Topic
Savonius wind turbine
About: Savonius wind turbine is a research topic. Over the lifetime, 333 publications have been published within this topic receiving 6521 citations.
Papers published on a yearly basis
Papers
More filters
21 Jul 2017
TL;DR: In this paper, a new wind turbine, called resistance type vertical axial wind turbine (VAWT) with soft blades, was introduced to improve the aerodynamic performances of traditional VAWT.
Abstract: This article introduces a new wind turbine, called resistance type vertical axial wind turbine (VAWT) with soft blades. The blades of the new turbine resist the wind and collect the power along the wind direction, while canceled the resistance against the wind direction. The new work mechanism was conceived to improve the aerodynamic performances of traditional VAWT. To prove the above supposing, two wind turbine models with soft blades were set up to find the static torque coefficients by numerical study. The simulation results of both models were compared with the experiment data of Savonius wind turbines models with the same sweeping area. The simulation results showed that: 1) The comparison between experiment data and CFD analysis on the same Savonius wind turbine has the reliability; 2) The soft bladed VAWT produces no negative static torque and it starts normally under low wind speed condition.
Dissertation•
01 Jan 2020
TL;DR: In this paper, the performance of three bio-inspired wind turbine blades is investigated based upon the inconsistent wind speed in Malaysia due to the seasonal weather influence, and a novel blade design is being proposed to accommodate the wind speed potential of Malaysia.
Abstract: Energy harvesting signifies the development of industrial and power growth of economy and socio-economy in a region. The use of fossil fuels without proper regulation resulted in rise of greenhouse gases. Current wind turbine blades are designed to cater specific environment, geographical location and wind load. Hence, this resulted in poor and inadequate performance at inconsistent wind load regions such as Malaysia. Hence, design modification is being done on wind turbine blade morphology in order to adapt to various wind load environment. This aim of the present study is to investigate the performance of three proposed novel bioinspired wind turbine. Based upon the inconsistent wind speed in Malaysia due to the seasonal weather influence. Hence a novel blade design is being proposed to accommodate the wind speed potential of Malaysia. The proposed design is the product of design hybridization inspired by elements of nature. Thus, the theoretical computational fluid dynamic numerical investigation of the proposed turbines was conducted relative in 2D and based on theoretical assumption. Finite volume method approach was adapted to analyze the proposed turbines under non-conformal grid configuration. The proposed turbines are simulated under the similar computational configuration; numerical formulation; solver configuration. The transient numerical investigation is based on Unsteady Reynolds-averaged Naiver-Stokes equation and two equation turbulent transport numerical model. The turbines are analyzed in terms of power extraction coefficient (Cp), relative to Betz limit as benchmark. For simplicity the proposed turbines are labeled as Design 1; Design 2; Design 3. Design 1 is modelled in two scales which is large and microscale. Meanwhile Design 2 and Design 3 is modelled in microscale. The turbine is simulated under the influence of freestream velocity of 8 m/s as cut in speed for the turbines. Design 1 is simulated at five different low tip speed ratios. Results shows that the turbine responded well at λ = 0.2 and λ = 0.3 with positive power coefficient of Cp = 0.029 and Cp = 0.025 respectively which is relatively low in comparison to conventional drag driven turbines. Meanwhile, tip speed ratio, λ = 0.4, λ = 0.6 and λ = 0.9 indicated high instability in moment generation and high negative power extraction. Generated result indicates negative power coefficient which has impacted the performance of the turbine. The cavity vane experiences high adverse pressure due to its sharp cornered geometry in returning blade which consequently impacted the rotation of the advancing blade. Therefore, it is concluded that, design improvement needs to be done on the cavity vane geometry to ensure smooth transient in rotation without the blade affecting one another. As for Design 2 at λ = 1.3 the numerical oscillation stabilizes after 480° with an average stable peak value of Cm = 0.32. The average of total moment coefficient was Cm = 0.1886. Meanwhile, at λ = 1.7 the turbine generated an average moment coefficient value of Cm = 0.153991 and showed almost similar behaviour pattern as λ = 1.3 in wind energy extraction. The result showed that the proposed turbine with four blades composed of fixed AoA aerofoil NREL S819 performed well at λ = 1.3 and λ = 1.7 by generating a stable average power coefficient value of Cp = 0.245 and Cp = 0.262 respectively. Furthermore, the vorticity magnitude of each tip speed ratio was analyzed. It was observed that, wake effects induced by the trailing edge had affected the performance of the following blade. Meanwhile, Design 3 result shows that, design S-4 displayed numerical stability relative to the computational configuration and improved moment coefficient result compared to Savonius wind turbine. At λ = 0.59, the proposed wind turbine shows an improvement of 7.2% and reduces to 4% at λ = 0.94. Based on the computational fluid dynamic analysis of the proposed morphology indicates that design implementation via bioinspiration is liable but requires further analysis and experimental investigation for efficient and adaptive wind harvesting device.
01 Jan 2013
TL;DR: In this article, the authors proposed a hybrid concept combining solar cell panels and Savonius turbine to gain a greater electrical output than the solar cells panels and wind turbine that operate in their own task.
Abstract: ABSTRAK The use of fossil energy for conventional power plants in the long time will run out of oil, gas and coal reservoir. Therefore the renewable energy utilization that more environmentally friendly and renewable concepts such as wind and solar heat should be optimized. Two kind of potential renewable energy resources in Indonesia that should be optimized are wind power and solar energies. They will be complement each other, in the dry season the sun will be role while in the rainy season wind power will be more dominant. This hybrid concept combining solar cell panels and Savonius turbine to gain a greater electrical output than the solar cell panels and Savonius wind turbine that operate in their owntask. A Single stage Savonius wind turbines are made three design types to find the best design that can convert more energy from any wind direction. A solar cell panel is placed under the sun to produce current and voltage from sun light. The energy summation data will be recorded by Data Aquisition System. From The measurement and data analysis results, the electrical power generated by prototype of hybrid system is 7,5 watt. This value is greater if compare to the power generated by solar panels and