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Performance Analysis of the Effects of Microgrooved Surface on A marine current turbine with Underwater Mooring Platform

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China Ocean Engineering 2022年第5期36卷 755-766页

作者： DANG Zhi-gao MAO Zhao-yong SONG Bao-wei YANG Guang-yong School of New Energy Nanjing University of Science and TechnologyJiangyin 214443China School of marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory for Unmanned Underwater Vehicle Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

marine current turbine(MCT),which is designed for the power supply of underwater mooring platform(UMP),is investigated in this *** reduce its flow noise,the microgrooved surface is applied at the suction surface of the turbine *** analyses of the effects of the UMP on MCT with microgrooved surface in different working conditions are *** transient turbulent flow field is obtained by incompressible large eddy simulation(LES),and then the Ffowcs Williams and Hawkings(FW-H)acoustic analogy is adopted to forecast the flow noise generated from the pressure fluctuations and loadings of the UMP shell and MCT blade *** numerical methods are first validated with experimental data and good agreements are ***,the influence of several key parameters on the performance of the MCT is then systematically studied,including interval distance,angle of pitch and angle of *** each case,the hydrodynamic parameters(thrust coefficient,torque coefficient and power coefficient),the vortical structures behind the model and the overall sound pressure level(OASPL)directionality are ***,the noise reduction effect of the microgrooved surface is also *** present investigation could provide an overall understanding for the performance of MCT combined with UMP.

关键词： marine current turbine underwater mooring platform microgrooved surface large eddy simulation flow noise

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Multi-point design optimization of hydrofoil for marine current turbine

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Journal of Hydrodynamics 2014年第5期26卷 807-817页

作者：罗兴锜朱国俊冯建军 Institute of Water Resources and Hydro-electric Engineering Xi’an University of Technology

The comprehensive performance of the marine current turbine is an important issue in the ocean energy development. Its key is the performance of the hydrofoil, which is used to form the turbine blade. A multi-point optimization method of the hydrofoil is proposed in this paper. In this method, the Bezier curve is used to parameterize the hydrofoil. The geometrical parameters are used as variables while the lift-drag ratio and the cavitation performance of the hydrofoil are used as the objective functions. The NSGA-II algorithm is chosen as the optimization algorithm. In order to resolve the difficulty of this high-dimensional multi-objective optimi- zation problem, the conception of the distance metric in the metric space is introduced to unify the lift-drag ratio and the cavitation performance under different working conditions. And then, the above optimization method is applied in the NACA63-815 hydro- foil＇s optimal design under three typical conditions. Finally, the results from the performance comparison of the original and optimi- zed hydrofoils obtained by using the CFD simulation are analyzed in detail. It is indicated that the optimized hydrofoils enjoy a better hydrodynamic performance than the original ones under the three conditions. The feasibility and the theoretical validity of this optimization method are confirmed by the results.

关键词： marine current turbine hydrofoil multi-point optimization metric space NSGA-II algorithm

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基于双质量模型的非线性变速海流发电机最优反馈控制

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Journal of marine Science and Application 2020年第1期19卷 83-95页

作者： Rajae Gaamouche Abdelbari Redouane Imad El harraki Bouchra Belhorma Abdennebi El Hasnaoui Electromechanics Department Mohammadia School of Engineering10000 RabatMorocco Electromechanics Department National Superior School of Mines10000 RabatMorocco National Centre for Energy Sciences and Nuclear Techniques 10000 RabatMorocco

This paper presents a contribution related to the control of nonlinear variable-speed marine current turbine(MCT)without pitch operating below the rated marine current *** that the operation of the MCT can be divided into several operating zones on the basis of the marine current speed,the system control objectives are different for each *** deal with this issue,we develop a new control approach based on a linear quadratic regulator with variable generator *** proposed approach enables the optimization of the rotational speed of the turbine,which maximizes the power extracted by the MCT and minimizes the transient loads on the *** novelty of our study is the use of a real profile of marine current speed from the northern coasts of *** simulation results obtained using MATLAB Simulink indicate the effectiveness and robustness of the proposed control approach on the electrical and mechanical parameters with the variations of marine current speed.

关键词： marine current turbine Two-mass model Tip speed ratio Linearization Optimal control Linear quadratic regulator(LQR)

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