Volume 10: Ocean Renewable Energy最新文献_第5页

Dynamic Response of Spar-Type Floating Offshore Wind Turbine in Freak Wave 桅杆式浮式海上风力机在异常波浪中的动力响应

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-95638

You-gang Tang, Yan Li, Xie Peng, X. Qu, Wang Bin

引用次数: 0

Wave-Powered AUV Recharging: A Feasibility Study 波浪动力水下航行器充电:可行性研究

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-95383

Blake P. Driscol, A. Gish, R. Coe

引用次数: 3

The Influence of Tidal Unsteadiness on a Tidal Turbine Blade Flow-Induced Vibration 潮汐非定常对潮汐涡轮机叶片流激振动的影响

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-96007

N. Arini, S. Turnock, M. Tan

{"title":"The Influence of Tidal Unsteadiness on a Tidal Turbine Blade Flow-Induced Vibration","authors":"N. Arini, S. Turnock, M. Tan","doi":"10.1115/omae2019-96007","DOIUrl":"https://doi.org/10.1115/omae2019-96007","url":null,"abstract":"\u0000 The influence of unsteady tidal flow on the flow-induced vibration of a vertical axis tidal turbine blade is investigated numerically in this paper. A 2D CFD model is developed to simulate the blade flow-induced vibration in OpenFoam. The vibration is caused by dynamic loading from the unsteady tide. It is recognized that the unsteady tidal current mainly comes from the changes in tidal velocity magnitude and angle of attack experienced by a tidal turbine blade as it rotates. This paper studies numerically how velocity magnitude and initial angle of attack influence tidal turbine blade vibrations and the effects of the velocity and angle of attack are evaluated separately where the unsteadiness parameters are varied around a set of environmental condition. The vibration is examined through time histories of blade displacement, pressure distribution on the blade surface and the tidal current regime. The blade is assumed to have pitch and heave responses thus the vibration is in the form of transverse and torsional vibrations. The results show that increasing tidal velocity magnitude strengthens the torsional vibration. The increase of angle of attack is likely to generate chaotic motions and enhance both transverse and torsional vibrations.","PeriodicalId":306681,"journal":{"name":"Volume 10: Ocean Renewable Energy","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114396612","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: 0

Experimental Study on Coupled Motions of a Spar-Buoy Under Mathieu Instability Mathieu失稳条件下桅杆浮标耦合运动的实验研究

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-95937

T. Iseki, Peng Xu

引用次数: 4

Aeromechanical Analysis of Wind Turbines Using Non-Linear Harmonic Method 基于非线性谐波法的风力机气动力学分析

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-96256

S. W. Naung, M. Rahmati, H. Farokhi

{"title":"Aeromechanical Analysis of Wind Turbines Using Non-Linear Harmonic Method","authors":"S. W. Naung, M. Rahmati, H. Farokhi","doi":"10.1115/omae2019-96256","DOIUrl":"https://doi.org/10.1115/omae2019-96256","url":null,"abstract":"\u0000 In this paper, aeromechanical analysis of wind turbines is presented. The distinctive feature of this paper is the use of frequency based non-linear harmonic method which is an efficient computational method to study unsteady periodic flow and aeroleasticity of turbomachinery applications, and extensive validation of the non-linear harmonic method against conventional time domain solution methods. This paper is an extension of the authors’ previous work which analysed the aerodynamics of the MEXICO (Model Rotor Experiments In Controlled Conditions) Experiment wind turbine. Aeromechanical analysis of the MEXICO-Experiment wind turbine as well as 1.5 MW wind turbine are conducted in this study. Both conventional time domain solution method and non-linear harmonic method are used, and compared to each other for validation and verification of the non-liner harmonic method. Using the same numerical set-up for each method demonstrates the differences and capabilities of each solution method, and their computational expenses. Finally, this paper concludes with how the aeromechanical analysis of large wind turbines can be performed effectively and efficiently using the non-linear harmonic method.","PeriodicalId":306681,"journal":{"name":"Volume 10: Ocean Renewable Energy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129082884","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: 9

Geometrical Optimization of U-Oscillating Water Columns in Random Waves 随机波浪中u形振荡水柱的几何优化

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-95973

A. Scialò, G. Malara, F. Arena

{"title":"Geometrical Optimization of U-Oscillating Water Columns in Random Waves","authors":"A. Scialò, G. Malara, F. Arena","doi":"10.1115/omae2019-95973","DOIUrl":"https://doi.org/10.1115/omae2019-95973","url":null,"abstract":"\u0000 This paper deals with the problem of designing an optimal U - Oscillating Water Column (U-OWC) device equipped with a Wells turbine. Specifically, the paper proposes the implementation of a genetic algorithm for designing a U-OWC exposed to the typical sea states available in the Mediterranean Sea. The first challenge encountered in this problem is the efficient calculation of the U-OWC hydrodynamic parameters. The second challenge relates to the fact that the U-OWC dynamics is governed by two coupled nonlinear ordinary differential equations with no closed-form solution. For reducing the computational cost, the genetic algorithm is combined with a semi-analytical approach used for determining the U-OWC hydrodynamic parameters and with a statistical linearization based approximate solution of the equations governing the U-OWC dynamics. Such a procedure allows estimating efficiently, albeit approximately, the power output of the system.\u0000 Numerical results compare a design based on a conventional “design sea state” vis-à-vis a design based on a “design wave climate”. For this purpose, the case study of the Roccella Jonica marina (Reggio Calabria, Italy) is considered, as relevant wave data are available to characterize the most energetic seas as well as depicting the global wave climate available at that location. The numerical results highlight the fact that an optimization conducted on the basis of a design sea state does not lead to an optimal design in a wave climate.","PeriodicalId":306681,"journal":{"name":"Volume 10: Ocean Renewable Energy","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127000250","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: 5

Performance of a Passive Tuned Liquid Column Damper for Floating Wind Turbines 浮式风力发电机被动调谐液柱阻尼器性能研究

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-96360

Wei Yu, F. Lemmer, P. Cheng

引用次数: 5

Oscillating Water Column Motion Inside Circular Cylindrical Structures 圆柱结构内的振荡水柱运动

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-96048

Daniel de Oliveira Costa, Joel Sena Sales Junior, A. C. Fernandes

{"title":"Oscillating Water Column Motion Inside Circular Cylindrical Structures","authors":"Daniel de Oliveira Costa, Joel Sena Sales Junior, A. C. Fernandes","doi":"10.1115/omae2019-96048","DOIUrl":"https://doi.org/10.1115/omae2019-96048","url":null,"abstract":"\u0000 A non-linear mathematical model is presented for the Equation of Motion of the Water Column inside circular cylindrical structures in different cases, comparing to previous models in literature. Experimental model tests were carried out investigating the water column decay under given initial conditions, and an analysis is performed for each cycle showing the dynamic behaviour of OWC evolving in time. The results show asymmetric pattern in the time series acquired in the decay tests as a consequence of variations of the Added Length and quadratic viscous damping as the direction of the flow changes, as observed in previous studies.\u0000 A general procedure is proposed to assess the unknown parameters including the quadratic damping viscous coefficients through the concept of “equivalent linear harmonic” as a linearisation of such terms, enlightening its dependence on the motion amplitude as well as the water column draft.\u0000 Experimental data for the OWC response under a set of incoming regular waves is also presented, comparing the results to numerical simulation through a solver based on the estimation of the damping coefficients obtained in the decay tests.","PeriodicalId":306681,"journal":{"name":"Volume 10: Ocean Renewable Energy","volume":" 67","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132187703","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: 1

Effects of Platform Mounting Orientations on the Long-Term Performance of a Semisubmersible Wind Turbine 平台安装方向对半潜式风力机长期性能的影响

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/omae2019-96240

Shengtao Zhou, Chao Li, Yiqing Xiao, F. Lemmer, Wei Yu, P. Cheng

{"title":"Effects of Platform Mounting Orientations on the Long-Term Performance of a Semisubmersible Wind Turbine","authors":"Shengtao Zhou, Chao Li, Yiqing Xiao, F. Lemmer, Wei Yu, P. Cheng","doi":"10.1115/omae2019-96240","DOIUrl":"https://doi.org/10.1115/omae2019-96240","url":null,"abstract":"\u0000 Due to the non-fully-symmetrical configuration, the platform laying angle of semi-submersible floating offshore wind turbines relative to wind/wave load directions has a noticeable influence on the dynamics characteristics of the whole structure, which indicates that the platform mounting orientation should be carefully considered before installation at sea. The directionality effects of short-term wind/wave loads had been discussed in previous studies, which are, however, insufficient to make a full understanding of the directionality impacts. In our study, based on a 25-year met-ocean database, long-term analysis is carried out by means of an efficient frequency-domain model with eight degrees of freedom. The nonlinear quantities such as aerodynamic loads, aerodynamic damping and mooring stiffness are derived from the time-domain simulation tool FAST, serving as a preprocessing database for the frequency-domain model. A case study is carried out by comparing the long-term responses of a Y-shape semi-submersible floating wind turbine in four mounting orientations. Significant differences can be seen. The platform mounted in the most unfavorable orientation tends to suffer from larger peak nacelle acceleration, which would increase the loads and cause higher tower base fatigue damage. These findings highlight the importance of platform mounting orientations and can serve as a basis for the installation of semi-submersible floating wind turbines.","PeriodicalId":306681,"journal":{"name":"Volume 10: Ocean Renewable Energy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130900557","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: 0

Impact of Simulation Duration for Offshore Floating Wind Turbine Analysis Using a Coupled FAST-OrcaFlex Model 基于FAST-OrcaFlex耦合模型的海上浮式风力机仿真持续时间影响分析

Volume 10: Ocean Renewable Energy Pub Date : 2019-11-11 DOI: 10.1115/OMAE2019-95159

A. Pillai, P. Thies, L. Johanning

引用次数: 2