The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
S V Prabhu - One of the best experts on this subject based on the ideXlab platform.
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performance study of modified savonius water turbine with two Deflector plates
International Journal of Rotating Machinery, 2012Co-Authors: Golecha Kailash, T I Eldho, S V PrabhuAbstract:Savonius rotor is a vertical axis rotor with simple in design and easy to fabricate at lower cost. The rotation of the rotor is due to the drag difference between the advancing blade and returning blade. Net driving force can be increased by reducing the reverse force on the returning blade or increasing the positive force on the advancing blade. Former can be realized by providing a flow obstacle to the returning blade and latter can be realized by concentrating the flow towards the advancing blade. The objective of the present work is to identify the optimal position of the Deflector plate (on advancing blade side) placed upstream to the flow which would result in increase in power generated by the rotor. Tests are conducted to identify the optimum position of the Deflector plate on the advancing blade side in the presence of a Deflector plate on the returning blade side at its optimum position. Results suggest that two Deflector plates placed at their optimal positions upstream to the flow increase the coefficient of power to 0.35. This is significantly higher than the coefficient of power of 0.14 observed for the rotor without Deflector plates.
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influence of the Deflector plate on the performance of modified savonius water turbine
Applied Energy, 2011Co-Authors: Kailash Golecha, T I Eldho, S V PrabhuAbstract:Abstract Savonius rotor is simple in design and easy to fabricate at a lower cost. The basic driving force of Savonius rotor is drag. The drag coefficient of a concave surface is more than the convex surface. Hence, the advancing blade with concave side facing the water flow would experience more drag force than the returning blade, thus forcing the rotor to rotate. Net driving force can be increased by reducing the reverse force on the returning blade. This can be realized by providing flow obstacle to the returning blade. The objective of the present work is to find out the optimal position of the Deflector plate upstream to the flow which would result in maximum power generated by the rotor. Experimental investigations are carried out to study the influence of the location of the Deflector plate on the performance of a modified Savonius rotor with water as the working medium at a Reynolds number of 1.32 × 10 5 . Eight different positions of the Deflector plate are attempted in this study. Results conclude that Deflector plate placed at its optimal position increases the coefficient of power by 50%. Maximum coefficient of power is found to be 0.21 at a tip speed ratio of 0.82 in the presence of Deflector plate. Two stage and three stage modified Savonius rotors are tested to study the influence of Deflector plate at the optimal position. Maximum coefficient of power improves by 42%, 31% and 17% with Deflector plate for two stage 0° phase shift, 90° phase shift and three stage modified Savonius rotor respectively.
Kailash Golecha - One of the best experts on this subject based on the ideXlab platform.
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influence of the Deflector plate on the performance of modified savonius water turbine
Applied Energy, 2011Co-Authors: Kailash Golecha, T I Eldho, S V PrabhuAbstract:Abstract Savonius rotor is simple in design and easy to fabricate at a lower cost. The basic driving force of Savonius rotor is drag. The drag coefficient of a concave surface is more than the convex surface. Hence, the advancing blade with concave side facing the water flow would experience more drag force than the returning blade, thus forcing the rotor to rotate. Net driving force can be increased by reducing the reverse force on the returning blade. This can be realized by providing flow obstacle to the returning blade. The objective of the present work is to find out the optimal position of the Deflector plate upstream to the flow which would result in maximum power generated by the rotor. Experimental investigations are carried out to study the influence of the location of the Deflector plate on the performance of a modified Savonius rotor with water as the working medium at a Reynolds number of 1.32 × 10 5 . Eight different positions of the Deflector plate are attempted in this study. Results conclude that Deflector plate placed at its optimal position increases the coefficient of power by 50%. Maximum coefficient of power is found to be 0.21 at a tip speed ratio of 0.82 in the presence of Deflector plate. Two stage and three stage modified Savonius rotors are tested to study the influence of Deflector plate at the optimal position. Maximum coefficient of power improves by 42%, 31% and 17% with Deflector plate for two stage 0° phase shift, 90° phase shift and three stage modified Savonius rotor respectively.
Zulfaa Mohamed-kassim - One of the best experts on this subject based on the ideXlab platform.
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The effects of Deflector longitudinal position and height on the power performance of a conventional Savonius turbine
Energy Conversion and Management, 2020Co-Authors: Mohd Badrul Salleh, Noorfazreena M. Kamaruddin, Zulfaa Mohamed-kassimAbstract:Abstract The limited electrical power inherent in rural and remote areas with a narrow width river can be addressed with the utilization of a Savonius hydrokinetic turbine (HKT) that generates electricity from a renewable hydro resource. However, despite its simple design, Savonius HKT practicality is hindered by low power performance. One solution to overcome this issue is to use an augmentation device such as a Deflector to improve the performance. However, the effects of Deflector geometric parameters on the power performance of such turbine have not been comprehensively studied and information about the flow physics around the turbine with the presence of a Deflector are still lacking in literature. Therefore, the present study aims to improve the power performance by varying the advancing blade and the returning blade Deflector longitudinal position ratios, ranging from 0.000 to - 0.500 and - 1.204 to - 1.704, respectively, followed by varying the Deflector height at 0.5 H , 1 H and 1.5 H of the turbine’s height. Quantitative study has shown that all variations of Deflector positions resulted in power performance improvements of more than 30% whereas a reduction by 7.69% was observed for the case with 0.5 H Deflector. It was found that the optimal Deflector longitudinal position ratios were at - 0.500 for the advancing blade Deflector and - 1.204 for the returning blade Deflector, whereas the optimal height of Deflector was 1 H . The qualitative study revealed that the Deflector at optimal Deflector longitudinal position and height prevented the separated flow from entering the low pressure region between the Deflector and the turbine’s blade, reducing unfavorable negative torque on the turbine. Consequently, the turbine exhibited the highest coefficient of power of 0.26 with a significant improvement of 100% relative to without the Deflectors.
Mabrouk Mosbahi - One of the best experts on this subject based on the ideXlab platform.
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performance study of a helical savonius hydrokinetic turbine with a new Deflector system design
Energy Conversion and Management, 2019Co-Authors: Mabrouk Mosbahi, Ahmed Ayadi, Youssef Chouaibi, Zied Driss, Tullio TucciarelliAbstract:Abstract The use of renewable energy sources has becoming a necessity to generate electricity. Helical Savonius rotors have been preferred for small-scale hydropower generation. Numerous studies were carried out to improve the performance of the Helical Savonius rotor which has not been fully explored. In this paper, an experimental study was carried out to evaluate the performance of a Helical Savonius water rotor in an irrigation channel. In order to enhance the performance of the studied water rotor, a new Deflector system design was proposed. Different configurations of the proposed Deflector system were tested numerically using the commercial software ANSYS FLUENT 17.0. Without a Deflector system, the maximum power coefficient is found to be equal to 0.125 at tip-speed ratio of 0.7. Using the optimal configuration of the new Deflector system, the maximum power coefficient reaches 0.14. The utilization of this new design system is predicted to contribute towards a more efficient use of flows in rivers and channels for electricity production in rural areas.
T I Eldho - One of the best experts on this subject based on the ideXlab platform.
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performance study of modified savonius water turbine with two Deflector plates
International Journal of Rotating Machinery, 2012Co-Authors: Golecha Kailash, T I Eldho, S V PrabhuAbstract:Savonius rotor is a vertical axis rotor with simple in design and easy to fabricate at lower cost. The rotation of the rotor is due to the drag difference between the advancing blade and returning blade. Net driving force can be increased by reducing the reverse force on the returning blade or increasing the positive force on the advancing blade. Former can be realized by providing a flow obstacle to the returning blade and latter can be realized by concentrating the flow towards the advancing blade. The objective of the present work is to identify the optimal position of the Deflector plate (on advancing blade side) placed upstream to the flow which would result in increase in power generated by the rotor. Tests are conducted to identify the optimum position of the Deflector plate on the advancing blade side in the presence of a Deflector plate on the returning blade side at its optimum position. Results suggest that two Deflector plates placed at their optimal positions upstream to the flow increase the coefficient of power to 0.35. This is significantly higher than the coefficient of power of 0.14 observed for the rotor without Deflector plates.
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influence of the Deflector plate on the performance of modified savonius water turbine
Applied Energy, 2011Co-Authors: Kailash Golecha, T I Eldho, S V PrabhuAbstract:Abstract Savonius rotor is simple in design and easy to fabricate at a lower cost. The basic driving force of Savonius rotor is drag. The drag coefficient of a concave surface is more than the convex surface. Hence, the advancing blade with concave side facing the water flow would experience more drag force than the returning blade, thus forcing the rotor to rotate. Net driving force can be increased by reducing the reverse force on the returning blade. This can be realized by providing flow obstacle to the returning blade. The objective of the present work is to find out the optimal position of the Deflector plate upstream to the flow which would result in maximum power generated by the rotor. Experimental investigations are carried out to study the influence of the location of the Deflector plate on the performance of a modified Savonius rotor with water as the working medium at a Reynolds number of 1.32 × 10 5 . Eight different positions of the Deflector plate are attempted in this study. Results conclude that Deflector plate placed at its optimal position increases the coefficient of power by 50%. Maximum coefficient of power is found to be 0.21 at a tip speed ratio of 0.82 in the presence of Deflector plate. Two stage and three stage modified Savonius rotors are tested to study the influence of Deflector plate at the optimal position. Maximum coefficient of power improves by 42%, 31% and 17% with Deflector plate for two stage 0° phase shift, 90° phase shift and three stage modified Savonius rotor respectively.
