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Offshore Technology

Hydrodynamic Analysis of a Horizontal Axis Marine Current Turbine With a Boundary Element Method

[+] Author and Article Information
J. Baltazar

Department of Mechanical Engineering, Marine Environment and Technology Center (MARETEC), Instituto Superior Técnico (IST), Lisbon 1049-001, Portugalbaltazar@marine.ist.utl.pt

J. A. C. Falcão de Campos

Department of Mechanical Engineering, Marine Environment and Technology Center (MARETEC), Instituto Superior Técnico (IST), Lisbon 1049-001, Portugalfcampos@hidro1.ist.utl.pt

J. Offshore Mech. Arct. Eng 133(4), 041304 (Apr 08, 2011) (10 pages) doi:10.1115/1.4003387 History: Received July 31, 2008; Revised May 06, 2010; Published April 08, 2011; Online April 08, 2011

A low order potential based panel code is used to analyze the flow around the blades of a horizontal axis marine current turbine. An empirical vortex model is assumed for the turbine wake, which includes the variation of pitch of the helicoidal vortices trailing behind the blades. The analysis is carried out for uniform inflow conditions in steady flow for a turbine with controllable pitch for two different pitch settings in a wide range of tip-speed-ratios. Grid convergence studies carried out to verify the accuracy of predicted pressure distributions and integrated forces show a fast convergence with grid refinement for this geometry. The effect of the helicoidal wake model parameters used in the analysis is found to have a strong influence in the performance curves. The results are compared with experimental data from literature and with the lifting line theory. A discussion of viscous effects is also provided to help explaining the main discrepancies with the data.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Rotor coordinate reference systems

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Figure 2

Velocity and force triangles on a blade section in lifting line theory

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Figure 3

Panel arrangement for turbine rotor with a 5 deg set angle; note that only one wake surface is shown

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Figure 4

Comparison between LKC and IPKC, blade pressure distribution at radial section r/R=0.99, set angle of 5 deg, TSR=2 (left), and TSR=6 (right)

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Figure 5

Blade pressure distribution at radial sections r/R=0.60 (left) and r/R=0.90 (right), set angle of 5 deg, and TSR=6

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Figure 7

Optimum pitch distribution and its deviation from the blade geometric pitch at two representative radii

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Figure 8

Comparison between wake models with a 5 deg set angle, CT (left) and CP (right)

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Figure 9

Comparison between wake models with a 10 deg set angle, CT (left) and CP (right)

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Figure 10

Deviation of hydrodynamic radial pitch distribution in the analysis mode from optimum pitch for two representative TSR values

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Figure 11

Comparison with experimental data and lifting line for 5 deg set angle, CT (left) and CP (right)

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Figure 12

Comparison with experimental data and lifting line for 10 deg set angle, CT (left) and CP (right)

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Figure 6

Radial distribution of circulation on the blade, set angle of 5 deg, and TSR=6

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