A constrained optimisation process for the design of tidal turbine blades with experimental validation

Winter, Alexei; Tryfonas, Theo

doi:10.23919/oceans.2011.6107131

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Research in the field of blade designs and design methodologies for overspeed control has been undertaken and presented in such papers as [9,12,13,14,15] which discuss and work to mitigate some of the issues discussed. A primary focus for blade development in these projects has been controlling the thrust forces as the tidal velocity increases.…”

Section: The Overspeed Methodsmentioning

confidence: 99%

“…As Eqs. (12) and (13) show, if the minimum negative p lr on a blade section is equal to p v , then σ r will be equal to the minimum negative value of C presr . Therefore, an inception cavitation number can be defined as…”

Section: Methods Of Cavitation Analysismentioning

confidence: 99%

“…As their definitions in Eqs. (13) and (15) indicate, these values were a function of λ; as λ increased, for each blade element, σ r decreased towards the value of σ ir . Plotting these two cavitation-related numbers against λ, for elements all along the blade, gave a more detailed visual tool to assess the occurrence, location(s) and extent of cavitation on the blade across the entire operating range.…”

Section: Cavitation Analysismentioning

confidence: 96%

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Development and initial application of a blade design methodology for overspeed power-regulated tidal turbines

Gracie-Orr

Nevalainen²,

Johnstone³

et al. 2016

International Journal of Marine Energy

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The range and variability of flow velocities in which horizontal axis tidal stream turbines operate introduces the requirement for a power regulation method in the system. Overspeed power regulation (OSPR) has the potential to improve the structural robustness and decrease the complexity associated with active pitch power regulation methods, while removing the difficulties of operating in stalled flow. This paper presents the development of a methodology for the design of blades to be used in such systems. The method requires a site depth, maximum flow velocity and rated power or flow speed as input parameters. The pitch setting, twist and chord distribution were set as input parameters, variable through the use of alteration functions. Rotor performance has been broken down into OSPR performance metrics which consider coefficients of power and thrust, and cavitation inception. Three visual-numerical tools have been developed: the OSPR performance metrics were used in conjunction with a one-at-a-time sensitivity analysis approach to develop a design space; cavitation inception analyses gave plots of converging cavitation and pressure terms for each blade section; the local angle of attack and torque distribution across the blade designs were plotted at key turbine operation states. Alterations to pitch setting and twist distribution are shown to have most impact upon the design requirement of increased gradient in the rotor speed-efficiency relationship in the overspeed region; coupled with such alterations, targeted changes to the chord distribution have been shown to increase the maximum efficiency. The prevention of cavitation has been highlighted as a driver for speed-limiting design alterations. While facilitating blade design, the methodology also produces experiential knowledge which can be stored, and shared in graphical format

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Section: The Overspeed Methodsmentioning

confidence: 99%

Section: Methods Of Cavitation Analysismentioning

confidence: 99%

Section: Cavitation Analysismentioning

confidence: 96%

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Development and initial application of a blade design methodology for overspeed power-regulated tidal turbines

Gracie-Orr

Nevalainen²,

Johnstone³

et al. 2016

International Journal of Marine Energy

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show abstract

“…In particular, the rotor configuration was reconsidered and the turbine blades were redesigned. Following a ‘systemic approach’ as it was done in [12], the novel turbine blade design method presented in this paper aims to improve the performance of the GEMSTAR configuration, searching for an optimised blade geometry at the design point while meeting the requirements of the fixed pitch – variable speed control strategy adopted for the generator coupling. In comparison to previous works, the paper presents an alternative approach to the blade aerodynamic design, developing a design procedure based on the blade element theory and adjusted for the specific issues of coupling the fixed‐pitch configuration and the de‐fluxing control strategy.…”

Section: Introductionmentioning

confidence: 99%

Design of GEMSTAR tidal current fixed pitch rotor controlled through a Permanent Magnet Generator (PMG) de‐fluxing technique

Coiro

Troise²,

Bizzarrini³

et al. 2020

IET Renewable Power Generation

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Effect of Blade Design and Control Strategies on Levelized Cost of Energy of Tidal Stream Turbines

Coiro

Lazzerini

2021

2021 International Conference on Electrical, Computer, Communications and Mechatronics Engineering (ICECCME)

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A constrained optimisation process for the design of tidal turbine blades with experimental validation

Cited by 4 publications

References 4 publications

Development and initial application of a blade design methodology for overspeed power-regulated tidal turbines

Development and initial application of a blade design methodology for overspeed power-regulated tidal turbines

Design of GEMSTAR tidal current fixed pitch rotor controlled through a Permanent Magnet Generator (PMG) de‐fluxing technique

Effect of Blade Design and Control Strategies on Levelized Cost of Energy of Tidal Stream Turbines

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