Field measurements of a full scale tidal turbine

Jeffcoate, Penelope; Starzmann, Ralf; Elsaesser, Bjoern; Scholl, Stefan; Bischoff, Sarah

doi:10.1016/j.ijome.2015.04.002

Cited by 44 publications

(23 citation statements)

References 3 publications

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“…This procedure for calculating thrust differs from that typically used in scale-model studies [17] or field testing of smaller rotors [12], where load cells are placed on the turbine support structure and a correction is applied to remove the drag forces acting on the structural elements, leaving only the axial force on the rotor. This involves measuring the drag on the support structure without the rotor, something that was not practical for the turbine in this study and would not provide any information on the individual blade loading and bending moments.…”

Section: Instrumentationmentioning

confidence: 99%

“…Prototype-scale devices in open sea conditions have been tested to a lesser extent due to the inherent up-scaling challenges, e.g., Jeffcoate et al [12] tested a 4 m diameter, 50 kW turbine and Frost et al [13] compared the performance of a 1.5 m diameter turbine in both towing tank tests and at a tidal site. It should be noted that there are a significant number of engineering challenges when moving from small-scale prototype tests in controlled conditions to full-scale turbine deployments in open sea sites, particularly in terms of obtaining reliable device and environmental measurements.…”

Section: Introductionmentioning

confidence: 99%

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Rotor Loading Characteristics of a Full-Scale Tidal Turbine

Harrold

Ouro

2019

Energies

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Tidal turbines are subject to highly dynamic mechanical loading through operation in some of the most energetic waters. If these loads cannot be accurately quantified at the design stage, turbine developers run the risk of a major failure, or must choose to conservatively over-engineer the device at additional cost. Both of these scenarios have consequences on the expected return from the project. Despite an extensive amount of research on the mechanical loading of model scale tidal turbines, very little is known from full-scale devices operating in real sea conditions. This paper addresses this by reporting on the rotor loads measured on a 400 kW tidal turbine. The results obtained during ebb tidal conditions were found to agree well with theoretical predictions of rotor loading, but the measurements during flood were lower than expected. This is believed to be due to a disturbance in the approaching flood flow created by the turbine frame geometry, and, to a lesser extent, the non-typical vertical flow profile during this tidal phase. These findings outline the necessity to quantify the characteristics of the turbulent flows at sea sites during the entire tidal cycle to ensure the long-term integrity of the deployed tidal turbines.

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Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotor Loading Characteristics of a Full-Scale Tidal Turbine

Harrold

Ouro

2019

Energies

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“…Zhou et al summarized that the performance of the major industrialized large tidal turbines is about 40% [27]. Jeffcoate et al conducted vessel-mounted full-scale testing of the SCHOTTEL tidal generator (STG) turbine, and the results show that the system efficiency reached 35% [28]. Therefore, in this study, efficiency of tidal device is assumed as 35% from a conservative point of view in order to not overestimate the tidal current energy potential.…”

Section: Evaluation Methodsmentioning

confidence: 99%

Tidal Current Energy Resource Distribution in Korea

Hwang¹,

Jo²

2019

Energies

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Korea is a very well-known country for having abundant tidal current energy resources. There are many attractive coastal areas for the tidal current power that have very strong currents due to the high tidal range and the acceleration through the narrow channels between islands in the west and south coasts of the Korean peninsula. Recently, the Korean government announced a plan that aims to increase the portion of electricity generated from renewable energy to 20% by 2030. Korea has abundant tidal current energy resources; however, as reliable resource assessment results of tidal current energy are not sufficient, the portion of tidal current power is very small in the plan. Therefore, a reliable resource assessment should be conducted in order to provide a basis for the development plan. This paper describes the resource assessment of tidal current energy in Korea based on the observational data provided by KHOA (Korean Hydrographic and Oceanographic Agency) and numerical simulation of water circulation. As the observational data were unable to present the detailed distribution of the complicated tidal current between islands, numerical simulation of water circulation was used to describe the detailed distribution of tidal current in Incheon-Gyeonggi and Jeollanam-do, where the tidal energy potentials are abundant. The west and south coastal areas of Korea were divided into seven regions according to the administrative district, and the theoretical tidal current potential was calculated using average power intercepted. The results of this research can provide the insight of the tidal current energy development plan in Korea.

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“…prototypes deployed in open water [9]. The assessment of tidal turbines operating in array has 7 largely been done numerically using simplified Blade Element Momentum theory (BEMT) 8 through fully resolved three dimensional computational fluid dynamics (CFD) to large scale 9…”

Section: Problem and Inadequacies Of Current Statusmentioning

confidence: 99%

Experimental study of wake characteristics in tidal turbine arrays

Nuernberg

Tao

2018

Renewable Energy

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1For the successful deployment of large scale tidal turbine arrays occupying a large part of tidal 2 channels, understanding the effects of wake interaction in densely spaced arrays is of 3 importance. A comprehensive set of experiments has been conducted with scaled tidal turbines 4 to investigate the resulting wake characteristics in a number of different staggered array 5 configurations with up to four turbines on a designated support frame. Wake velocity deficits 6 and turbulence intensities at a number of locations within and downstream of the array are 7 presented and in addition the flow field recordings from Particle Image Velocimetry (PIV) 8 measurements are presented for visual investigation of the resulting wake field and wake 9 characteristics along the array centre line. The experiments show that lateral and longitudinal 10

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Field measurements of a full scale tidal turbine

Cited by 44 publications

References 3 publications

Rotor Loading Characteristics of a Full-Scale Tidal Turbine

Rotor Loading Characteristics of a Full-Scale Tidal Turbine

Tidal Current Energy Resource Distribution in Korea

Experimental study of wake characteristics in tidal turbine arrays

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