International Journal of Marine Energy最新文献_第3页

A harmonic pressure differential wave energy converter 谐波压差波能变换器

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.05.006

Alessandro Schönborn

引用次数: 3

Parametric FEA modelling of offshore wind turbine support structures: Towards scaling-up and CAPEX reduction 海上风力涡轮机支撑结构的参数化有限元建模:朝着扩大规模和降低资本支出的方向发展

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.05.005

Maria Martinez-Luengo, Athanasios Kolios, Lin Wang

{"title":"Parametric FEA modelling of offshore wind turbine support structures: Towards scaling-up and CAPEX reduction","authors":"Maria Martinez-Luengo, Athanasios Kolios, Lin Wang","doi":"10.1016/j.ijome.2017.05.005","DOIUrl":"10.1016/j.ijome.2017.05.005","url":null,"abstract":"<div><p>Parametric Finite Element Analysis (FEA) modelling is a powerful design tool often used for offshore wind. It is so effective because key design parameters (KDPs) can be modified directly within the python code, to assess their effect on the structure’s integrity, saving time and resources. A parametric FEA model of offshore wind turbine (OWT) support structures (consisting of monopile (MP), soil-structure interaction, transition piece (TP), grouted connection (GC) and tower) has been developed and validated. Furthermore, the different KDPs that impact on the design and scaling-up of OWT support structures were identified. The aim of the analyses is determining how different geometry variations will affect the structural integrity of the unit and if these could contribute to the turbine’s scale-up by either modifying the structure’s modal properties, improving its structural integrity, or reducing capital expenditure (CAPEX). To do so, three design cases, assessing different KDPs, have been developed and presented. Case A investigated how the TP’s and GC’s length influences the structural integrity. Case B evaluated the effect of size and number of stoppers in the TP, keeping a constant volume of steel; and Case C assessed the structure’s response to scour development. It is expected that this paper will provide useful information in the conceptual design and scale-up of OWT support structures, helping in the understanding of how KDPs can affect not only the structure’s health, but also its CAPEX.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.05.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81014431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Multi-rotor tidal stream turbine fence performance and operation 多转子潮流水轮机围栏性能及运行

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.08.005

C.R. Vogel, R.H.J. Willden

{"title":"Multi-rotor tidal stream turbine fence performance and operation","authors":"C.R. Vogel, R.H.J. Willden","doi":"10.1016/j.ijome.2017.08.005","DOIUrl":"10.1016/j.ijome.2017.08.005","url":null,"abstract":"<div><p><span>An embedded Reynolds-Averaged Navier–Stokes blade element actuator disk model is used to investigate the performance of a closely spaced cross-stream fence of four turbines. The </span>flow characteristics<span><span> of such fences are found to be dependent on both the local turbine scale flow problem and the array in channel flow<span> scale problem. The mean fence power is found to be less than that predicted for a single turbine with the same local blockage ratio (ratio of turbine swept area to surrounding flow passage area), but greater than that for a single turbine based on the global blockage ratio of the fence (ratio of total fence swept area to the cross-sectional area of the channel). Cross-fence variation in turbine performance is observed as a result of the differing resistance to bypass flow acceleration around the inboard and outboard turbines and depends on the operating condition of the turbines. Reducing turbine thrust, such as by changing the </span></span>rotational speed<span> of the turbine or by employing a pitch-to-feather power capping mechanism reduces turbine-turbine interactions and turbine performance becomes more uniform across the fence. An approximately 6% increase in the mean fence power can be achieved if a cross-fence differential blade pitch strategy is employed to maximise the lift to drag ratio<span><span> along the majority of the blade span of each of the </span>turbine blades.</span></span></span></p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81065288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Wave energy potential along the southern coast of the Caspian Sea 里海南部海岸的波浪能潜力

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.08.002

Rezvan Alamian , Rouzbeh Shafaghat , Seyed Saeed Hosseini , Amir Zainali

{"title":"Wave energy potential along the southern coast of the Caspian Sea","authors":"Rezvan Alamian , Rouzbeh Shafaghat , Seyed Saeed Hosseini , Amir Zainali","doi":"10.1016/j.ijome.2017.08.002","DOIUrl":"10.1016/j.ijome.2017.08.002","url":null,"abstract":"<div><p>We have investigated wave energy potential near the coast of northern Iran. Our main goal, in this study, was to find a suitable location for installing wave energy conversion systems along the southern coast of the Caspian Sea, within Iran's territorial waters, based on the data obtained from ECMWF (European Centre for Medium-Range Weather Forecasts) between 1999 and 2013. We plotted annual and seasonal diagrams of wave height, period, and energy at 17 different locations. We observed that, despite some minor fluctuations, wave energy generally reaches its peak value in autumn. Based on the analyzed data, we suggest that cities of Noshahr and Babolsar are suitable locations for installation of wave energy conversion systems. We further studied wave roses nearby the aforementioned cities. We found that strongest waves occur in South-southeast (SSE) direction with the maximum magnitude of 8.37 and 9.67Mwh (per unit length of the wave front) at Babolsar and Noshahr, respectively. Finally based on our study, we suggest an optimal range of significant wave height and period for designing an efficient wave energy converter in these areas.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.08.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82819872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

Non-linear modelling of a heaving point absorber: The surge effect 升沉点减震器的非线性建模:喘振效应

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.07.002

A. M. Miquel , A. Antonini , R. Archetti , S. Bozzi , A. Lamberti

{"title":"Non-linear modelling of a heaving point absorber: The surge effect","authors":"A. M. Miquel , A. Antonini , R. Archetti , S. Bozzi , A. Lamberti","doi":"10.1016/j.ijome.2017.07.002","DOIUrl":"10.1016/j.ijome.2017.07.002","url":null,"abstract":"<div><p>This paper presents a numerical model that simulates the behaviour of an offshore point absorber wave energy converter (WEC). The model receives 1st order irregular waves as input and delivers instantaneous displacements, velocities and power as output. The model outputs are strongly non-linear due to the nature of some parts of the device, such as the power take off system (PTO), the mooring wires and the drag forces exerted on the wet bodies.</p><p>Two different devices are modelled, a two-body device consisting in a floating buoy attached to a linear generator placed at the sea bed and a three-body device, which also includes a submerged sphere located halfway from the float and the generator. For each device, the model takes into account either the heave mode only or the heave and surge modes combined.</p><p>The devices have been tuned to the Mediterranean wave climate, taking particular attention to the floater dimensions and to the geometrical design of the PTO, which has been redesigned to adapt to the newly introduced surge conditions.</p><p>For the two-body device, although the dynamic behaviour changes when the surge is included, no relevant differences are observed regarding the power production. When studying the three-body device, results show two clear trends. For high waves, the surge leads to a decrease in the production, whereas for smaller waves it affects positively the power absorption. Overall, the negative contribution is more relevant but also less frequent, leading to no substantial change in the power production.</p><p>Including the surge mode in the model does not give significant variations in production rates and therefore, may be neglected only for energy production assessment. However, it should always be taken into account at the design stage.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76122496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Idealized design parameters of Wave Energy Converters in a range of ocean wave climates 波浪能转换器在各种海浪气候条件下的理想设计参数

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.03.003

S.J. Illesinghe , R. Manasseh , R. Dargaville , A. Ooi

引用次数: 21

Tidal resource and interactions between multiple channels in the Goto Islands, Japan 日本后藤群岛的潮汐资源和多渠道间的相互作用

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.09.002

S. Waldman , S. Yamaguchi , R. O’Hara Murray , D. Woolf

引用次数: 15

The influence of scale on the air flow and pressure in the modelling of Oscillating Water Column Wave Energy Converters 振荡水柱波能转换器模型中尺度对气流和压力的影响

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.08.004

Aggelos S. Dimakopoulos , Mark J. Cooker , Tom Bruce

{"title":"The influence of scale on the air flow and pressure in the modelling of Oscillating Water Column Wave Energy Converters","authors":"Aggelos S. Dimakopoulos , Mark J. Cooker , Tom Bruce","doi":"10.1016/j.ijome.2017.08.004","DOIUrl":"10.1016/j.ijome.2017.08.004","url":null,"abstract":"<div><p>In this work, air compressibility effects are investigated during wave interaction with an Oscillating Water Column (OWC) Wave Energy Converter (WEC). Mathematical modelling includes a thermodynamic equation for the air phase and potential flow equations for the water phase. A simple three dimensional OWC geometry with a linear Power Take Off (PTO) response is considered and both the thermodynamic and potential flow equations are linearised. Analysis of the linearised system of equations reveals a nondimensional coefficient which we name “compression number”. The flow potential is decomposed into scattering and radiation components, using an analogue of spring-dashpot response and taking into account the additional effects of air compressibility to wave interaction processes. We use these concepts to characterise the relative importance of the air compressibility effects inside the OWC and to derive novel scaling relations for further investigation of scaling effects in OWC physical modelling. The predictions of the methodology are validated against large scale experimental data, where compressibility effects are evident and further application of the methodology to a realistic OWC geometry is used to demonstrate the importance of these effects to prototype scale.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.08.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75388549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Understanding the potential risk to marine mammals from collision with tidal turbines 了解与潮汐涡轮机碰撞对海洋哺乳动物的潜在风险

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.07.004

Andrea Copping , Molly Grear , Richard Jepsen , Chris Chartrand , Alicia Gorton

{"title":"Understanding the potential risk to marine mammals from collision with tidal turbines","authors":"Andrea Copping , Molly Grear , Richard Jepsen , Chris Chartrand , Alicia Gorton","doi":"10.1016/j.ijome.2017.07.004","DOIUrl":"10.1016/j.ijome.2017.07.004","url":null,"abstract":"<div><p>Many marine mammal populations worldwide are in decline due to stresses from climate change and interactions with anthropogenic activities such as fishing, coastal construction petroleum extraction, and commercial shipping. The advent of the marine renewable energy industry has raised questions, particularly for tidal turbines. However, it is technically very difficult to observe close interactions of marine mammals and underwater turbines, and the likelihood of viewing a rare event such as a collision, is very small. This research seeks to understand the potential risk to a marine mammal from the presence of a tidal turbine by examining the sequence of behavioral events that could lead to a potential collision with the turbine, and the likely consequences to the marine mammal if such a collision were to occur. We examine this potential risk within the context of the physical environment into which a turbine might be deployed, and the attributes of one tidal device, and investigate the biomechanical properties of a marine mammal that may allow the animal to resist injury from a tidal blade collision. The data examined in this research (likelihood of a marine mammal being in close proximity to a tidal turbine, biomechanics of marine mammal tissues, and engineering models) provide insight into the interaction.</p></div>","PeriodicalId":100705,"journal":{"name":"International Journal of Marine Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ijome.2017.07.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85185489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Forces on a marine current turbine during runaway 失控过程中对海流涡轮机的作用力

International Journal of Marine Energy Pub Date : 2017-09-01 DOI: 10.1016/j.ijome.2017.09.007

Anders Goude, Staffan Lundin

引用次数: 5