Design Cfd Analysis And Prototype Testing Of Brim Diffuser Shrouded Horizontal Axis Wind Turbine

In lower wind speed regions, the generation of electrical power from conventional small-scalernhorizontal axis wind turbines is very difficult due to ineffective power extraction in lower windrnspeed. However, the introduction of a flanged diffuser that shrouds the wind turbine is used tornincrease and accelerate the wind speed that approach to wind turbine. This will permit extractrnefficient power at lower wind speed regions. This research addresses the design, optimization,rnmodel 3D Print or manufacturing, and experimental testing of a model diffuser augmented windrnturbine. rn2D CFD simulations were carried out to examine an optimum geometry of brim diffuser byrnutilizing different optimization techniques. All samples have the same dimensions in diffuserrnlength, entrance area, exit area, and brim (or flange) length but they vary in sectional shape ofrndiffuser and flange angles. Brim angles of these tested samples vary from rn0rn20rnto rn0rn20 .The rnsimulation shows that the curve sectional shape of a brimmed diffuser increases the velocity ofrnthe approaching wind speed by 7.06 % when compare to straight sectional shape. And also, fromrndifferent flange angles for the curved sectional shape of brim diffuser, 10rn0rn flange angle improve rnthe velocity augmentation by 4.07 % when compared to normal flange angel. Besides numericalrnresult shows that the boundary layer flow separation points along inside of a diffuser greatlyrnaffect the acceleration of wind flow through a brimmed diffuser. rnSubsequently, a MATLAB code is developed to optimize the blade twist angle and chordrndistributions. After this, the performance analysis of the optimized brim diffuser shroudedrnhorizontal axis wind turbine is analyzed by using ANSYS- FLUENT. The CFD result showsrnthat the optimized shrouded wind turbine increases the velocity and power augmentation by arnfactor of 1.58 and 3.78 respectively when compared to the performance of an unshrouded windrnturbine with the same swept area and wind speed. Lastly, the prototype of shrouded turbine isrnmanufactured and test its performance in the wind tunnel in the Addis Ababa Institute ofrnTechnology’s laboratory. The experimental result is verified with numerical result withrnreasonable small deviation which will be suitable for the implementation of a shrouded turbinernfor lower wind speed regions for rural electrification.

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