Non-dimensional scaling of tidal stream turbines

Mason-Jones, Allan; O'Doherty, Daphne Maria; Morris, Ceri; O'Doherty, Timothy; Byrne, Carlton Barrie Baylis; Prickett, Paul William; Grosvenor, Roger Ivor; Owen, I.; Tedds, S. C.; Poole, Robert J.

doi:10.1016/j.energy.2012.05.010

Cited by 89 publications

(61 citation statements)

References 8 publications

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“…Therefore two geometrically similar turbines can be compared if their TSR matches and their Re are above critical value. For a particular turbine, as in the case of Mason-Jones et al [6], critical value was Re = 5 × 10 5 , but this can change depending on the geometry. We assume some margin to be sure that results are valid for all types of turbines and therefore set critical Re to 10 6 .…”

Section: Non-dimensional Scalingmentioning

confidence: 99%

“…For a particular turbine, as in the case of Mason-Jones et al [6], critical value was Re = 5 × 10 5 , but this can change depending on the geometry. We assume some margin to be sure that results are valid for all types of turbines and therefore set critical Re to 10 6 . Then for the turbine with a 1 m diameter, the minimum testing speed should be 1 m/s.…”

Section: Non-dimensional Scalingmentioning

confidence: 99%

“…A study of the non-dimensional scaling of tidal turbines was done by Mason-Jones et al [6]. Using the established Buckingham Pi theorem they calculated that turbines coefficient of power (C P ) and coefficient of thrust (C T ) are functions of Reynolds number (Re), and tip speed ratio (TSR), but after some critical value, Re, based on turbine diameter, no longer has any effect.…”

Section: Non-dimensional Scalingmentioning

confidence: 99%

“…The physical nature of hydrodynamic experiments is such that results at different scales can be compared only through non dimensional scaling laws. To resemble a full scale tidal turbine, the miniature prototype has to be geometrically similar and also have a Reynolds number above a certain limit [6]. The Reynolds number is controlled by flow velocity and size of prototype.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

“…Finding an optimal spacing distance is essential for the design of a testing vessel, because it will only be able physically to test a certain spacing range and the optimal value has to lie within. Twelve different simulations were made, with all possible combinations between two sets of longitudinal and lateral spacing expressed in multiples of turbine diameter, (x ∈ [4,6,8,10], y ∈ [2,3,4]). The area which one turbine occupies is calculated by multiplying longitudinal and lateral spacing.…”

Section: Cfd Of Tidal Turbine Arraymentioning

confidence: 99%

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Design of a Novel Experimental Facility for Testing of Tidal Arrays

Pintar

Kolios

2013

Energies

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Abstract:In order to obtain the maximum amount of energy from tidal stream extraction devices, deployment in large arrays should be studied. The area of seabed with favorable conditions is fairly limited; therefore layout spacing has to be optimized. In this paper a feasibility study for a novel experimental facility, suitable for the testing of an array of tidal devices, is presented. To avoid space and scale limitations of towing tanks, testing is proposed to be performed in large lakes or calm seas using a self-propelled vessel, which will carry an array of devices with variable spacing, creating relevant speed differences and measuring their performance and loading. Using hydrodynamic scaling laws, an appropriate size for test turbines and the range of vessel speed was determined to fulfill experimental requirements. Computational fluid dynamic simulations, using the actuator disc method, have suggested a suitable turbine array configuration to resemble real application conditions. A simplified model of the vessel was analyzed using the finite elements method to determine the main scantlings. The hull resistance calculated by empirical formulae was found to be negligible compared to the resistance of the tested turbine. It was confirmed that turbine size and speed determined by scaling laws are also reasonable from a propulsion point of view.

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Section: Non-dimensional Scalingmentioning

confidence: 99%

Section: Non-dimensional Scalingmentioning

confidence: 99%

Section: Non-dimensional Scalingmentioning

confidence: 99%

Section: Experimental Facilitiesmentioning

confidence: 99%

Section: Cfd Of Tidal Turbine Arraymentioning

confidence: 99%

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