Enhancement of a Darrius Wind Turbine by Convergent Ducting System and Study the Effect of design Parameter

摘要

Objectives: This study is to suggest a wind power plant in urban areas where wind speed is low. Methods/Statistical Analysis: The wind turbine analysis and simulation using mathematical models built in MATLAB and numerically by ANSYS FLUENT 17.2 were utilization to study the air flow performance through the duct. Findings: The results for approaches give a good agreement. Angles, one of the principal geometric parameters that significantly affect the convergent performances a four dimensional contraction convergent duct with the same length (1 meter) but different input areas is considered. Numerical simulations and analyses results show that the ratio between velocities recorded in the inlet section and the free stream velocity increases with the increase open angle of the duct system. The power coefficient improved for the convergent duct with opening angle of 40° by 28.571%. Also from VAWT analysis, the influence of design parameters on the power factor was achieved. Blades number effect shows that when the blade number increases the power coefficient is high too, and it is noticed that the power coefficient is increased with the rotor radius. Application/Improvements: Ducted system utilization for increase the productivity of wind turbines with different configurations are facing the restriction of low wind speed and improved wind turbine output capacity.