Experimental and numerical study on performance of shrouded hydrokinetic turbines

Gish, L. Andrew; Hawbaker, G.

doi:10.1109/oceans.2016.7761041

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…Secondly, changes in the Cp value of a water turbine are also influenced by the design of the shroud, as the shroud design plays an important role in maximizing the energy generated by the turbine when there is a change in the yaw angle. According to previous research conducted by Gish et al [23], changes in the yaw angle of a water turbine can affect the value of Cp of the water turbine. The results of the research show that when the yaw angle increases, the Cp value of the water turbine decreases.…”

Section: Interpretation Of Resultsmentioning

confidence: 98%

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Leni,

Aprilman

et al. 2023

INVOTEK

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This research aims to analyze the performance of hydrokinetic turbines under yaw misalignment conditions using descriptive statistical methods on coefficient of power (Cp) data. Tests were conducted at water velocities of 0.7, 0.9, and 1.1 m/s for three types of turbine shrouds consisting of turbines without shrouds, turbines with two different types of shrouds, at yaw angles from 0° to 25° with 5° intervals. The study concludes that the performance of each turbine type is significantly influenced by the combination of water flow velocity and yaw angle. The diffuser type has the highest Cp value at every yaw angle, but its performance decreases with increasing yaw angle. The Blade type has poorer performance compared to the diffuser at every yaw angle and has the best performance at a combination of 1.1 m/s velocity and 5° yaw angle. Meanwhile, the shroud type has more stable performance and is not greatly affected by variations in velocity and yaw angle. Based on the analysis of changes in average Cp values with changes in yaw angle at V 0.7 m/s, all three turbine types experienced an increase in Cp value at a yaw angle of 5, with the shroud experiencing the most significant increase. At V 0.9 m/s, the diffuser and shroud types were able to maintain their average Cp values at every yaw angle, while the blade type decreased with increasing yaw angle and experienced a significant decrease at a yaw angle of 25. At V 1.1 m/s, the diffuser and blade types experienced a decrease in performance with every increase in yaw angle, but the shroud type was able to maintain the same Cp value and even experienced a significant increase at a yaw angle of 5.

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Section: Interpretation Of Resultsmentioning

confidence: 98%

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Leni,

Aprilman

et al. 2023

INVOTEK

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“…The increase in extracted power is due to the fact that the divergent shaped shroud contributes to lowering pressure at the turbine outlet and thereby accelerating the flow through the turbine [9]. Thus, if the rotor is placed before the divergent shroud (position 3), then the speed through it increases given the above mentioned effect.…”

Section: Findings and Results Interpretationmentioning

confidence: 99%

Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model

Chihaia¹,

El-Leathey²,

Circiumaru³

et al. 2019

E3S Web Conf.

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The objective of the paper is to study the influence of certain shroud types suitable for horizontal axis hydrokinetic turbines using experimental testing in order to increase the energy conversion efficiency. The scale model of the shrouded hydrokinetic turbine is tested on a dedicated experimental bench for axial hydraulic turbine models. Two types of shrouds were tested in order to be compared: convergent shroud and divergent shroud. The rotor and shroud were made using 3D printer technology and were tested at a water velocity of 0.9 m/s on the closed-circuit testing bench. The testing facility allows the determination of the power extracted for each shroud at five distinct positions. Thus, the rotor can be moved within the shroud from inlet to outlet in order to establish the proper operating position. The mechanical power is measured using a torque transducer and an electromagnetic particle brake. The testing results will be analysed based on the variation of power curves obtained for different shroud types and operating positions. The optimum design and the best operating position will be recommended by comparing the testing result with the data collected from the bare turbine using the same rotor placed directly in free flow.

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“…The shrouds have the role of reducing the pressure at the exit of the turbine and therefore accelerating the water flow through the turbine. Gish and Hawbaker [1] studies two different shroud designs and their performance is compared to that of a turbine without intubation. Both shrouds had the same diffuser angle (20°) but different area ratios, crosssectional shapes, and tip gaps.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Flow Induced by Different Shrouds Geometries

et al. 2023

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Energy consumption continues to rise due to the increase in the quality of human life. On the other hand, production of these energies must be done with the smaller impact on the environment as possible. All these facts are challenging engineers and researchers from this domain to develop new equipments or to improve the efficiency of the energy production equipments. It was proved that in the case of turbine, if a shroud is applied, the efficiency is raised. Given that in this paper is presented a study performed on different geometry of shrouds with different fixing elements. Computational fluid dynamics (CFD) simulations were performed using ANSYS Fluent software. The numerical domain rigorously reproduces an experimental set-up from the laboratory. The rectangular fixing element do not deliver the expected result, instead it decreases the velocity in interest zone. The most important finding is that the velocity of the fluid increases by more than 50% in the most constrained section with convergent-divergent shroud.

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Experimental and numerical study on performance of shrouded hydrokinetic turbines

Cited by 8 publications

References 4 publications

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Performance Analysis of Hydrokinetic Turbine Using Shroud Ratio Comparison under Yaw Misalignment Condition

Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model

Evaluation of the Flow Induced by Different Shrouds Geometries

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