Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading content…
Loading…
Transcript

1. We have performed an experiment on a rotating cylinder, to find the lift and drag values

2. We also attempted a CFD to compare experimental results.

3. Then we use the data for an airfoil available from the foil sim III software (provided by NASA) to compare the lift and drag values. The comparison parameter was Reynolds number

Specifics about the Experiment

1. Length of the Cylinder = 1000mm

2. Diameter of the cylinder = 52mm

3. Wind Tunnel Cross Section = 530mm x 600mm

4. Test wind speed range = 8 - 14 m/s

5. Cylinder rotational speed = 2600 rpm

6. Material of the cylinder was wood

7. Location - Heat Engines Lab, Mechanical Engineering Deptt, FTE, MSU

8. Motor Used - Induction motor, 1400 rpm

Details of CFD

1. K- epsilon Model was used for analysis

2. Cylinder rpm analysed - 2600 rpm, 3000 rpm, 5000 rpm, 7500 rpm, 10000 rpm

3. Wind speed tested - 2 m/s, 4 m/s, 8 m/s, 10m/s, 12 m/s, 14 m/s

To collect data for airfoil, foil sim III was used

The comparison parameter was Reynolds Number

Reynolds number range was 6000, 8000, 11000, 14000, 17000, 19000

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

Airfoil Data

Experimental Results

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

Foil Sim

CFD Specifics

Foil SIM User Interface

No. of Nodes - 59274

No. of Elements - 54505

Mesh - fine

Growth rate - 1.2

Model

Cylinder dia - 52 mm

Final Year Project Presentation

Coefficient and References

Experimental Setup

Wind Tunnel View

Setup of Motor and cylinder

Motor and pulley

Electronic Weighing Balance used for lift measurement

Investigation of Lift and Drag for a rotating cylinder and airfoil with outlook of wind turbine

Prepared by :-

Vaja Chintan (266)

Govani Parth (271)

Vachhani Birju (284)

Jaliya Hemraj (285)

Guided By

Dr. J.M. Prajapati

Objective

What we intended to do?

Our main objective was to understand the aerodynamics force in rotating cylinder and airfoil. For that we obtained the lift and drag values for a rotating cylinder in our wind tunnel and compare it with the CFD results. We also compared it with the lift and drag values for a normal airfoil. We used the wind speed values in the range 8-14 m/s which are common in wind turbines

Magnus Effect applied to Wind turbine

What is Magnus effect

Magnus effect describes the interaction between a moving fluid and a spinning body. When a fluid flows past a spinning body, its path is disrupted by shear interaction with the surface of

the body. As can be seen in figure, the flow decelerates near the side of the cylinder that has a stream wise translational velocity opposing the direction of the flow and accelerates near the side that has a stream wise translational velocity in the direction of the flow.

Learn more about creating dynamic, engaging presentations with Prezi