Tidal Turbine Blades: Design and Dynamic Loads Estimation Using CFD and Blade Element Momentum Theory

2011 ◽  
Author(s):  
Ce´line Faudot ◽  
Ole G. Dahlhaug
Keyword(s):  
Wind Turbines ◽  
Operating Conditions ◽  
Dynamic Loads ◽  
Power Coefficient ◽  
Scaled Model ◽  
Blade Element Momentum Theory ◽  
Momentum Theory ◽  
Stage Of Development ◽  
Tidal Turbine ◽  
Blade Element

The interest in tidal power is constantly increasing thanks to its high predictability, the huge potential of tides and the actual need for renewable energy. It explains the emergence of many tidal turbine designs, especially in Europe, often inspired from wind turbines. All of them are at a more or less early stage of development. But because of the high density of water, environmental drag forces are very large compared with wind turbines of the same capacity. Therefore the knowledge acquired by the wind industry is certainly qualitatively useful, but it has to be reconsidered to be applicable to tidal turbines. The aim of the project presented in this paper is to create a 1 MW reference tidal turbine, whose small-scaled model has been tested in the towing tank of Marintek laboratory (Trondheim, Norway). The tests focused on dynamic loads, which are an important reason of failure, and thus will help tidal turbine designers in their work by gaining valuable experience in turbine performance in various operating conditions. The chosen turbine has a horizontal axis and two blades, which have been designed using the blade element momentum theory for a diameter of 20m. This paper states the project issues and the method used to design the blades, from the hydrodynamic properties of the hydrofoils to the computational fluid dynamic analysis. The tests on the small scaled model makes it possible to validate the concept and a comparison between efficiencies obtained analytically, experimentally and with CFD computation has been performed in this paper. The maximum power coefficient experimentally obtained is 0.427, i.e. 1.4% higher than the power coefficient obtained numerically. The blade element momentum theory is then used to estimate the loads on each blade when the rotor is subjected to regular waves of many heights and periods, with the intention of ranking the parameters of importance and introducing a fatigue analysis.

scholarly journals Comparison of synthetic turbulence approaches for blade element momentum theory prediction of tidal turbine performance and loads

2020 ◽  
Vol 145 ◽  
pp. 408-418 ◽  
Author(s):  
Michael Togneri ◽  
Grégory Pinon ◽  
Clément Carlier ◽  
Camille Choma Bex ◽  
Ian Masters
Keyword(s):  
Blade Element Momentum Theory ◽  
Momentum Theory ◽  
Turbine Performance ◽  
Tidal Turbine ◽  
Blade Element

scholarly journals Horizontal Axis Wind Turbine Performance Analysis

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
N. Asmuin ◽  
◽  
Basuno B. ◽  
M.F. Yaakub ◽  
N.A. Nor Salim ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Horizontal Axis Wind Turbine ◽  
Thrust Coefficient ◽  
Blade Element Momentum Theory ◽  
Blade Element Theory ◽  
Momentum Theory ◽  
Turbine Performance ◽  
Blade Element

The present work uses the method of Blade Element Momentum Theory as suggested by Hansen. The method applied to three blade models adopted from Rahgozar S. with the airfoil data used the data provided by Wood D. The wind turbine performance described in term of the thrust coefficient C_T, torque coefficient C_Q and the power coefficient C_p . These three coefficient can be deduced from the Momentum theory or from the Blade element Theory(BET). The present work found the performance coefficient derived from the Momentum theory tent to over estimate. It is suggested to used the BET formulation in presenting these three coefficients. In overall the Blade Element Momentum Theory follows the step by step as described by Hansen work well for these three blade models. However a little adjustment on the blade data is needed. To the case of two bladed horizontal axis wind

Power-Curve Corrections for Horizontal-Axis Wind Turbine by an Improved Blade Element Momentum Theory

2016 ◽  
Vol 33 (3) ◽  
pp. 341-349
Author(s):  
C.-J. Bai ◽  
Y.-C. Shiah
Keyword(s):  
Experimental Data ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Power Curve ◽  
Delay Model ◽  
Horizontal Axis Wind Turbine ◽  
Blade Element Momentum Theory ◽  
Momentum Theory ◽  
Blade Element

AbstractThis paper proposes a correction method to improve the accuracy of traditional blade element momentum theory (BEMT) in predicting the mechanical power and power coefficient of horizontal-axis wind turbine (HAWT) blade. In this paper, the traditional BEMT incorporated with the Viterna-Corrigan (VC) stall/stall-delay model is proposed to improve the accuracy of power-curve prediction, by which its applicability is thus enhanced. For verification of the proposed method, three distinct types of geometries of HAWT blades subjected to different operations are studied with outcomes compared with experimental data. Two different wind turbines developed by National Renewable Energy Laboratory (NREL) were tested at constant rotational speeds in a full-scale wind tunnel to acquire performance data. As a comparative platform, another wind turbine designed by BEMT for this study was also experimented in identical environment but at variable rotational speeds. As expected, the results clearly indicate that the power-curve prediction is effectively improved by the proposed method especially in the stall region when compared with experimental data. Indeed, this study shows that the improved BEMT is an ideal means to accurately predict the power-curve used for designing an optimal HAWT rotor.

scholarly journals Blade element momentum theory for a tidal turbine

2018 ◽  
Vol 169 ◽  
pp. 215-226 ◽  
Author(s):  
C.R. Vogel ◽  
R.H.J. Willden ◽  
G.T. Houlsby
Keyword(s):  
Blade Element Momentum Theory ◽  
Momentum Theory ◽  
Tidal Turbine ◽  
Blade Element

Dynamic Responses of a Floating Tidal Turbine Considering Prescribed Wave-Frequency Motion

2018 ◽  
Author(s):  
Xiaoxian Guo ◽  
Jianmin Yang ◽  
Xin Li ◽  
Wenyue Lu ◽  
Tao Peng ◽  
...  
Keyword(s):  
Response Spectra ◽  
Numerical Approach ◽  
Dynamic Responses ◽  
Dynamic Loads ◽  
Hydrodynamic Coefficients ◽  
Bending Moments ◽  
Momentum Theory ◽  
Tidal Turbine ◽  
Two Peaks ◽  
Blade Element

A numerical model based on blade element momentum theory was developed to investigate the effects of floater motion on the dynamic responses of a floating tidal turbine in this paper. SJTU-FTT, a floating tidal turbine system, was introduced. A simplified numerical approach was proposed, in which the 6-DOF motion of the floater was calculated in frequency domain in advance and then was transferred to the unsteady BEM model as inputs. The hydrodynamic coefficients including (added mass, damping, and RAOs) of the floater were presented. The response spectra of the thrust, torque and blade bending moments on the tidal turbine were discussed. Two peaks in the response spectra can be clearly identified, caused by surge and pitch motion of the floater. It was seen that the dynamic loads considering 6-DOF floater motion were much larger than the results from wave only cases.

The effect of shear web on the dynamic response of a wind turbine blade subjected to actual dynamic load

2021 ◽  
pp. 146442072110152
Author(s):  
Tushar Sharma ◽  
Santanu Choudhury ◽  
V Murari ◽  
KK Shukla
Keyword(s):  
Renewable Energy ◽  
Dynamic Load ◽  
Renewable Energy Sources ◽  
Dynamic Loads ◽  
Wind Loads ◽  
Energy Sources ◽  
Blade Element Momentum Theory ◽  
Momentum Theory ◽  
Crucial Part ◽  
Blade Element

The advent of wind turbines has enabled mankind to utilize renewable energy sources for the development of power. The blade being the most crucial part and the design of the same remains a challenge since it is subjected to dynamic loads due to the rotation of the blade along with unsteady wind velocity. The prediction of the dynamic wind loads acting on the blade is a difficult task and thus this has been analyzed in the present work. Two different approaches have been proposed to predict accurately the variation of the wind loads acting on the rotor using the unsteady blade element momentum theory. The effect of gravity has also been accounted for in computing the response of the structure. The effect of the position of shear web and the number of shear webs on the response of the structure has also been analyzed in the present work.

A New Multi-Objective Evolutionary Algorithm for Optimizing the Aerodynamic Design of HAWT Rotor

2014 ◽  
Author(s):  
Ekhlas M. Alfayyadh ◽  
Sadeq H. Bakhy ◽  
Yasir M. Shkara
Keyword(s):  
Genetic Algorithm ◽  
Aerodynamic Performance ◽  
Power Coefficient ◽  
Aerodynamic Design ◽  
Thrust Coefficient ◽  
Blade Element Momentum Theory ◽  
Multi Objective ◽  
Momentum Theory ◽  
Bem Theory ◽  
Blade Element

This paper presents a new multi-objective evolutionary algorithm (MOEA) for optimum aerodynamic design of horizontal-axis wind turbines (HAWT). The design problem is set to find the blade shape such that optimizing multi-objective at different airfoil profiles. Combined Blade Element Momentum (BEM) theory and two different algorithms (Genetic (GA) and Enumeration) are used. Flow around subsonic airfoils is analyzed using XFOIL software. WINDMEL III wind turbine is selected to improve its aerodynamic performance with different airfoil profiles technique of National Renewable Energy Laboratory (NREL) family. Employing Genetic Algorithm embodied in Blade Element Momentum theory to calculate power, thrust and starting torque coefficients that are the fitness function. Another method, Enumeration method, is used to enhance evolutionary method results. The optimum solution acquired from combination of Genetic Algorithm and Blade Element Momentum theory of three blades configuration increased power coefficient by (25.8 %) and thrust coefficient by (16.6%). Enumeration method results increased power coefficient by (13.8%), while thrust coefficient decreased by (0.2%) from the original design. In general, the evolutionary method of combined GA and BEM theory with different airfoil profiles technique improved the turbine aerodynamic performance, and the results are in good agreement with other published papers.

Sign in / Sign up

Export Citation Format

Share Document