Analysis of Wake Turbulence for a Savonius Turbine for Malaysia’s Slow-Moving Current Flow

Rahman, A. K.; Rajendran, K; Abdul-Rahman, Ayu; Suhri, Gisrina Elin; Dass, L

doi:10.14710/ijred.2022.45985

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…The design of the two ducting configurations in Fig. 2 incorporates parameters obtained from earlier research conducted by Huang Ming et al [6], [8]. This study aimed to conduct a numerical simulation to analyse the 3D viscous flow environment around the duct of a vertical axis current turbine.…”

Section: Modellingmentioning

confidence: 99%

Numerical Study of Ducted Turbines in Shallow Water Environment

Rosli,

Abdul Rahman,

Abdul-Rahman

et al. 2023

IJIE

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The development of tidal turbines, particularly for shallow water applications, is still in its early stages. Vertical axis tidal turbines (VATT) are often preferred for shallow water due to the bidirectional nature of tidal currents. Implementing a channelling system around a tidal turbine can significantly stabilise the flow field, increase the current velocity, and enhance the energy efficiency of the turbine. However, there has been limited exploration of using channelling techniques to improve the performance of VATTs in turbid areas. This study employs a numerical analysis using computational fluid dynamics (CFD) to investigate VATTs. The VATT model is represented by a cylindrical object with a diameter and height of 5 meters. The simulation focuses on the wake characteristics and the design of turbine arrays. The Reynolds-Averaged Navier-Stokes (RANS) equations are utilised as flow viscous solvers in ANSYS Fluent, and the effectiveness of the ducts in energy conversion is calculated using the realizable two-layer turbulence model. The primary objective of this study is to examine the impact of converging devices on tidal turbine performance and propose an optimal design for shallow water applications. The proposed ducted design shows an increase in current speed passing through the device by 11.1%. Although the wake generated by the multi-row staggered array layout disperses the flow to the side of the domain, the model demonstrates a 0.9% improvement in velocity magnitude. Conversely, the results for the single-row inline layout indicate the most favorable arrangement for shallow water applications, with a 19.4% increase in velocity magnitude and a shorter wake generation.

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Section: Modellingmentioning

confidence: 99%

Numerical Study of Ducted Turbines in Shallow Water Environment

Rosli,

Abdul Rahman,

Abdul-Rahman

et al. 2023

IJIE

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The Design and Analysis of a Novel Vertical Axis Small Water Turbine Generator for Installation in Drainage Lines

Lahamornchaiyakul

Kasayapanand

2023

Int. J. Renew. Energy Dev.

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The objective of this study was to determine the mechanical power efficiency of a novel vertical-axis small water turbine generator for installation in drainage lines. A 3D model was created to evaluate the performance of each design. The system was designed, analysed, and calculated for the most suitable geometries of the water inlet, drainage lines, main structure, and water turbine wheels using computational fluid dynamics software. The diameter of the water turbine wheel in the numerical model was 48 mm. The control volume technique was used in the numerical simulation method, and the k-epsilon turbulence model was employed to find the computational results. For the Computational Fluid Dynamics (CFD), the appropriate mash element for each model section was generated for numerical simulation, which showed that the torque from the water turbine modelling varied depending on the time domains and was related to speed relative to the developed force. The maximum torque and maximum power that a vertical-axis small water turbine for installation in a drainage line could generate at a maximum flow rate of 0.0030 m3/s were 0.55 N.m and 26.84 watts, respectively. Similarly, calculations with mathematical equations, found that the maximum mechanical power value after calculating the rate of loss within the pipe system was 12.95 watts. The forces generated by the speed and pressure of the fluid can then be applied to the structure of the water turbine wheel. The vertical-axis small water turbine for installation in a drainage line was analysed under its self-weight by applying a gravitational acceleration of 9.81 m/s2 in Solidworks Simulation software version 2022. The numerical simulations that resulted from this research could be used to further develop prototypes for small water turbines generating commercial electricity.

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Analysis of Wake Turbulence for a Savonius Turbine for Malaysia’s Slow-Moving Current Flow

Cited by 2 publications

References 32 publications

Numerical Study of Ducted Turbines in Shallow Water Environment

Numerical Study of Ducted Turbines in Shallow Water Environment

The Design and Analysis of a Novel Vertical Axis Small Water Turbine Generator for Installation in Drainage Lines

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