A Technology Review and Simulation Based Performance Analysis of River Current Turbine Systems

Khan, Mohammad Junaid; Iqbal, M. Tariq; Quaicoe, John E.

doi:10.1109/ccece.2006.277821

Cited by 21 publications

(12 citation statements)

References 12 publications

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“…A power coefficient reaches 1.22 and is exceeding the Betz limit of 0.59 due to the use of diffuser device. Compared with Ponta (2000) and Khan et al (2006), where a maximum velocity increase factor of 1.67 was reported, the velocity increase factor of 1.22 in ducted waterwheel current turbine with solar-planetary type blades is acceptable.…”

Section: Resultsmentioning

confidence: 92%

New Waterwheel Blades For Power Generation In Kuroshio

Huang

Lee²,

Lee

et al. 2013

Proceedings of the New Developments in Structural Engineering and Construction

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Kuroshio, one of ocean currents in the Pacific, passing through the eastern Taiwan provides a kind of clean ocean energy. For collecting Kuroshio power, we need to build high performance turbine generators suitable for flow speed less than 1.5 m/s. Conventional blades of waterwheel turbine are usually fixed to the rotating disk, and this leads to retard the rotation of the rotating disk due to the counteraction of the thrust. In this study, we present a new waterwheel blade, solar-planetary type blades, to upgrade energy conversion efficiency. A preliminary experiment was conducted at Gia-nan irrigation ditch located on the downstream of Wushantou dam in Taiwan. Experimental results indicate that waterwheel apparatus with solar-planetary type blades can raise the output power from 3.3 kW to 13.8 kW when the flow speed varied from 0.5 m/s to 1.2 m/s. The power coefficient is 1.22 and power output reaches 7.51 kW at 1.0 m/s water velocity. Compared with fixed type blades, the proposed rotatable blades can improve the power generation efficiency and enhance energy conversion efficiency.

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Section: Resultsmentioning

confidence: 92%

New Waterwheel Blades For Power Generation In Kuroshio

Huang

Lee²,

Lee

et al. 2013

Proceedings of the New Developments in Structural Engineering and Construction

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“…Similar to the situation with tidal currents, however, little has been published regarding the velocity distribution and the possible degree of utilisation. One of few authors to study river current turbines is Khan et al, [21][22][23][24][25] but the focus seems to be more on the technology rather than on the resource. In one of the articles, 23 Khan asks the question what the definition of a resourceful site would be.…”

Section: A Degree Of Utilisationmentioning

confidence: 97%

On the velocity distribution for hydro-kinetic energy conversion from tidal currents and rivers

Lalander

Grabbe

Leijon

2013

Journal of Renewable and Sustainable Energy

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Tidal currents and rivers are promising sources of renewable energy given that suitable turbines for kinetic energy conversion are developed. To be economically and technically feasible, a velocity distribution that can give a high degree of utilization (or capacity factor) while the ratio of maximum to rated velocity is low would be preferable. The rated velocity is defined as the velocity at which rated power is achieved. Despite many attempts to estimate the resource, however, reports on the possible degree of utilisation from tidal currents and rivers are scarce. In this paper, the velocity distribution from a number of regulated rivers, unregulated rivers, and tidal currents have been analysed regarding the degree of utilisation, the fraction of converted energy, and the ratio of maximum to rated velocity. Two methods have been used for choosing the rated velocity; one aiming at a high fraction of converted energy and one aiming at a high degree of utilisation. Using the first method, with a rated velocity close to the maximum velocity, it is unlikely that the turbine will reach the cutout velocity. This results in, on average, a degree of utilisation of 23% for regulated rivers, 19% for unregulated rivers, and 17% for tidal currents while converting roughly 30%-40% of the kinetic energy. Choosing a rated velocity closer to the mean velocity resulted in, on average, a degree of utilisation of 57% for regulated rivers, 52% for unregulated rivers, and 45% for tidal currents. The ratio of maximum to rated velocity would still be no higher than 2.0 for regulated rivers, 1.2 for unregulated rivers, and 1.6 for tidal currents. This implies that the velocity distribution of both rivers and tidal currents is promising for kinetic energy conversion. These results, however, do not include weather related effects or extreme velocities such as the 50-year velocity. A velocity factor is introduced to describe what degree of utilisation can be expected at a site. The velocity factor is defined as the ratio U max =U rate at the desired degree of utilisation, and serves as an early indicator of the suitability of a site. V C 2013 American Institute of Physics. [http://dx.

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“…Others are the Blue Energy tidal turbine, a ducted 4-bladed fixed-geometry Darrieus turbine, mounted in a durable concrete marine caisson that acts as a flow concentrator and the Hydro Helix turbine, a system that features a ducted turbine fixed to the seabed via a gravity foundation mentioned in [18]. More discussions on duct augmentation in river/marine applications can be found in [88][89][90]. A survey conducted on all systems working as a speed increaser found that a duct captures a large area of stream and accelerates the flow through a narrowing channel into the turbine.…”

Section: Efficiency Increase Of Turbines In the Worldmentioning

confidence: 99%