Study And Design Of Multi-Blade Wind Energy Conversion System

Wahyono Sapto, Widodo (2013) Study And Design Of Multi-Blade Wind Energy Conversion System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project was performed to study and design a VAWT rotor blade and the gearbox to produces 5 kW of electrical power. This project mainly focuses on Savonius wind turbine. The wind speed distribution was observed and the wind energy site was set at Melaka, Malaysia. The relevant design parameters for designing Savonius rotor blade were studied in this report. The Savonius rotor was designed with the rotor diameter of 3.5 m and rotor height of 7 m. The rotor blade thickness was designed as 10 mm. SolidWorks was the design software used in this project. The material chosen for the rotor blade was E-glass fiber composite. Pressure difference between the concave and convex blade surface of Savonius rotor induced to drag force that turn the blade. The pressure difference was obtained by implement Computational Fluid Dynamics (CFD) analysis on SolidWorks Flow Simulation. The two flow types in this project were external flow and internal flow analysis. Both analyses were static analysis. Aerodynamic analysis was performed in manually to obtain the resultant drag force on the rotor blade. The resultant drag force obtained was 595.98 N and this value was used in Finite Element Analysis (FEA) to test the structural reliability. The FEA was performed by SolidWorks Simulation and the result was interpreted in three aspects: stress, deformation and Factor of Safety (FoS). The model with blade thickness of 10 mm was found to be able to withstand the load from wind speed of 7 m/s. The wind turbine gearbox has been designed in three stages which are one stage of planetary gear and two stages of parallel gears. Some theories regarding to the machine element design and structural design have been applied to determine the shaft diameter, number of teeth of the gear, module of the gear, gear ratio and the number gear stages. The wind turbine gearbox has been designed to increase the speed from 60 rpm to 1280 rpm with the gear ratio of 1:21.

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