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Enhancement of wave energy absorption efficiency via geometry and power take-off damping tuning

Jin, Siya; Patton, Ron J.; Guo, Bingyong

Authors

Siya Jin

Bingyong Guo



Abstract

In this work a three dimensional computational fluid dynamic (CFD) model has been constructed based on a 1/50 scale heaving point absorber wave energy converter (PAWEC). The CFD model is validated first via wave tank tests and then is applied in this study to investigate the joint effects of device geometry and power take-off (PTO) damping on wave energy absorption. Three PAWEC devices are studied with the following geometrical designs: a cylindrical flat-bottom device (CL); a hemispherical streamlined bottom design (CH) and a 90°-conical streamlined bottom structure (CC). A PTO force via varying damping coefficient is applied to compare the power conversion performances of the aforementioned devices. Free decay, wave-PAWEC interaction and power absorption tests are conducted via the CFD model. The results show that for CH and CC designs the added mass and hydrodynamic damping decrease by up to 60% compared with the CL device. Moreover, the CC design is the best of the three structures since its amplitude response increases by up to 100% compared with the CL. Applying an appropriate PTO damping to the CC device prominently increases the achievable optimal power by up to 70% under both regular and irregular waves (compared with the CL device).

Citation

Jin, S., Patton, R. J., & Guo, B. (2019). Enhancement of wave energy absorption efficiency via geometry and power take-off damping tuning. Energy, 169, 819-832. https://doi.org/10.1016/j.energy.2018.12.074

Journal Article Type Article
Acceptance Date Dec 11, 2018
Online Publication Date Dec 15, 2018
Publication Date Feb 15, 2019
Deposit Date Feb 26, 2020
Journal Energy
Print ISSN 0360-5442
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 169
Pages 819-832
DOI https://doi.org/10.1016/j.energy.2018.12.074
Keywords Wave energy conversion; co-design; joint effects of geometry and PTO damping; CFD model; power absorption efficiency; regular and irregular waves
Public URL https://hull-repository.worktribe.com/output/3446499



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