Structural Dynamic Analysis of a Tidal Current Turbine Using MBDyn

2018 ◽  
Author(s):  
Jun Leng ◽  
Ye Li
Keyword(s):  
Tidal Current ◽  
Interaction Analysis ◽  
Vertical Axis ◽  
Internal Force ◽  
Mode Shapes ◽  
Structural Dynamic ◽  
Tidal Current Energy ◽  
Integrated Simulation ◽  
Tidal Current Turbine ◽  
Current Turbine

In recent years, tidal current energy has gained wide attention for its abundant resource and environmentally friendly production. This study focuses on analyzing dynamic behavior of a three-bladed vertical axis tidal current turbine. The multibody dynamics code MBDyn is used in the numerical simulation. It performs the integrated simulation and analysis of nonlinear mechanical, aeroelastic, hydraulic and control problems by numerical integration. In this study, tidal current turbine is idealized as an assembly of flexible beams including axis of rotation, arms and blades. We firstly conduct a modal analysis on the tidal current turbine and validate the model with the results obtained by ANSYS. The natural frequencies of blades with different size parameters are compared and the corresponding mode shapes are presented. Next, a parametric study was performed to investigate the effect of internal force on the dynamic response. It is concluded that the proposed method is accurate and efficient for structural analysis of tidal current turbine and this flexible multibody model can be used in the fluid-structure-interaction analysis in the future.

Numerical study on energy-converging efficiency of the ducts of vertical axis tidal current turbine in restricted water

2020 ◽  
Vol 210 ◽  
pp. 107320 ◽  
Author(s):  
Wang Hua-Ming ◽  
Qu Xiao-Kun ◽  
Chen Lin ◽  
Tu Lu-Qiong ◽  
Wu Qiao-Rui
Keyword(s):  
Tidal Current ◽  
Numerical Study ◽  
Vertical Axis ◽  
Tidal Current Turbine ◽  
Current Turbine

Comparison of Tidal Current Turbine Designs in Several High Speed Locations Around the United States

2015 ◽  
Author(s):  
Mohammed S. Mayeed ◽  
Golam M. Newaz ◽  
Dallin Hall ◽  
Davison Elder
Keyword(s):  
United States ◽  
Power Generation ◽  
Gulf Stream ◽  
Tidal Current ◽  
The United States ◽  
Simulation Software ◽  
Tidal Current Energy ◽  
Tidal Current Turbine ◽  
Current Energy ◽  
Current Turbine

Tidal current energy is regarded as one of the most promising alternative energy resources for its minimal environmental footprint and high-energy density. The device used to harness tidal current energy is the tidal current turbine, which shares similar working principle with wind turbines. The high load factors resulting from the fluid properties and the predictable resource characteristics make marine currents particularly attractive for power generation. There is a paucity of information regarding various key aspects of system design encountered in this relatively new area of research. Not much work has been done to determine the characteristics of turbines running in water for kinetic energy conversion even though relevant work has been carried out on ship’s propellers, wind turbines and on hydro turbines. None of these three well established areas of technology completely overlap with this new field so that gaps remain in the state of knowledge. A tidal current turbine rated at 1–3 m/s in water can result in four times as much energy per year/m2 of rotor swept area as similarly rated power wind turbine. Areas with high marine current flows commonly occur in narrow straits, between islands, and around. There are many sites worldwide with current velocities around 2.5 m/s, such as near the UK, Italy, the Philippines, and Japan. In the United States, the Florida Current and the Gulf Stream are reasonably swift and continuous currents moving close to shore in areas where there is a demand for power. In this study tidal current turbines are designed for several high tidal current areas around USA for a tidal current speed range from 1 m/s to 2.5 m/s. Several locations around USA are considered, e.g. the Gulf Stream; Mississippi River, St. Clair’s river connecting Lake Huron to Lake St. Clair’s; Colorado River within Cataract Canyon etc. Tidal current turbines can be classified as either horizontal or vertical axis turbines. In this study several designs from both the classifications are considered and modeled using SolidWorks. Hydrodynamic analysis is performed using SolidWorks Flow simulation software, and then optimization of the designs is performed based on maximizing the starting rotational torque and ultimate power generation capacity. From flow simulations, forces on the tidal current turbine blades and structures are calculated, and used in subsequent stress analysis using SolidWorks Simulation software to confirm structural integrity. The comparative results from this study will help in the systematic optimization of the tidal current turbine designs at various locations.

Preliminary Results of a Vortex Method for Stand-Alone Vertical Axis Marine Current Turbine

2007 ◽  
Author(s):  
Ye Li ◽  
Sander M. Calisal
Keyword(s):  
Wind Turbine ◽  
Tidal Current ◽  
Vortex Method ◽  
Vertical Axis ◽  
Small Scale ◽  
Discrete Vortex ◽  
Analysis And Design ◽  
Tidal Turbine ◽  
Tidal Current Turbine ◽  
Current Turbine

Tidal power technology has been dwarfed once to take hold in the late 1970’s, because the early generations were expensive at small scale and some applications (such as barrages) had negative environmental impacts. In a similar working manner as a wind turbine, a tidal current turbine has been recognized as a promising ocean energy conversion device in the past two decades. However, the industrialization process is still slow. One of the important reasons is lack of comprehensive turbine hydrodynamics analysis which can not only predict turbine power but also assess impacts on the surrounding areas. Although a lot can be learned from the marine propeller or the wind turbine studies, a systematic hydrodynamics analysis on a vertical axis tidal current turbine has not been reported yet. In this paper, we employed vortex method to calculate the performance of stand-alone vertical axis tidal turbine in term of power efficiency, torque and forces. This method focuses on power prediction, hydrodynamics analysis and design, which can provide information for turbines distribution planning in a turbine farm and other related studies, which are presented in Li and Calisal (2007), a companion paper in the conference. In this method, discrete vortex method is the core for numerical calculation. Free vortex wake structure, nascent vortex and vortex decay mechanism are discussed in detail. Good agreements in turbine efficiency comparison are obtained with both the newly-designed tidal turbine test in a towing tank and early wind turbine test.

scholarly journals Theoretical vertical-axis tidal-current-turbine wake model using axial momentum theory with CFD corrections

2018 ◽  
Vol 79 ◽  
pp. 113-122 ◽  
Author(s):  
Yanbo Ma ◽  
Wei Haur Lam ◽  
Yonggang Cui ◽  
Tianming Zhang ◽  
Jinxin Jiang ◽  
...  
Keyword(s):  
Tidal Current ◽  
Vertical Axis ◽  
Momentum Theory ◽  
Tidal Current Turbine ◽  
Wake Model ◽  
Turbine Wake ◽  
Current Turbine

scholarly journals The influence of time step setting on the CFD simulation result of vertical axis tidal current turbine

2018 ◽  
Vol 12 (1) ◽  
pp. 3399-3409 ◽  
Author(s):  
Dendy Satrio ◽  
◽  
I Ketut Aria Pria Utama ◽  
Mukhtasor M ◽  
◽  
...  
Keyword(s):  
Tidal Current ◽  
Cfd Simulation ◽  
Vertical Axis ◽  
Time Step ◽  
Tidal Current Turbine ◽  
Current Turbine

Investigations Into Tidal Current Turbine System Faults and Fault Tolerant Control Strategies

2020 ◽  
Author(s):  
Xuhua Yan ◽  
Rosemary Norman ◽  
Mohammed A. Elgendy
Keyword(s):  
Tidal Current ◽  
Fault Tolerant ◽  
Control Strategies ◽  
Synchronous Generator ◽  
Fault Tolerant Control ◽  
Current Speed ◽  
Tidal Current Energy ◽  
Speed Sensor ◽  
Tidal Current Turbine ◽  
Current Turbine

Abstract In recent years, there has been a growing interest in tidal current energy as it is a potential source for green electricity generation and the most predictable form of ocean renewable energy. Due to the harsh marine environment, the Tidal Current Turbine (TCT) system has to be designed to be robust and to work reliably with high availability to minimize the need for intervention. Thus, fault tolerant control strategies are needed to enable the system to continue operating under some fault conditions, this will reduce the power generation cost and also increase the system robustness. This paper introduces some of the different fault conditions that may occur in TCT systems such as sensor faults, especially tidal current sensors. Potential solutions for these faults are then introduced. The paper then presents a standalone TCT generation system model with perturb and observe (P&O) control; this control aims to solve the tidal current speed sensor fault problem, ensuring that the system operates near the maximum power point (MPP) without the tidal current speed sensor. The control system is simulated using MATLAB/Simulink, for a TCT, utilizing a permanent synchronous generator (PMSG) and a boost converter.

Numerical and experimental study of the 3D effect on connecting arm of vertical axis tidal current turbine

2015 ◽  
Vol 30 (1) ◽  
pp. 83-96 ◽  
Author(s):  
Wei Guo ◽  
Hai-gui Kang ◽  
Bing Chen ◽  
Yu Xie ◽  
Yin Wang
Keyword(s):  
Experimental Study ◽  
Tidal Current ◽  
Vertical Axis ◽  
Tidal Current Turbine ◽  
3D Effect ◽  
Current Turbine

scholarly journals Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1694 ◽  
Author(s):  
Yong Ma ◽  
Chao Hu ◽  
Yulong Li ◽  
Lei Li ◽  
Rui Deng ◽  
...  
Keyword(s):  
Power Output ◽  
Tidal Current ◽  
Vertical Axis ◽  
Hydrodynamic Performance ◽  
Relative Distance ◽  
Output Efficiency ◽  
Simulation Results ◽  
Tidal Current Turbine ◽  
Current Turbine ◽  
Twin Rotor

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.

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