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Chao Hu
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

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Journal article
Published: 23 May 2019 in Energies
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Offshore wind power has become an important trend in global renewable energy development. Based on a particle swarm optimization (PSO) algorithm and FAST program, a time-domain coupled calculation model for a floating wind turbine is established, and a combined optimization design method for the wind turbine’s blade is developed in this paper. The influence of waves on the power of the floating wind turbine is studied in this paper. The results show that, with the increase of wave height, the power fluctuation of the wind turbine increases and the average power of the wind turbine decreases. With the increase of wave period, the power oscillation amplitude of the wind turbine increases, and the power of the wind turbine at equilibrium position decreases. The optimal design of the offshore floating wind turbine blade under different wind speeds is carried out. The results show that the optimum effect of the blades is more obvious at low and mid-low wind speeds than at rated wind speeds. Considering the actual wind direction distribution in the sea area, the maximum power of the wind turbine can be increased by 3.8% after weighted optimization, and the chord length and the twist angle of the blade are reduced.

ACS Style

Yong Ma; Aiming Zhang; Lele Yang; Chao Hu; Yue Bai. Investigation on Optimization Design of Offshore Wind Turbine Blades based on Particle Swarm Optimization. Energies 2019, 12, 1972 .

AMA Style

Yong Ma, Aiming Zhang, Lele Yang, Chao Hu, Yue Bai. Investigation on Optimization Design of Offshore Wind Turbine Blades based on Particle Swarm Optimization. Energies. 2019; 12 (10):1972.

Chicago/Turabian Style

Yong Ma; Aiming Zhang; Lele Yang; Chao Hu; Yue Bai. 2019. "Investigation on Optimization Design of Offshore Wind Turbine Blades based on Particle Swarm Optimization." Energies 12, no. 10: 1972.

Journal article
Published: 30 November 2018 in Energies
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For a current turbine fixed on a floating platform, the wave-induced motion responses of the platform change the hydrodynamic performance of the current turbine. In this paper, a numerical simulation method based on commercial computational fluid dynamics software-CFX is established to systematically analyze the turbine loads condition and power output efficiency of the turbine subject to the wave-induced motion. This method works well in terms of 2D hydrodynamic performance analysis and is verified by an experiment. In addition, the method is applied to investigate the hydrodynamic performance of a vertical axis current turbine under forced oscillation by a combining sliding mesh with moving mesh technique. This research mainly focusses on the effects of oscillation frequency and oscillation amplitude on the hydrodynamic performance and the flow field. It is found that a wake flow similar to the Von Karman Vortex Street appears under sway oscillation. Spacing between vortex in the wake flow changes under surge oscillation. The fluctuations of the blade load coefficients can be decomposed into a low frequency part and a high frequency part. The low frequency part is related to the frequency of the forced oscillation, while the high frequency part is a consequence of the rotational frequency of the turbine. The oscillation amplitudes of the turbine load coefficients increase linearly with the growth of oscillation frequency and oscillation amplitude. This paper can provide a useful reference for similar research on the turbine loads condition and power out efficiency of the turbine subject to wave-induced motion. This paper can also provide a reference on the structural design or electronic control of vertical axis current turbines.

ACS Style

Yong Ma; Chao Hu; Yulong Li; Rui Deng. Research on the Hydrodynamic Performance of a Vertical Axis Current Turbine with Forced Oscillation. Energies 2018, 11, 3349 .

AMA Style

Yong Ma, Chao Hu, Yulong Li, Rui Deng. Research on the Hydrodynamic Performance of a Vertical Axis Current Turbine with Forced Oscillation. Energies. 2018; 11 (12):3349.

Chicago/Turabian Style

Yong Ma; Chao Hu; Yulong Li; Rui Deng. 2018. "Research on the Hydrodynamic Performance of a Vertical Axis Current Turbine with Forced Oscillation." Energies 11, no. 12: 3349.

Journal article
Published: 20 November 2018 in Water
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The goal of this manuscript is to investigate the influence of relative distance between the twin rotors on the hydrodynamic performance of the vertical axis twin-rotor tidal current turbine. Computational fluid dynamics (CFD) simulations based on commercial software ANSYS-CFX have been performed to enhance the understanding of interactions between the twin-rotors. The interactions between the twin rotors are known to have increased the power output efficiency as a whole, and it is, therefore, of great significance to undertake deeper research. The simulation results are found to be consistent with similar research results in the literature in some aspects. The simulation results of stand-alone turbine and twin rotors are compared from three different aspects, including blade forces, power output efficiency and wake flow field. The results showed that the cyclic variations tendency of blade force coefficients of twin rotors is close to that of the stand-alone turbine. The average power output efficiency of the twin-rotors system is higher than that of the stand-alone turbine. The interactions between the turbines increase the power output of the twin turbine system as whole in a wide relative distance range. However, smaller relative distance between the twin rotors does not mean a bigger power output efficiency of such a system. The power out efficiency of such a system would decrease when the relative distance between the twin rotors exceeds the critical point. The power output of the twin rotors reaches the peak value when the ratio between the two main axis distance and diameter of the turbine is around 9/4. This research can provide a reference for the design and development of larger tidal power stations.

ACS Style

Yong Ma; Chao Hu; Yulong Li; Lei Li; Rui Deng; Dapeng Jiang. Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine. Water 2018, 10, 1694 .

AMA Style

Yong Ma, Chao Hu, Yulong Li, Lei Li, Rui Deng, Dapeng Jiang. Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine. Water. 2018; 10 (11):1694.

Chicago/Turabian Style

Yong Ma; Chao Hu; Yulong Li; Lei Li; Rui Deng; Dapeng Jiang. 2018. "Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine." Water 10, no. 11: 1694.