Experimental study on power characteristics of a horizontal-axis tidal turbine under pitch motion

Mei, Yunlei; Jing, Fengmei; Lu, Qiang; Guo, Bin

doi:10.1016/j.oceaneng.2024.118184

Cited by 2 publications

References 36 publications

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Decomposition and prediction of hydrodynamic loads on a floating counter-rotating tidal turbine under surge motion

Sun,

Miao,

Wang

et al. 2024

Physics of Fluids

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In the actual marine environment, the hydrodynamic characteristics of floating counter-rotating tidal turbines (FCRTTs) are influenced by the motion responses of their carrier platforms. Therefore, accurately analyzing and predicting hydrodynamic loads under the motions of FCRTTs are crucial. In this paper, a fitting formula for hydrodynamic loads of FCRTTs applicable to rotational motion is derived. Then, the effects of surge amplitude, surge frequency, and tip speed ratio on the hydrodynamic loads of an FCRTT are also calculated. It is found that the instantaneous load fluctuation of the rear rotor is more severe than that of the front rotor. However, the average torque of both rotors is similar, which can effectively enhance the operational stability of the FCRTT. Additionally, the hydrodynamic loads are decomposed into average hydrodynamic force, damping force, and added mass force based on the least squares method. A fitting formula for the hydrodynamic loads applicable to different surge conditions is derived, incorporating 11 hydrodynamic coefficients. The results indicate that the damping coefficients nP0 and nT0 play a dominant role in the fluctuation amplitude of the hydrodynamic loads. Finally, an effective and fast prediction model for various hydrodynamic coefficients is successfully established using the three-dimensional radial basis function. The relative errors between the predicted peak values of all performance coefficients and the values calculated using the computational fluid dynamics (CFD) method are within −3.5%. This paper provides important guidance for engineering design and load prediction of FCRTTs. Moreover, the predictive methodology can be extended for application to other single-degree-of-freedom and couple motions.

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Decomposition and prediction of hydrodynamic loads on a floating counter-rotating tidal turbine under surge motion

Sun,

Miao,

Wang

et al. 2024

Physics of Fluids

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Research on hydrodynamic characteristics of a floating horizontal axis tidal turbine considering wave and platform motion

Mei,

Jing,

Wang

et al. 2024

Preprint

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The floating horizontal-axis tidal turbine (FHATT) stands out as the most commercially viable tidal energy device. This paper reviews recent literature on FHATT and summarizes experimental and computational fluid dynamics (CFD) methods employed in FHATT research. Based on this foundation, the coupling effects of wave and platform motion (pitch/roll) on FHATT hydrodynamic performance were investigated through flume experiments and CFD simulations. The variations of the power coefficient (CP) and thrust coefficient (CT) are analyzed under different platform motion periods, amplitudes, wave periods, and wave heights. The results demonstrate that under the coupling of waves and pitch motion, CP and CT exhibit dual-frequency oscillations based on the pitch period, with oscillation amplitudes increasing with both pitch frequency (wave frequency) and pitch amplitude (wave height). Within the working conditions of this study, the maximum mean output power under the coupling of pitch motion and waves increases by 26.1%. The maximum fluctuation amplitude of CP reaches 349.8%. When waves and roll motion are coupled, wave parameters dominate, while the influence of roll motion can be ignored. Moreover, the hydrodynamic fluctuations induced by waves and platform motion can couple with each other. This coupling effect not only amplifies the fluctuation amplitude of hydrodynamic coefficients but also has the potential to offset each other. These findings provide insights into the structural design and system control of FHATT, serving as valuable references for FHATT development.

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Experimental study on power characteristics of a horizontal-axis tidal turbine under pitch motion

Cited by 2 publications

References 36 publications

Decomposition and prediction of hydrodynamic loads on a floating counter-rotating tidal turbine under surge motion

Decomposition and prediction of hydrodynamic loads on a floating counter-rotating tidal turbine under surge motion

Research on hydrodynamic characteristics of a floating horizontal axis tidal turbine considering wave and platform motion

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