Evaluation of the durability of composite tidal turbine blades

Davies, Peter; Germain, Grégory; Gaurier, Benoît; Boisseau, Amélie; Perreux, Dominique

doi:10.1098/rsta.2012.0187

Cited by 43 publications

(41 citation statements)

References 16 publications

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“…In another study, [10] presented interesting turbine performance and thrust curves, mainly oriented towards blade loads owing to oscillatory flows, similarly to [11] and [12]. Whilst some of those experimental results were used as a basis for numericalexperimental validation such as [13] and [14], none of them follow a standard experimental 25 protocol.…”

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confidence: 99%

Tidal energy “Round Robin” tests comparisons between towing tank and circulating tank results

Gaurier

Germain

Facq

et al. 2015

International Journal of Marine Energy

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One key step of the industrial development of a tidal energy device is the testing of scale prototype devices within a controlled laboratory environment. At present, there is no available experimental protocol which addresses in a quantitative manner the differences which can be expected between results obtained from the different types of facilities currently employed for this type of testing. As a consequence, where differences between results are found it has been difficult to confirm the extent to which these differences relate to the device performance or to the test facility type.In the present study, a comparative "Round Robin" testing programme has been conducted as part of the EC FP VII MaRINET program in order to evaluate the impact of different experimental facilities on the test results. The aim of the trials was to test the same model tidal turbine in four different test facilities to explore the sensitivity of the results to the choice of facility. The facilities comprised two towing tanks, of very different size, and two circulating water channels.Performance assessments in terms of torque, drag and inflow speed showed very similar results in all facilities. However, expected differences between the different tank types (circulating and towing) were observed in the fluctuations of torque and drag measurements. The main facility parameters which can influence the behaviour of the turbine were identified; in particular the effect of blockage was shown to be significant in cases yielding for high thrust coefficients, even at relatively small blockage ratios.

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confidence: 99%

Tidal energy “Round Robin” tests comparisons between towing tank and circulating tank results

Gaurier

Germain

Facq

et al. 2015

International Journal of Marine Energy

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“…Yet some studies focused on the assessment of the coupled influence of water and stress [6-M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 9], mainly on thermosets composites [10][11][12][13][14][15]. These studies mostly underlined the acceleration of water diffusion in polymer resulting from the applied stress [16].…”

Section: Contextmentioning

confidence: 99%

Coupled hydro-mechanical aging of short flax fiber reinforced composites

Regazzi

Corn

Ienny

et al. 2016

Polymer Degradation and Stability

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One of the challenges in the widespread use of biocomposites for engineering applications is the influence of environmental conditions on their mechanical properties, particularly for a combination of aging factors such as temperature, moisture, and mechanical stresses. Thus, the purpose of this paper is to study the influence of coupled aging factors by focusing on a 100% bio-based and biodegradable composites made of flax/poly(lactic acid) with several fiber contents. The development of a specific testing setup enabled continuous in-situ measurements and allowed comparing the effects of combined aging factors to those of uncombined aging factors. It was confirmed that the aging temperature in wet conditions led to a loss of elastic properties, especially for higher fiber fractions. While creep tests in dry conditions resulted in little decrease of elastic properties, it was observed that mechanical loading of the materials combined with water immersion resulted in a strong synergistic effect on the loss of stiffness. Finally, the presence of fibers reduced environmental stress cracking mechanisms and increased the time to failure.

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“…Quality control checks, including interlaminar shear, revealed one set of samples to be of better quality, and tests indicated that the lower quality samples resulted in poorer fatigue performance compared to specimens of good quality [23]. For a composite marine propeller, random variations due to fiber misalignments, voids, laminate property uncertainties, and boundary conditions add to the uncertainty of the overall propeller response compared to homogeneous metallic propellers [24].…”

Section: Introductionmentioning

confidence: 99%