Energy Generation from Vortex Induced Vibrations

Energy Generation from Vortex Induced VibrationsGuided by : Mr . Anooplal B Asst. Professor , Mechanical Engineering Dept.St. Josephs College of Engineering and Technology , Palai .

Submitted by : Toji Tharakan S-7, Mechanical EngineeringContents Introduction Vortex Induced Vibrations Physics Theory Energy Harvesting In Liquid Flow Vortex Induced Vibration Aquatic Clean Energy (VIVACE) Energy harvesting in air flow Conclusion References IntroductionGlobal climate change induce a need for innovative energy harvesting devices

drawbacks of turbine generators urges emergence of a new area energy harvesting from flow induced vibration

A kind of flow-induced oscillations that can be useful to harvest energy from a flow is the Vortex-Induced Vibrations (VIV) of a bluff body

VORTEX INDUCED VIBRATIONSThe vibration caused by a fluid flowing around a body due to formation of vortices is known as vortex-induced vibration .

Vortexis a region of spinningmotion about an imaginary axis within afluidflow

Vortex-Induced Vibration (VIV) is important mechanical engineering - considered as an undesirable effect

We will see that if the vibration is substantial, it can be used to extract useful energy from the surrounding flow

Physics TheoryVortex Shedding

An oscillatingflow that takes place when a fluid flows past a cylindrical body at certain velocities .

Vorticesare created at the back of the body and detach periodically from either side of the body .

Alternating vortex shedding is referred as a vortex street

Dependent on the Reynolds number of the flow

Strouhal Number

Non-dimensional parameter relates the frequency of vortex shedding , fS , to the flow conditions .Strouhal number , S= (D *fs )/UU is the free stream velocity, and D is the cylinder diameter

Lock In Lock in can result in relatively large amplitudes of forced vibration.Similar to linear resonance.Increase in vibration amplitudes the natural frequency of the cylinder is approached by the vortex shedding frequency .

Application of Vortex Induced VibrationsElectromagnetic energy harvesting

Vortex Induced Vibrations Aquatic Clean Energy (VIVACE)

Vortex Shedding Vertical Axis Turbine (VOSTURB)

Piezoelectric Energy HarvestersEnergy Harvesting In Liquid Flow Electromagnetic energy harvesting from vibrations .

Vortex Induced Vibration Aquatic Clean Energy (VIVACE)

The VIVACE converter is a transformational technology.It taps into a vast new source of clean and renewable energy . water currents as slow as 2 to 4 knots(1.02 m/s to 2.05 m/s ) to conventional turbine technology that target rivers with water currents greater than 4 knots.

Open water testing in the St. Clair River, at Port Huron, MI in 2011

Can be used for Supply of electricity to offshore facilities without supplying diesel to generator sets.Replacement for dams without altering the riverine environment.Modular VIVACE units could be used and then removed and re-used at another site.

Comparison of VIVACE to other alternative energy sources

Comparison of energy sources

Comparison is done in terms of cost in $/kWhEnergy Harvesting in Air FlowPiezoelectric Energy Harvesting

vertical rigid sail is fixed to a vertically cantilevered piezoelectric transducer.

Sail oscillates in a fixed direction when introduced to wind.

The piezoelectric transducer bends back and forth .

Thus, through the direct piezoelectric effect, electricity is produced

Remote Sensing Applications .

Batteries or long power cords can be eliminated.

Savings in capital, maintenance, or labour costs.

Power is either continuously provided to the sensor or stored in a small battery or capacitor

ConclusionEnergy harvesters from flow-induced vibration, is an alternative to turbine generators .

Focus should be to miniaturise these energy harvesters while maintaining current power level.

Additional researches should be done to further reduce the start flow speed to allow this technology wider application

References1. Dung-An Wang ; Chun-Yuan Chiu and Huy-Tuan Pham ; Electromagnetic energy harvesting from vibrations induced by Karman vortex street ; Mechatronics ; Volume 22 ; 2012 ; pages 746756;

2. D.A. Wang and K.H Chang ; Electromagnetic energy harvesting from flow induced vibration ; Microelectronics Journal ; Volume 41 ; 2010 ; pages 356364;

3. Antonio Barrero-Gil ; Santiago Pindado and Sergio Avila ; Extracting energy from Vortex-Induced Vibrations: A parametric study ; Applied Mathematical Modelling ; Volume36 ; 2012 ; pages 31533160 ;

4.Michael M. Bernitsas ; Kamaldev. Raghavan ; Y. Ben-Simon ; E. M. H. Garcia ; VIVACE(Vortex Induced Vibration for Aquatic Clean Energy):A NEW CONCEPT IN GENERATION OF CLEAN AND RENEWABLE ENERGY FROM FLUID FLOW ; Journal of Offshore Mechanics and Arctic Engineering ; 2008 ;

5. Dibin Zhu ; Vibration Energy Harvesting: Machinery ,Vibration, Human Movement and Flow Induced Vibration ; University of Southampton ,UK .

5. Dibin Zhu ; Vibration Energy Harvesting: Machinery ,Vibration, Human Movement and Flow Induced Vibration ; University of Southampton ,UK .

6. Bruder and Brittany Lynn ; Assessment of hydrokinetic renewable energy devices and tidal energy potential at Rose Dhu Island, GA ; August 2011 .

7. C.H.K. Williamson ; and R. Govardhan ; A brief review of recent results in vortex-induced vibrations ; Journal of Wind Engineering and Industrial Aerodynamics ; Volume 96 ; 2008 ; pages 713735 .

8. Philippe Meliga ; Jean-Marc Chomaz ; and Franc -ois Gallaire ; Extracting energy from a flow: An asymptotic approach using vortex-induced vibrations and feedback control ; Journal of Fluids and Structures; Volume 27 ; 2011; pages 861874 .

9. Ashwin Vinod ; Amshumaan ; Kashyap ; Arindam Banerjee ; and JonathanKimball; Augmenting Energy Extraction FromVortexInduced Vibration Using Strips Of Roughness/Thickness Combination ; Proceedings of the 1st Marine Energy Technology Symposium , METS13 ; April 1011, 2013 ;

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