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Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack

Publication ,  Conference
Besem, FM; Kamrass, JD; Thomas, JP; Tang, D; Kielb, RE
Published in: Proceedings of the ASME Turbo Expo
January 1, 2014

Vortex-induced vibration is a fluid instability present in many areas, including offshore platforms, wind turbines, and turbomachinery. The vortices due to secondary flows exert an periodic unsteady force on the elastic structure, leading to potentially dangerous vibrations. Under certain circumstances, the shedding frequency can lock into the structure natural frequency and lead to limit cycle oscillations. These high amplitude vibrations can cause material fatigue, and are a common source of structural failure. This work uses a frequency domain, harmonic balance, CFD code to predict the lock-in of an airfoil at very high angles of attack. The natural shedding frequency is found using a delta phase per iteration method, and the lock-in region is identified by enforcing airfoil motion at different oscillation amplitudes and frequencies. The numerical results are successfully compared to experimental data from wind tunnel testing on a NACA0012 airfoil at deep stall conditions.

Duke Scholars

Published In

Proceedings of the ASME Turbo Expo

DOI

ISBN

9780791845776

Publication Date

January 1, 2014

Volume

7B
 

Citation

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Besem, F. M., Kamrass, J. D., Thomas, J. P., Tang, D., & Kielb, R. E. (2014). Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack. In Proceedings of the ASME Turbo Expo (Vol. 7B). https://doi.org/10.1115/GT2014-25648
Besem, F. M., J. D. Kamrass, J. P. Thomas, D. Tang, and R. E. Kielb. “Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack.” In Proceedings of the ASME Turbo Expo, Vol. 7B, 2014. https://doi.org/10.1115/GT2014-25648.
Besem FM, Kamrass JD, Thomas JP, Tang D, Kielb RE. Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack. In: Proceedings of the ASME Turbo Expo. 2014.
Besem, F. M., et al. “Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack.” Proceedings of the ASME Turbo Expo, vol. 7B, 2014. Scopus, doi:10.1115/GT2014-25648.
Besem FM, Kamrass JD, Thomas JP, Tang D, Kielb RE. Vortex-induced vibration and frequency lock-in of an airfoil at high angles of attack. Proceedings of the ASME Turbo Expo. 2014.

Published In

Proceedings of the ASME Turbo Expo

DOI

ISBN

9780791845776

Publication Date

January 1, 2014

Volume

7B