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- Atcheson et al.
An experimental study measuring the performance and wake characteristics of a 1:10th scale horizontal axis turbine in steady uniform flow conditions is presented in this paper.
Large scale towing tests conducted in a lake were devised to model the performance of the tidal turbine and measure the wake produced. As a simplification of the marine environment, towing the turbine in a lake…
- Goldschmidt et al.
A marine hydrokinetic (MHK) cycloturbine is a renewable electric power generation system used in rivers or tidal environments to address the need for electricity in remote regions. MHK cycloturbines have hydrofoils oriented perpendicular to the flow in a paddlewheel configuration, and use lift generated from these foils to produce power. Due to the high cost associated with its operation and…
- Schmitt et al.
The first tidal turbine arrays have now been installed as the world strives to reach net zero carbon targets by 2050. Underwater noise emissions from single tidal turbine devices have caused some environmental concern in the past and therefore determining levels of noise emitted from these structures has become a crucial component of the consenting process. Ecological concerns include auditory…
- Nishi et al.
The ultra-small axial flow hydraulic turbine is a portable, palm-sized hydraulic turbine that can be applied to low head applications. By redesigning the original runner of this turbine using a method which uniformized the axial flow velocity, we succeeded in improving the performance of the runner. However, the mechanism of the improved performance of the optimized runner was not sufficiently…
- Cronin et al.
Ocean Renewable Power Company, Inc. (ORPC) recently completed an EU Horizon 2020 funded project to develop and test a “wet-gap” generator for use with their tidal and river energy converters. This wet-gap system is designed for a normal operating condition of a seawater flooded electrical generator which would typically be air or oil filled. This development removes the need for insulating oil…
- Draycott et al.
Tidal turbines are subject to large hydrodynamic loads from combinations of currents and waves, which contribute significantly to fatigue, extreme loading and power flow requirements. Physical model testing enables these loads and power fluctuations to be assessed and understood in a controlled and repeatable environment. In this work, a 1:15 scale tidal turbine model is utilised to further…
- Rahimian et al.
Horizontal-axis marine current turbines (HAMCTs) are devices which harness kinetic energy from oceans, rivers or straits. Model scale tests are a trusted method to define the hydrodynamic characteristics of HAMCTs, and can also be used to optimize turbine design and validate numerical models.
This paper presents experimental results for model-scale 2-bladed HAMCTs with diameters of 800…
- Luznik et al.
Scale model tests were conducted on a three bladed horizontal axis tidal turbine in a large tow tank facility at the United States Naval Academy. Performance characteristics are presented for a turbine towed at a constant carriage speed for cases with and without surface waves. Intermediate waves were modeled that are representative of swells typically found on the continental shelf of the…
- Myers and Bahau
A 0.4 m diameter (1:30th scale) horizontal axis marine current turbine (MCT) was tested in a circulating water channel. The turbine
performance and wake characteristics were determined over a range of flow speeds and rotor thrust coefficients. Measurements of the
water surface elevation profiles indicated increasing variation and surface turbulence with increasing flow speeds.… - Cornett et al.
The potential for dangerous interactions with floating debris is a leading consideration when evaluating potential sites for deployment of hydrokinetic power systems, yet to date, relatively little research effort has been directed towards developing and proving effective devices and systems for protecting turbines from floating debris.
This paper presents and discusses results from a…
- Crooks et al.
This paper introduces a phase one computational design analysis study of a hydrokinetic horizontal parallel stream direct-drive(no gear box)counter-rotating Darrieus turbine system. This system consists of two Darrieus rotors that are arranged in parallel and horizontal to the water stream and operate in counter-rotation due to the incoming flow. One of the rotors directly drives an armature…
- Liu et al.
In this work, an off-grid hydrogen production system powered by marine current energy was studied, which employed a horizontal axis marine current turbine (HAMCT) and a polymer electrolyte membrane (PEM) electrolyzer fed with ultrapure water. The fluid kinetic energy of the marine current will be captured by the turbine and finally stored as hydrogen energy through the electrolysis reaction in…
- Van Ness
Cost and reliability remain among the main barriers limiting widespread adoption of riverine, estuarine, or ocean current turbine power generation. In particular, structural loads are significantly greater than for wind turbines with equivalent power output, which contributes to higher costs. Compounded with uncertainties about hydrodynamic loads, this can contribute to structural failure or…
- Kim and Gunawan
Hydrokinetic turbine blades experience a complete cycle of reversed stress during each revolution in the course of deployment and operation. Blades are usually designed as thin as possible to optimize the turbine power performance and minimize the cost of manufacturing. However, significant deflections (deformations) on the blade during its operation can cause oscillatory motions, such as…
- Lam et al.
To achieve the full potential of tidal stream energy, developers are incentivised to use larger blades on tidal turbines. This requires validation of blade structural designs through full-scaleblade fatigue teststo de-risk the engineering process. However, the loading scenarios encountered in testing facilities and those in reality could be significantly different, which induces errors in…
- Lust et al.
Testing of a 1:6 scale model of an H-Darrieus cross-flowhydrokineticturbine (U.S. Department of Energy’s Reference Model 2 River Current Turbine) was conducted in the largetowing tankfacility at the United States Naval Academy. Tests were conducted in current only conditions at a range of diameter-basedReynolds numbersand at several turbine depths. Reynolds number independence was observed at…
- Felice et al.
A scaled-model of a horizontal axis tidal current turbine (HATCT) is tested in the CNR-INM Circulating Water Channel. The experiments are designed to establish in the first place the performances of the turbine at different working settings. The second goal is to investigate the hydrodynamics generated by the turbine in the near wake using theParticle Image Velocimetry(PIV) technique. For this…
- Chen et al.
Physical modellingwas performed to study thehydrodynamicsand wake interferences of a tidal stream turbine sited inclose proximityto different seabed elements. Theseabed topographyvariation had a significant effect on the tidal stream turbine behavior. The averagepower outputof the turbine with the presence of the small seabed topography increased by about 11%, while the power output of the…
- Lin et al.
Tidal stream turbines may suffer severe scour in the marine environment, which poses a threat to their structural stability. However, there has been limited research conducted on the scour processes around tidal stream turbines. In order to address this gap, physical experiments are conducted to investigated scour development around a tripod-supported tidal stream turbine. The experimental…
- Guzmán and Hill
Few numerical studies have been carried out on the RM1 tidal turbine to fully characterize the wake and analyze geometric modifications that could enhance power production and wake recovery. Javaherchi et al. compared the Rotating Reference Frame (RRF) and Blade Element Method (BEM) models and found their limitations for different TSR ranges. Niebuhr et al. validated their numerical model…
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