html5-img
1 / 24

Experimental and Numerical Study of Radial Flow

Experimental and Numerical Study of Radial Flow. D. Micallef, B. Akay, T. Sant, C. S. Ferreira, G. Van Bussel Presenter: Daniel Micallef Date: 17/03/2011. Presentation Overview. Introduction Previous work The SPIV experiment Numerical simulation Results Conclusions and contributions.

hazina
Télécharger la présentation

Experimental and Numerical Study of Radial Flow

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Experimental and Numerical Study of Radial Flow D. Micallef, B. Akay, T. Sant, C. S. Ferreira, G. Van Bussel Presenter: Daniel Micallef Date: 17/03/2011

  2. Presentation Overview • Introduction • Previous work • The SPIV experiment • Numerical simulation • Results • Conclusions and contributions

  3. Introduction • The objectives of this work were the following: • Understand flow three-dimensionality of wind turbines • Understanding of the very near wake evolution • Investigate the relevance of radial flows to wind turbine designers • Study concerns flow outside of the boundary layer

  4. Introduction • To this end, both an experimental and numerical study were performed: • Potential flow, 3D unsteady panel model • SPIV experiment

  5. Previous Work • Ebert et al. – Hot-wire measurements. Radial velocities (at a position x/c = 1.67) λ = 4

  6. Previous Work • Sant et al. – NREL UAE Phase VI experimental dataset used in a free-wake lifting line model λ = 7.6 λ = 2.91 λ = 1.52 a3,c r/R

  7. SPIV Experiment • SPIV setup for measurements along the spanwise direction: Laser Turbine Cameras

  8. SPIV Experiment Laser sheet Turbine Laser Cameras

  9. SPIV Experiment • Experimental conditions: • Wind speed 6m/s • RPM 400 • Tip speed ratio of 7 • Thrust coefficient of 0.87 • Power coefficient 0.44

  10. Numerical Simulation • Solves for the source and doublet distribution on panels representing the body and wake.

  11. Numerical Simulation

  12. Numerical Simulation • Model used is: • Three-dimensional • Unsteady • Potential flow without any stall model • The experimental tip speed ratio was simulated (attached conditions)

  13. Numerical Simulation • Verification tests (convergence tests shown here at 50% span):

  14. Results • Radial velocity results on a horizontal plane.

  15. Results • Video radial velocities behind the turbine

  16. Results • Snapshot comparisons between simulation and experiment: 80 degrees

  17. Results • 90 degrees

  18. Results • 100 degrees

  19. Results 97 deg 95 deg 99 deg

  20. Results • Load comparison from panel model

  21. Results • The force in the spanwise direction is small. • Radial velocities however also impact the thrust force due to the wake dynamics. • These effects still need to be clarified.

  22. Conclusions and contributions • Experimental observations very close to the rotor plane were performed using SPIV • Spanwise loads were confirmed to be small compared to the other force components • A slight wake contraction just behind the rotor plane was observed experimentally. Numerical results also show a delayed expansion.

  23. Conclusions and contributions • Future work plans: • Chordwise experimental measurements • Study of the yawed flow situation. Radial components are expected to be higher due to the flow asymmetry leading to more complex wake kinematics

  24. Thank you!

More Related