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Results Contain the reading obtained on three consecutive days
The graph show the trends of lift force against the wind velocity
CFD results are in good agreement with the experimental result, the trends are also similar as shown in the graph.
The trends of lift and drag for different RPMs, show increasing lift at higher rpms, but that is compensated by the power consumed
The lift value for the airfoil at same reynolds number is low but this high lift of the rotating cylinder will be compensated by the power consumed. Also the lift to drag ratio will be higher for airfoil
Based on our experience with the experiment and CFD, we have reached to following conclusions regarding the future possibilities and possible points of inaccuracies:-
1. The mechanism used by us has many source of friction & leakage and the degrees of freedom of the cylinder could have been restricted accurately than the method we have used currently.
2. Also the drag measurement was more difficult with this method because holding the weighing balance in horizontal position is more difficult.
3. The project can be further extended to experiment of splined, spiral or conical rotors to check if higher lift drag ratio is obtained or not. The combination of airfoil and Magnus effect as shown in the previous slides can also be used. In a basic CFD carried out for a splined rotor, we obtained a lift of 2.54 N compared to 1.6 N at 10 m/s for simple cylinder.
4. Magnus effect is found to be more useful in the lower wind speed range than in the higher range. Though lift obtained at higher speed is more, but the lift drag ratio is higher at the lower wind speed. So instead of replacement of airfoil it should be looked as the alternative to be used in smaller areas like farms, parks etc.
5. Higher power consumption should also be focused. Better selection of motor, optimum use of motor power can be taken into attention. DC motors are also an option, as they provide better speed control. Another method to check is to make the full scale model of the Magnus effect turbine check for the net power generated.
Thank You
CFD Results Summarized
Pressure distribution
around the cylinder (10 m/s)
Comparison of lift value for airfoil
and rotating cylinder
Airfoil Lift and Drag Data
Lift Force and drag report
Observations
Graphs
Trends obtained by researchers
The trends extended at higher Reynolds number with the help of CFD
Graphs
Conclusion
Magnus Effect applied to Wind turbine