Abstract
To take advantage of the high tidal current velocity near the free surface, the horizontal axis turbine is installed, which inevitably causes hydrodynamic characteristics to effect the turbine by the waves. In this article, we established a numerical calculation method for the hydrodynamic load of a horizontal axis turbine under wave-current conditions. Based on the numerical calculation results, the hydrodynamic loads were decomposed and the influence rules of wave parameters and blade tip immersion depth on the hydrodynamic load were obtained. The study found the following: (1) the multi-frequency fluctuations based on the rotation frequency and incident wave frequency occurred in instantaneous values of the axial load coefficients and energy utilization ratios, and the fluctuation amplitude decreased with the increase of the blade tip immersion depth; (2) the fluctuation amplitude, according to rotation frequency, changed less with the increase of wave period and wave height, and was smaller according to wave frequency; (3) the fluctuation amplitude based on wave frequency increased linearly with the increase of wave height and wave period. The research results can provide the basis and reference for the design and engineering application of tidal current power station.
Highlights
Tidal current power can be described as a highly dense, reliable, and predictable renewable energy source
To make full use of the high flow velocity of the water’s surface in actual horizontal axis tide power stations, horizontal axis turbine is generally supported by floating type or fixed carriers from the bottom of the sea toward near the free surface [3]
The turbine faces the effects of water cavitation, free surface, and velocity gradient caused by waves
Summary
Tidal current power can be described as a highly dense, reliable, and predictable renewable energy source. In 2019, Zhang Jisheng [16] carried out a physical model test to explore the velocity change and turbulent characteristics of the wake field of a horizontal axis tidal current turbine under the interaction of waves and flows. Most previous numerical studies that used the blade-element momentum (BEM) model to evaluate the dynamic loading behavior of the horizontal axis tidal current turbine due to surface wave’s effects utilized linear wave theory to estimate the horizontal and vertical wave particle velocities [14,17,18]. The BEM model based on the lift and drag obtained from two-dimensional airfoil cannot be used to analyze complex three-dimensional flow effects, nor can it obtain detailed flow field information It can be seen from the above research that the hydrodynamic problem of horizontal axis turbine under wave-flow condition was mainly studied by a model test. We provided, the reference of hydrodynamic load forecast for the horizontal axis of the turbine under complex condition
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