The prediction of the hydrodynamic performance of marine current turbines

Batten, W.M.J.; Bahaj, A.S.; Molland, A.F.; Chaplin, J.R.

doi:10.1016/j.renene.2007.05.043

Cited by 284 publications

(164 citation statements)

References 10 publications

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“…The authors also investigated the effect of yaw angle, immersion depth, and an adjacent rotor blade on the performance of an 80 cm diameter three bladed horizontal axis turbine in a cavitation tunnel and a towing tank (Bahaj et al, 2007b). Results of the numerical and experimental studies were then compared and it was stated the developed numerical method is a useful design and optimisation tool for the turbines energy output (Bahaj et al, 2007a;Batten et al, 2008Batten et al, , 2007. Myers and Bahaj (2006) performed an experimental study on a 40 cm diameter three bladed horizontal axis turbine in a circulating water channel.…”

Section: Shrouded Hydrokinetic Turbinesmentioning

confidence: 99%

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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Section: Shrouded Hydrokinetic Turbinesmentioning

confidence: 99%

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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“…The BEMT simulations were performed using the code developed in [26] and solved using the same lift and drag dataset as used in the simulations. Measurements in the towing tank were performed at a towing speed of 0.9 m s −1 for a range of tip speed ratios (TSR = ΩR/U 1 ) from approximately 4 to 7.…”

Section: (B) Turbine Performancementioning

confidence: 99%

Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines

Batten

Harrison

Bahaj

2013

Phil. Trans. R. Soc. A.

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The actuator disc-RANS model has widely been used in wind and tidal energy to predict the wake of a horizontal axis turbine. The model is appropriate where large-scale effects of the turbine on a flow are of interest, for example, when considering environmental impacts, or arrays of devices. The accuracy of the model for modelling the wake of tidal stream turbines has not been demonstrated, and flow predictions presented in the literature for similar modelled scenarios vary significantly. This paper compares the results of the actuator disc-RANS model, where the turbine forces have been derived using a blade-element approach, to experimental data measured in the wake of a scaled turbine. It also compares the results with those of a simpler uniform actuator disc model. The comparisons show that the model is accurate and can predict up to 94 per cent of the variation in the experimental velocity data measured on the centreline of the wake, therefore demonstrating that the actuator disc-RANS model is an accurate approach for modelling a turbine wake, and a conservative approach to predict performance and loads. It can therefore be applied to similar scenarios with confidence.

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“…In addition to a dedicated test site in Orkney with eight berths for full-scale pilot devices (Norris and Droniou 2007), there are already individual devices supplying power to the grid (MacEnri et al 2011) and the first commercial array is due to be installed in 2017. For conventional designs, the principle of operation is very similar to the familiar horizontal-axis wind turbines, although there are unique technological and environmental challenges (Fraenkel 2002;Batten et al 2008;Willis et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound

Togneri

Masters

2015

J. Ocean Eng. Mar. Energy

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We present turbulence results from two acoustic Doppler current profiler measurement campaigns carried out in Ramsey Sound at two locations within 50 m of one another. The first measurements were taken in 2009 and the second in 2011; both include a complete spring-neap cycle. In this paper we characterise turbulence through turbulent kinetic energy (TKE) density and integral lengthscales and their relationships with one another and with mean flow parameters. We briefly describe the methods used to calculate these parameters. We find that a flood-ebb asymmetry is present in the data from both measurement campaigns, but although the flood tides are similar at both locations, the ebb tides are much more energetic in the 2011 data than the 2009 data. We suggest that this may be due to differences in seabed features between the two measurement locations. Dimensional analysis is employed to investigate how TKE scales with mean flow velocity; we find that the expected quadratic scaling is not well supported by the data at either measurement location. As a consequence, flows that have more energetic turbulence may instead appear to be less turbulent if judged by turbulence intensity. We investigate the correlation between lengthscales and TKE density and find that it is highly site-specific: it should not be assumed that for a given measurement location highly energetic turbulence is associated with larger flow structures or vice versa.

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The prediction of the hydrodynamic performance of marine current turbines

Cited by 284 publications

References 10 publications

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines

Micrositing variability and mean flow scaling for marine turbulence in Ramsey Sound

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