Forces on a marine current turbine during runaway

Goude, Anders; Lundin, Staffan

doi:10.1016/j.ijome.2017.09.007

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Moreover, Tigabu et al [24] numerically analysed the effects of turbine inertia on the start-up characteristics of a H-rotor hydrokinetic turbine. They noticed that if the turbine starts from rest with no load condition, it overshoots steady λ point before coming back to the steady operation of the VAWT i.e., steady λ. Goude and Lundin [25] found that as the turbine inertia reduces, the start-up time decreases, however, at higher inertia, the overshoot decreases and start-up goes through the four stage start-up process described by Hill et al [11].…”

Section: Start-up Dynamics Of Lift-based Vawtsmentioning

confidence: 98%

“…Additionally, instead of running the numerical simulations for a few thousand iterations, the simulations should be performed over a few million iterations (details in sections below), which is computationally prohibitive; each simulation in the present work took 4 months. Other computational-based research studies carried out on the start-up dynamics have also considered 2D models [15,[17][18][19][20]24,25]. Thus, the choice of considering a 2D model is justified.…”

Section: Geometry Of the Vawt And The Flow Domainmentioning

confidence: 99%

“…have also considered 2D models [15,[17][18][19][20]24,25]. Thus, the choice of considering a 2D model is justified.…”

Section: Geometry Of the Vawt And The Flow Domainmentioning

confidence: 99%

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Effect of Stator Blades on the Startup Dynamics of a Vertical Axis Wind Turbine

et al. 2022

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Vertical Axis Wind Turbines (VAWTs) are omni-directional, low-cost, low-efficiency wind power extractors. A conventional drag-based VAWT consists of multiple thin rotor blades with a typical peak Tip Speed Ratio (λ) of < 1. Their lower cut-in speed and maintenance cost make them ideal for power generation in urban environments. Numerous studies have been carried out analysing steady operation of VAWTs and quantifying their performance characteristics, however, minimal attention has been paid to their start-up dynamics. There are a few recent studies in which start-up dynamics of lift-based VAWTs have been analysed but such studies for drag-based VAWTs are severely limited. In this study, start-up dynamics of a conventional multi-blade drag-based VAWT have been numerically investigated using a time-dependant Computational Fluid Dynamics (CFD) solver. In order to enhance the start-up characteristics of the drag-based VAWT, a stator has been integrated in the design assembly. The numerical results obtained in this study indicate that an appropriately designed stator can significantly enhance the start-up of a VAWT by directing the flow towards the rotor blades, leading to higher rotational velocity (ω) and λ. With the addition of a stator, the flow fields downstream the VAWT becomes more uniform.

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Section: Start-up Dynamics Of Lift-based Vawtsmentioning

confidence: 98%

Section: Geometry Of the Vawt And The Flow Domainmentioning

confidence: 99%

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Effect of Stator Blades on the Startup Dynamics of a Vertical Axis Wind Turbine

et al. 2022

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“…One of the best designs of tidal energy generation is a model where the tidal current obtained from the energy harnessed from tidal resources without the erection of a dam and directly serving the tidal current to produce electricity using energy conversion apparatus/ turbines. This means that the tidal currents can be used interchangeably [18], hence, the associated term: tidal current turbine (also called hydrokinetic turbine [19,20].…”

Section: 2configuration Of Arraysmentioning

confidence: 99%

Modelling and simulation of tidal energy generation system: a systematic literature review

2022

IJATEE

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“…This results in a bigger overshoot in the simulation. It has been shown in [26] that the forces on the turbine blades during runaway (overshoot related to lost control of the turbine) can be up to 2.7 times the forces during nominal operation. It is, therefore, of great importance that the control system can brake the turbine at high rotational speeds.…”

Section: Step Response Of Change In Target DC Bus Voltagementioning

confidence: 99%

Validation of a Coupled Electrical and Hydrodynamic Simulation Model for a Vertical Axis Marine Current Energy Converter

2018

Self Cite

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This paper validates a simulation model that couples an electrical model in Simulink with a hydrodynamic vortex-model by comparing with experimental data. The simulated system is a vertical axis current turbine connected to a permanent magnet synchronous generator in a direct drive configuration. Experiments of load and no load operation were conducted to calibrate the losses of the turbine, generator and electrical system. The power capture curve of the turbine has been simulated as well as the behaviour of a step response for a change in tip speed ratio. The simulated results agree well with experimental data except at low rotational speed where the accuracy of the calibration of the drag losses is reduced.

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Forces on a marine current turbine during runaway

Cited by 6 publications

References 7 publications

Effect of Stator Blades on the Startup Dynamics of a Vertical Axis Wind Turbine

Effect of Stator Blades on the Startup Dynamics of a Vertical Axis Wind Turbine

Modelling and simulation of tidal energy generation system: a systematic literature review

Validation of a Coupled Electrical and Hydrodynamic Simulation Model for a Vertical Axis Marine Current Energy Converter

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