Performance Assessment of a New Geometry for Savonius turbines’s Blade

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Performance Assessment of a New Geometry for Savonius turbines’s Blade

ارائه دهنده: Provider: bahare saeedzade

اساتید راهنما: Supervisors: Dr.Mohsen goodarzi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr.sayehvand-DrAghighi

زمان و تاریخ ارائه: Time and date of presentation: 2022/1/2

مکان ارائه: Place of presentation: Virtual portal of the Faculty of Engineering

چکیده: Abstract: Vertical wind turbines are divided into two categories, Darius vertical wind turbine and Sonius vertical wind turbine. The Savonius turbine is notable for its advantages such as self-measuring torque, simple design, its ability to be used at different speeds and urban areas, and its independence from wind direction. But the problem with this type of turbine is its low efficiency. In recent decades, to solve this problem, solutions such as changing the overlap ratio of the blades, the dimensional ratio of the turbine and the deformation of the blade profiles have been used. The purpose of this study is to investigate the performance of the new geometry for the Savonius turbine blade. First, in this research, a conventional Savonius turbine was simulated in three tip speed ratios of 0.6, 0.8 and 1, and the solution method was validated. The validation solution conditions were applied to the new geometries of the Savonius turbine blade. This geometry is plotted by the two main parameters of angle α and length L. In this research, 17 new geometries of Sonius turbine blades were simulated in two dimensions and examined. New blade power coefficient, blade torque coefficient diagram, drag coefficient and blade coefficient diagram in this study were compared with conventional Savonius turbine blade in three tip speed ratios of 0.6, 0.8 and 1. The results showed that, at the tip Speed ratio of 0.8, The power factor of the blade (α = 3π / 8, L = R / 2) and (α = 3π / 8, L = R / 3) were 0.9406% and 1.078% higher than the power coefficient of a conventional Savonius turbine blade, respectively. The graph of drag and lift coefficients and oscillations of drag and lift coefficient showed that in the tip speed ratio of 0.8 and 1, the aerodynamic oscillations of the blades, whose power coefficient was close to the power coefficient of a conventional Savonius turbine, were less than the aerodynamic oscillations of a normal Savonius turbine blade

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