Hydrodynamic Design and Analysis of Horizontal Axis Marine Current Turbines With Lifting Line and Panel Methods

Baltazar, J.; Machado, João Pedro; Campos, J. A. C. Falca ̃o de

doi:10.1115/omae2011-49377

Cited by 6 publications

(8 citation statements)

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“…In general, the agreement of the two numerical models with experimental data is comparable with some exceptions. Results by the present BIEM-VFC model better reproduce measured turbine power in case Φ = 20 • and thrust in case Φ = 25 • , while results from [7] better predict thrust in case Φ = 27 • . In these cases, differences occur throughout the TSR range and hence they can be explained as a combined effect of different viscosity correction and trailing wake models in the two formulations.…”

Section: Variable Pitch Turbine Studymentioning

confidence: 82%

“…In order to complete the present validation study, it is also interesting to compare results by the proposed BIEM-VFC approach with data from the literature obtained using different computational models. Two cases are considered here: Bahaj et al [25] Comparisons between the present BIEM-VFC model and the BIEM with viscous flow correction proposed in [7] are presented in Figure 30. In general, the agreement of the two numerical models with experimental data is comparable with some exceptions.…”

Section: Variable Pitch Turbine Studymentioning

confidence: 99%

“…A major difficulty is that turbine blades frequently operate at high angle of attack and viscosity induced separation and stall significantly affect generated thrust and power. Baltazar and Falcão de Campos [6,7] address the problem by proposing models to correct inviscid-flow predictions by a BIEM for three-dimensional steady flows. The lift force contribution evaluated at each blade section by BIEM is corrected by comparing viscous and inviscid flow lift coefficients of two-dimensional profiles representatives of blade sections, while blade section drag is taken from two-dimensional polar curves.…”

Section: Introductionmentioning

confidence: 99%

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Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Salvatore¹,

Sarichloo²,

Calcagni³

2018

JMSE

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A computational methodology for the hydrodynamic analysis of horizontal axis marine current turbines is presented. The approach is based on a boundary integral equation method for inviscid flows originally developed for marine propellers and adapted here to describe the flow features that characterize hydrokinetic turbines. For this purpose, semi-analytical trailing wake and viscous flow correction models are introduced. A validation study is performed by comparing hydrodynamic performance predictions with two experimental test cases and with results from other numerical models in the literature. The capability of the proposed methodology to correctly describe turbine thrust and power over a wide range of operating conditions is discussed. Viscosity effects associated to blade flow separation and stall are taken into account and predicted thrust and power are comparable with results of blade element methods that are largely used in the design of marine current turbines. The accuracy of numerical predictions tends to reduce in cases where turbine blades operate in off-design conditions.

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Section: Variable Pitch Turbine Studymentioning

confidence: 82%

Section: Variable Pitch Turbine Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Salvatore¹,

Sarichloo²,

Calcagni³

2018

JMSE

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Salvatore¹,

Sarichloo²,

Calcagni³

2018

Preprint

View full text Add to dashboard Cite

A computational methodology for the hydrodynamic analysis of horizontal axis marine current turbines is presented. The approach is based on a boundary integral equation method for inviscid flows originally developed for marine propellers and adapted here to describe the flow features that characterize hydrokinetic turbines. To this purpose, semi-analytical trailing wake and viscous-flow correction models are introduced. A validation study is performed by comparing hydrodynamic performance predictions with two experimental test cases and with results from other numerical models in the literature. The capability of the proposed methodology to correctly describe turbine thrust and power over a wide range of operating conditions is discussed. Viscosity effects associated to blade flow separation and stall are taken into account and predicted thrust and power are comparable with results of blade element methods that are largely used in the design of marine current turbines. The accuracy of numerical predictions tend to reduce in cases where turbine blades operate in off-design conditions.

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“…BUCKLAND et al [] extended this approach to by including a varying azimuth angle. the BALTAZAR et al [15] presented a model for predicting the cavitation number for a wide range of operating points based on the pressure distribution of the blade. This model took into account various rotor rotational speeds, but the effect of the near-tip flow on the pressure distribution has not been addressed.…”

mentioning

confidence: 99%

An enhanced and validated performance and cavitation prediction model for horizontal axis tidal turbines

Kaufmann

Carolus

Starzmann

2017

International Journal of Marine Energy

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Tidal energy represents a promising resource for the future energy mix. For harnessing tidal currents free stream horizontal axis turbines have been investigated for some years. The acting physics is very similar to the one of horizontal axis wind turbines, with the additional phenomenon of cavitation, which causes performance reduction, flow induced noise and severe damages to the turbine blade and downstream structures.The paper presents an enhanced semi-analytical model that allows the prediction of the performance characteristics including cavitation inception of horizontal axis tidal turbines. A central component is the wellknown blade element momentum theory which is refined by various submodels for hydrofoil section lift and drag as a function Reynolds number and angle of attack, turbine thrust coefficient, blade hub and tip losses and cavitation. Moreover, the model is validated by comparison with comprehensive experimental data from two different turbines.Predicted power and thrust coefficient characteristics were found to agree well with the experimental results for a wide operational range and different inflow velocities. Discrepancies were observed only at low tip speed ratios where major parts of the blades operate under stall conditions. The predicted critical cavitation number is somewhat larger than the measured, i.e. the prediction is conservative. As an overall conclusion the semi-analytical model developed seems to be so fast, accurate and robust that it can be integrated in a future workflow for optimizing tidal turbines.

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Hydrodynamic Design and Analysis of Horizontal Axis Marine Current Turbines With Lifting Line and Panel Methods

Cited by 6 publications

References 0 publications

Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

An enhanced and validated performance and cavitation prediction model for horizontal axis tidal turbines

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