Performance analysis of a vertical axis tidal turbine with flexible blades

2017 ◽  
Vol 16 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Mohamed Taher Bouzaher ◽  
Belhi Guerira ◽  
Mohamed Hadid
Keyword(s):  
Performance Analysis ◽  
Vertical Axis ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine

scholarly journals Wake of a Ducted Vertical Axis Tidal Turbine in Turbulent Flows, LBM Actuator-Line Approach

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4273 ◽  
Author(s):  
Mikaël Grondeau ◽  
Sylvain Guillou ◽  
Philippe Mercier ◽  
Emmanuel Poizot
Keyword(s):  
Turbulent Flows ◽  
Vertical Axis ◽  
Tidal Currents ◽  
Eddy Simulation ◽  
Tidal Turbines ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine ◽  
Ambient Turbulence ◽  
The Cost ◽  
Boltzmann Method

Vertical axis tidal turbines are devices that extract the kinetic energy from tidal currents. Tidal currents can be highly turbulent. Since ambient turbulence affects the turbine hydrodynamic, it is critical to understand its influence in order to optimize tidal farms. Actuator Line Model (ALM) combined with Large Eddy Simulation (LES) is a promising way to comprehend this phenomenon. In this article, an ALM was implemented into a Lattice Boltzmann Method (LBM) LES solver. This implementation gives good results for predicting the wake of a vertical axis tidal turbine placed into a turbulent boundary layer. The validated numerical configuration was then used to compute the wake of a real size ducted vertical axis tidal turbine. Several upstream turbulence rates were simulated. It was found that the shape of the wake is strongly influenced by the ambient turbulence. The cost-to-precision ratio of ALM-LBM-LES compared to fully resolved LBM-LES makes it a promising way of modeling tidal farms.

CFD simulation of fixed and variable pitch vertical axis tidal turbine

2013 ◽  
Vol 12 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Qihu Sheng ◽  
Syed Shah Khalid ◽  
Zhimin Xiong ◽  
Ghazala Sahib ◽  
Liang Zhang
Keyword(s):  
Cfd Simulation ◽  
Vertical Axis ◽  
Variable Pitch ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine

Effect of Diagonal Layout on Efficiency of Twin Vertical Axis Turbine

2013 ◽  
Vol 773 ◽  
pp. 203-206
Author(s):  
Ke Sun ◽  
Shah Khalid Syed ◽  
Liang Zhang ◽  
Sahib Ghazala
Keyword(s):  
Vertical Axis ◽  
Maximum Efficiency ◽  
Incoming Flow ◽  
Tidal Current Energy ◽  
Ansys Cfx ◽  
Tidal Turbine ◽  
Vertical Axis Turbine ◽  
Current Flows ◽  
Vertical Axis Tidal Turbine ◽  
Current Energy

Vertical axis turbine is one of the tools used to extract tidal current energy. The purpose of this study is to show the effect of diagonal layout on the efficiency of vertical axis tidal turbine (VATT), using commercial software ANSYS CFX. For this purpose the angle between the incoming current flows is varied while the distance between the turbines is kept constant. The layout is observed at an angle of 200, 300, 450, 600and 900. From study we observed that when the twin turbines are at angle of 900to the incoming flow, the turbines have maximum efficiency.

A Study of Modified Vertical Axis Tidal Turbine to Improve Lift Performance

2016 ◽  
Vol 4 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Nu Rhahida Arini ◽  
◽  
Stephen R. Turnock ◽  
Mingyi Tan
Keyword(s):  
Vertical Axis ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine

Mechanism Design and Modal Analysis of Vertical-Axis Tidal Turbine

2013 ◽  
Vol 572 ◽  
pp. 433-436
Author(s):  
Wen De Zhao ◽  
Yi Li ◽  
Yan Tao Li
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Vertical Axis ◽  
Resonance Phenomenon ◽  
Mode Shapes ◽  
Software Analysis ◽  
Input Shaft ◽  
Finite Element Software ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine

A vertical-axis tidal turbine was designed in the paper. Modal analysis of the vertical-axis tidal turbine was investigated based finite element software analysis method. Finite element simulation model for modal analysis of the accelerator and the whole tidal turbine were built by appropriate structure simplification. And, the anterior 10 ranks of natural frequencies and corresponding mode shapes were calculated. Modal analysis results show that the natural frequency of the turbine away from the frequencies of tidal current incentive, impeller incentive and generator rotor incentive, so the resonance phenomenon does not exist in the turbine of the paper. Also, the modal analysis results show that the input of the accelerator and leaves of impeller have a large deformation, and the stiffness of the input shaft and spokes and leaves of impeller should be increased.

scholarly journals An Unsteady Boundary Element Model for Hydrodynamic Performance of a Multi-Blade Vertical-Axis Tidal Turbine

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1413 ◽  
Author(s):  
Guangnian Li ◽  
Qingren Chen ◽  
Hanbin Gu
Keyword(s):  
Boundary Element ◽  
Numerical Solutions ◽  
Vertical Axis ◽  
Element Model ◽  
Hydrodynamic Performance ◽  
Design And Optimization ◽  
Tidal Turbines ◽  
Proposed Model ◽  
Tidal Turbine ◽  
Vertical Axis Tidal Turbine

An unsteady boundary element model is developed to simulate the unsteady flow induced by the motion of a multi-blade vertical axis turbine. The distribution of the sources, bound vortices and wake vortices of the blades are given in detail. In addition, to make the numerical solution more robust, the Kutta condition is also introduced. The developed model is used to predict the hydrodynamic performance of a vertical axis tidal turbine and is validated by comparison with experimental data and other numerical solutions available in the literature. Good agreement is achieved and the calculation of the proposed model is simpler and more efficient than prior numerical solutions. The proposed model shows its capability for future profile design and optimization of vertical axis tidal turbines.

Numerical Simulation of Blade-Wake Interaction of Vertical Axis Tidal Turbine

2011 ◽  
Vol 346 ◽  
pp. 318-323 ◽  
Author(s):  
Zhi Chuan Li ◽  
Qi Hu Sheng ◽  
Liang Zhang ◽  
Zhi Ming Cong ◽  
Jin Jiang
Keyword(s):  
Numerical Simulation ◽  
Vortex Method ◽  
Vertical Axis ◽  
Continuous Phase ◽  
Momentum Equation ◽  
Element Analysis ◽  
Wake Interaction ◽  
Tidal Turbine ◽  
Sst Turbulence Model ◽  
Vertical Axis Tidal Turbine

To study the blade-wake interaction of vertical axis tidal turbine (VATT)，particles were placed in the flow field to trace blade wake during numerical simulation. Numerical simulations were conducted utilizing Euler-Lagrange model. In the simulations, the continuous phase was solved by Reynolds-averaged Navier-Stocks(RANS) equation combined with SST turbulence model and the particle trajectories of the dispersed phase were determined by momentum equation. Numerical results of predicting instantaneous blade forces and blade wakes showed good agreement with the test data. The model was also compared with previous classic free vortex model (V-DART), vortex method combined with finite element analysis (FEVDTM) and 2-D vortex panel model (VPM2D). It showed that the present model was much better than the former.

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