a more holistic and adaptive framework for selecting locations for wave energy projects,ultimately supporting informed investments in renewable energy infrastructure and improving energy access in underserved coastal regions.展开更多
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
文摘本文提出在振荡水柱(oscillating water column,简称OWC)波浪能转换装置中引入双空气透平结构的概念,在由圆筒形OWC装置与带导浪墙的直立防波堤耦合形成的一体化系统中,通过配置两台U形流道结构的冲击式空气透平,数值研究了一体化系统从波浪能至电能的多过程能量转换的特性,并在空气透平处于自由启动和强制启动的两种工作模式下,与采用单空气透平的一体化系统的能量转换特性进行了对比。研究结果表明,在采用双透平的一体化系统中,虽然每个透平将波浪能转换为气动能的效率略低于采用单透平的系统,但是在双透平的协同作用下,系统的一级能量和总体能量转换效率要明显优于采用单透平的系统,其中,在自由启动模式下,一级能量转换效率和总体能量转换效率的峰值分别实现约56.4%和69.4%的增长。在特定周期波浪作用下,额外空气透平的引入还使得一体化系统的总电功率输出的峰值提升约66.57%。结果还表明,双空气透平的增效机理在于可以更有效地调整气室内外空气压差与空气流量,优化气室内的气动阻尼,从而实现波浪能的高效俘获与转换。
基金Open access funding provided by FCT|FCCN(b-on)the Strategic Research Plan of the Centre for Marine Technology and Ocean Engineering(CENTEC),which is financed by the Portuguese Foundation for Science and Technology(Fundação para a Ciência e Tecnologia-FCT)under contract UIDB/UIDP/00134/2020.
文摘An analytical model of a floating heaving box integrated with a vertical flexible porous membrane placed right next to the box applications to wave energy extraction and breakwater systems is developed under the reduced wave equation.The theoretical solutions for the heave radiating potential to the assigned physical model in the corresponding zones are attained by using the separation of variables approach along with the Fourier expansion.Applying the matching eigenfunction expansion technique and orthogonal conditions,the unknown coefficients that are involved in the radiated potentials are determined.The attained radiation potential allows the computation of hydrodynamic coefficients of the heaving buoy,Power Take-Off damping,and wave quantities.The accuracy of the analytical solution for the hydrodynamic coefficients is demonstrated for different oblique angles with varying numbers of terms in the series solution.The current analytical analysis findings are confirmed by existing published numerical boundary element method simulations.Several numerical results of the hydrodynamic coefficients,power capture,power take-off optimal damping,and transmission coefficients for numerous structural and physical aspects are conducted.It has been noted that the ideal power take-off damping increases as the angle of incidence rises,and the analysis suggests that the ability to capture waves is more effective in shallower waters compared to deeper ones.
基金supported by Swinburne University of Technology Sarawak Campus and Birmingham City University.
文摘Wave energy is a promising form of marine renewable energy that offers a sustainable pathway for electricity generation in coastal regions.Despite Malaysia’s extensive coastline,the exploration of wave energy in Sarawak remains limited due to economic,technical,and environmental challenges that hinder its implementation.Compared to other renewable energy sources,wave energy is underutilized largely because of cost uncertainties and the lack of local performance data.This research aims to identify themost suitable coastal zone in Sarawak that achieves an optimal balance between energy potential,cost-effectiveness,and environmental impact,particularly in relation to infrastructure and regional development.The findings indicate that wave energy generation in Sarawak is technically feasible based on MOGA analysis.Among the studied sites,Bintulu emerged as the most balanced option,with a levelized cost of electricity(LCOE)of 0.778–0.864 USD/kWh and a CO_(2) emission factor as low as 0.019–0.020 CO_(2)/k Wh.Miri,while producing lower emissions than Sematan,recorded a higher LCOE of 1.045 USD/kWh with moderate emissions at 0.029 CO_(2)/kWh.Sematan,characterized by weaker wave conditions and higher installation penalties,resulted in the least favorable outcome,with an LCOE of 3.735 USD/kWh.Bintulu’s strategic location reduces CAPEX requirements,making it the most suitable site for large-scale wave energy deployment in Sarawak.
基金supported by Science foundation Ireland(22/NCF/DR/11309).
文摘The global shift towards sustainable energy has intensified research into renewable sources,particularly wave energy.Pakistan,with its long coastline,holds significant potential for wave energy development.However,identifying optimal locations for wave energy plants involves evaluating complex,multi-faceted criteria.This study employs a multi-criteria group decisionmaking(MCGDM)approach using single-valued neutrosophic numbers(SVNNs)to address both qualitative and quantitative uncertainties inherent in real-world scenarios.To enhance decision quality,we introduce two novel operators:the singlevalued neutrosophic prioritised averaging(SVNPAd)operator and the single-valued neutrosophic prioritised geometric(SVNPGd)operator,both incorporating priority degrees.These tools allow decision-makers to express preferences better and handle ambiguous data.The proposed model is validated through comparative analysis with prior studies and demonstrates improved robustness in site selection.Furthermore,we analyse how variations in priority degrees influence decision outcomes,enabling a more dynamic and tailored decision-making process.Our method contributes a more holistic and adaptive framework for selecting locations for wave energy projects,ultimately supporting informed investments in renewable energy infrastructure and improving energy access in underserved coastal regions.
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。
