Numerical and experimental investigation of modified V-shaped turbine blades for hydrokinetic energy generation
| Autor: | Shashikumar C M, Vasudeva Madav |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tip-speed ratio
Materials science 060102 archaeology Turbine blade Aspect ratio Renewable Energy Sustainability and the Environment Rotor (electric) 020209 energy 06 humanities and the arts 02 engineering and technology Mechanics Edge (geometry) Turbine law.invention law Drag 0202 electrical engineering electronic engineering information engineering Torque 0601 history and archaeology |
| Zdroj: | Renewable Energy. 177:1170-1197 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2021.05.086 |
| Popis: | The Savonius rotor is one of the simple and cost-effective vertical axis drag type devices for hydropower generation. The main drawback of the Savonius hydrokinetic turbine is its low performance due to negative torque developed by returning blade profile. In this paper, the performance of modified V-shaped rotor blades with different V-angles ranging from 90° to 40°, by maintaining fixed edge length, arc radius and aspect ratio of 0.7 is investigated. The numerical analysis is carried out to estimate the optimum V-angle by maintaining 70 mm depth of water with an inlet velocity of 0.3090 m/s. The numerical study revealed that, for 80° V-angle rotor blade profile, the maximum coefficient of power was found to be 0.2279 at a tip speed ratio of 0.9. This optimum V-angle model was used for experimental analysis to study the effect of aspect ratio ranging from 0.7 to 1.75 using top, middle and bottom plates by maintaining 140 mm depth of water and inlet velocity of 0.513 m/s. The rotor blade with two endplates and one middle plate with an aspect ratio of 1.75 has shown a significant increase of performance by 86.13% at a tip speed ratio of 0.86 as compared to turbine blade with two endplates. |
| Databáze: | OpenAIRE |
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