Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation

Morris, Ceri; O'Doherty, Daphne Maria; O'Doherty, Timothy; Mason-Jones, Allan

doi:10.1016/j.renene.2015.10.037

Cited by 21 publications

(13 citation statements)

References 6 publications

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“…The solution for this simulation took about 283.3 h (12 days) to complete. Similar, computational time has also been reported by other authors like Kim et al [14] as 10 days and Morris et al [21] as 340 h (14 days) for FSI analysis of the TCT with almost similar setup, computational resources and convergence criteria.…”

Section: Development Of the Fsi Modelsupporting

confidence: 84%

Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment

Badshah

Kadir

2018

Energies

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Tidal Current Turbine (TCT) blades are highly flexible and undergo considerable deflection due to fluid interactions. Unlike Computational Fluid Dynamic (CFD) models Fluid Structure Interaction (FSI) models are able to model this hydroelastic behavior. In this work a coupled modular FSI approach was adopted to develop an FSI model for the performance evaluation and structural load characterization of a TCT under uniform and profiled flow. Results indicate that for a uniform flow case the FSI model predicted the turbine power coefficient C P with an error of 4.8% when compared with experimental data. For the rigid blade Reynolds Averaged Navier Stokes (RANS) CFD model this error was 9.8%. The turbine blades were subjected to uniform stress and deformation during the rotation of the turbine in a uniform flow. However, for a profiled flow the stress and deformation at the turbine blades varied with the angular position of turbine blade, resulting in a 22.1% variation in stress during a rotation cycle. This variation in stress is quite significant and can have serious implications for the fatigue life of turbine blades.

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Section: Development Of the Fsi Modelsupporting

confidence: 84%

Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment

Badshah

Kadir

2018

Energies

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“…Equation (14) depicts the power coefficient, C P,A max as a function of the maximum frontal area of the duct, A max .…”

Section: Cfd Results Of the Ducted Turbinementioning

confidence: 99%

“…The MRF approach is less expensive than the URANS rotating sliding mesh approach, but the rotating sliding mesh approach can lead to more accurate predictions [10,11]. The MRF method is broadly used for analysis of axisymmetric hydrokinetic turbine analysis, especially when the focus is upon blade loading [12][13][14]. Both the MRF and URANS rotating sliding mesh techniques are evaluated using the geometry of a marine current turbine which was tested in a cavitation tunnel and towing tank [15].…”

Section: Introductionmentioning

confidence: 99%

Coupling Numerical Methods and Analytical Models for Ducted Turbines to Evaluate Designs

Knight

Freda²,

Young

et al. 2018

JMSE

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Hydrokinetic turbines extract energy from currents in oceans, rivers, and streams. Ducts can be used to accelerate the flow across the turbine to improve performance. The objective of this work is to couple an analytical model with a Reynolds averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) solver to evaluate designs. An analytical model is derived for ducted turbines. A steady-state moving reference frame solver is used to analyze both the freestream and ducted turbine. A sliding mesh solver is examined for the freestream turbine. An efficient duct is introduced to accelerate the flow at the turbine. Since the turbine is optimized for operation in the freestream and not within the duct, there is a decrease in efficiency due to duct-turbine interaction. Despite the decrease in efficiency, the power extracted by the turbine is increased. The analytical model under-predicts the flow rejection from the duct that is predicted by CFD since the CFD predicts separation but the analytical model does not. Once the mass flow rate is corrected, the model can be used as a design tool to evaluate how the turbine-duct pair reduces mass flow efficiency. To better understand this phenomenon, the turbine is also analyzed within a tube with the analytical model and CFD. The analytical model shows that the duct's mass flow efficiency reduces as a function of loading, showing that the system will be more efficient when lightly loaded. Using the conclusions of the analytical model, a more efficient ducted turbine system is designed. The turbine is pitched more heavily and the twist profile is adapted to the radial throat velocity profile.

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“…Since the operation of SMA strips is based on the relationship between the memorized bent shape and the blade shape in activated condition, knowledge of the displacement due to the aerodynamic/centrifugal load is fundamental for operation of the actual cooling fan operation and could be suitable for tuning the thermomechanical treatment of the SMA. In literature, several applications can be found regarding the analysis of the aerodynamic/centrifugal load applied to composite structures and for a wide range of material stiffness [19,20]. …”

Section: Fem Analysismentioning

confidence: 99%

Analysis of the Aerodynamic and Structural Performance of a Cooling Fan with Morphing Blade

Suman

Fortini

Aldi

et al. 2017

IJTPP

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Abstract:The concept of smart morphing blades, which can control themselves to reduce or eliminate the need for active control systems, is a highly attractive solution in blade technology. In this paper, an innovative passive control system based on Shape Memory Alloys (SMAs) is proposed. On the basis of previous thermal and shape characterization of a single morphing blade for a heavy-duty automotive cooling axial fan, this study deals with the numerical analysis of the aerodynamic loads acting on the fan. By coupling computational fluid dynamics and finite element method approaches, it is possible to analyze the actual blade shape resulting from both the aerodynamic and centrifugal loads. The numerical results indicate that the polymeric blade structure ensures proper resistance and enables shape variation due to the action of the SMA strips.

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Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation

Cited by 21 publications

References 6 publications

Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment

Fluid Structure Interaction Modelling of Tidal Turbine Performance and Structural Loads in a Velocity Shear Environment

Coupling Numerical Methods and Analytical Models for Ducted Turbines to Evaluate Designs

Analysis of the Aerodynamic and Structural Performance of a Cooling Fan with Morphing Blade

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