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In this mechanical projects on design and analysis package, Computational Fluid Dynamics (CFD) software was used to compare the performance of a handmade wind turbine blade with that of a conventional factory made model. The geometry was simplified to 2D aero foils and the surrounding flow field was analyzed at a Reynolds’s number of 80,000. It was found that the lift/drag characteristics of the two aero foils across a range of angles of attack were virtually identical, meaning that the torque force exerted on the wind turbine blades would also be identical and therefore as would the power outputs of the two turbines. Small scale wind turbines can be used to provide power to remote areas of the developing world that are far away from any existing electrical grid system. The electricity they supply can be used to provide light in the mornings and evenings which can allow children to study and further their opportunities in later life or adults to continue working and provide that little bit of extra income for their families that could allow them to work their way out of poverty. Unfortunately, at a cost of thousands of pounds, factory built small scale wind turbines are expensive, even for reasonably well off citizens of the developed world. However, it is possible to build small scale wind turbines by hand, using basic workshop tools and techniques .This analysis will give the clear idea about how the hand made wind turbines are efficient as compared to factory made turbines.

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Computational Fluid Dynamics (CFD) is a powerful tool used to model the real life behaviour of fluids. It allows the optimisation of design parameters without the need for the costly testing of multiple prototypes. What is more, it is also a powerful graphical tool for visualising flow patterns that can give insight into flow physics that otherwise would be very difficult and costly to discover experimentally, if possible at all. Governing equations exist to model fluid behaviour, but it is not always possible to apply them to many of the complex flow patterns we see in the real world directly as there would be too many unknown variables. However, CFD involves creating a computational mesh to divide up real world continuous fluids into more manageable discrete sections. The governing equations for fluid flow can then be applied to each section individually, but as the properties of each section are inevitably linked to its neighbouring sections, all the sections can be solved simultaneously until a full solution for the entire flow field can be found. This method obviously requires a huge amount of computational power, nevertheless with the advancement of modern computing, solutions that would take months to compute by hand can now be found in seconds using nothing more than an ordinary desktop or laptop computer.


The mechanical projects modelling process consists of first taking the real world fluid geometry and replicating this in the virtual environment. From here, a mesh can be created to divide the fluid up into discrete sections. Boundary conditions must then be entered into the model to designate parameters such as the type of Conventional aerofoil geometries, with their characteristics and applications. of fluids to be modelled or the details of any solid edges or flow inlets/outlets. The simulation is then ready to be run and when a converged solution is found, it must be carefully analysed to establish whether the mesh is appropriately modelling the flow conditions. Generally, some form of mesh refinement will be necessary to put in further detail around the areas of interest.


CFD allows virtual experimentation with and consequently optimisation of the design parameters such as airfoil shape or angle of attack across a wide range of operating conditions. It is very attractive to industry as it saves both time and effort during the design process when compared alongside traditional experimental methods. However, the degree of confidence in the results is dependent on many factors and as a result; data should be compared with and validated against experimental findings wherever possible.

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A number of different turbulence models were suitable candidates for modeling the flow over a 2D aerofoil. The k-ε RNG and k-ω SST models are both popular choices, however during preliminary modelling it was found that the S-A (Spalart-Allmaras) model most accurately predicted the lift and drag characteristics of the NACA0012 aerofoil. The S-A model was designed specifically for low- Reynold’s number aerospace calculations and has been shown to give good results when simulating boundary layers subjected to adverse pressure gradients.. Due to the turbulent nature of the physical flow conditions that are being modelled close to and beyond the stall angle, complex time-varying simulations would be required to correctly simulate this behaviour. As a result, the data obtained from this simple steady-state model in this region cannot be considered reliable. With regards to the drag coefficient, it demonstrates that the S-A model gives a far better match to the experimental data. As a result, it was decided to use the SA turbulence model for the main analysis.


In this design and analysis mechanical projects , Using the validated model, simulations were run of the factory made wind turbine blade tip aerofoil alongside of hand made wind turbine blade tip aerofoil. The angle of attack was varied between 0° and 15° at a Reynold’s number of 80,000. This would seem to suggest that wind turbines using either of these profiles would produce similar amounts of power.


From this mechanical projects its is clearly indicates that the performance of the two wind turbine blade tip aerofoils is virtually identical. This result is highly unexpected as the geometries of the two aerofoils are very different. This would seem to suggest that wind turbines using either of these profiles would produce similar amounts of power. The homemade aerofoil is a far simpler shape to manufacture, as the lower surface is effectively a flat surface and therefore it is a far more appropriate design for low cost hand manufacturing as virtually no performance is sacrificed.

From this mechanical projects on design and analysis package ,Homemade wind turbine has been shown to have comparable performance to that of a Factory made wind turbine. In the simplified model of the aerofoils at the blade tips, both exhibited virtually identical lift and drag characteristics, implying that the torque force exerted on the blades and consequently the power produced by the turbine would also be identical. However, the simple model neglects many important factors such as 3D effects, geometric variations deriving from manufacturing defects and the location of the transition point. As a result, further modelling and/or experimental work is required to give more confidence in the results of this study.



This is Mr.Jose John, 21 yrs old guy, currently pursuing final year mechanical engineering, now become an enthusiastic blogger and a successful entrepreneur.
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