TY - JOUR
T1 - Energy harvesting based on flow-induced vibration of a wavy cylinder coupled with tuned mass damper
AU - Zhao, Fuwang
AU - Wang, Zhaokun
AU - Bai, Honglei
AU - Tang, Hui
N1 - Funding Information:
This work is supported by Natural Science Foundation of Guangdong Province through grants 2021A1515010337 , National Natural Science Foundation of China (NSFC) through grants 12072382 and 91952107 , Shenzhen Science and Technology Program (grant No. GXWD20201231165807008 , 20200830220051001 ), Research Grants Council of Hong Kong under General Research Fund through grant 15218421 .
Funding Information:
From the above surveys, one can see that the key to improve energy harvesting through FIV of a bluff body lies in triggering or boosting VIV and/or galloping. A sinusoidal wavy circular cylinder, featured by sinusoidally varying the diameter along its spanwise direction, is perhaps one of the simplest approaches to modify the cylinder geometry. Although the wavy cylinder, when fixed, is able to reduce the fluid forces (Ahmed & Bays-Muchmore [20]; Bearman & Owen [21], Lam & Lin [22], Lam et al. [23], Lin et al. [24] and Bai et al. a&b [25,26]), FIV may occur once it is elastically supported (Zhang et al. [27] and Assi et al. [28]). This motivates us to explore the potential of energy harvesting by FIV of a wavy cylinder. To this end, a system consisting of an elastically supported wavy cylinder and a tuned mass damper (TMD) is proposed and examined in the present work. A range of geometry parameters (i.e., wavelength and wave amplitude) and TMD mass are considered. Experimental tests are conducted, together with theoretical modeling and computational-fluid-dynamics (CFD) simulations.This work is supported by Natural Science Foundation of Guangdong Province through grants 2021A1515010337, National Natural Science Foundation of China (NSFC) through grants 12072382 and 91952107, Shenzhen Science and Technology Program (grant No. GXWD20201231165807008, 20200830220051001), Research Grants Council of Hong Kong under General Research Fund through grant 15218421.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/11/1
Y1 - 2023/11/1
N2 - We investigate the flow-energy harvesting performance of a system consisting of a wavy cylinder and a tuned mass damper (TMD), through experiments, theoretical modeling and CFD simulations. The wavy cylinder is elastically supported, being able to oscillate transversally in cross flows and further enforcing a piezoelectric sheet to generate electricity. Results indicate that the output power strongly depends on wavelength λz, amplitude a, and the tip mass of TMD. The wavy cylinder outperforms the smooth cylinder when λz ≥ 3.6Dm and peaks at λz = 6.0Dm and a = 0.25Dm with an improvement of 70%. This superiority also exists in a wider range of reduced velocities, leading to a power increase of 121%. The behavior of the oscillation echoes the observations made on the energy. The flow field results reveal that at λz = 6.0Dm and a = 0.25Dm, hairpin vortexes with legs attaching on the two sides of the node are observed, producing a wide wake near the node while a narrow wake near the saddle. However, an opposite scenario is observed for the case with the worst performance, i.e., λz = 1.8Dm and a = 0.25Dm. The former wake distribution seems to create a larger pressure difference over the wavy cylinder, induce a larger oscillation and hence improve the power output.
AB - We investigate the flow-energy harvesting performance of a system consisting of a wavy cylinder and a tuned mass damper (TMD), through experiments, theoretical modeling and CFD simulations. The wavy cylinder is elastically supported, being able to oscillate transversally in cross flows and further enforcing a piezoelectric sheet to generate electricity. Results indicate that the output power strongly depends on wavelength λz, amplitude a, and the tip mass of TMD. The wavy cylinder outperforms the smooth cylinder when λz ≥ 3.6Dm and peaks at λz = 6.0Dm and a = 0.25Dm with an improvement of 70%. This superiority also exists in a wider range of reduced velocities, leading to a power increase of 121%. The behavior of the oscillation echoes the observations made on the energy. The flow field results reveal that at λz = 6.0Dm and a = 0.25Dm, hairpin vortexes with legs attaching on the two sides of the node are observed, producing a wide wake near the node while a narrow wake near the saddle. However, an opposite scenario is observed for the case with the worst performance, i.e., λz = 1.8Dm and a = 0.25Dm. The former wake distribution seems to create a larger pressure difference over the wavy cylinder, induce a larger oscillation and hence improve the power output.
KW - Energy harveser
KW - Flow-induced vibration
KW - Tuned mass damper
KW - Wavy cylinder
UR - http://www.scopus.com/inward/record.url?scp=85169784975&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2023.128584
DO - 10.1016/j.energy.2023.128584
M3 - Journal article
AN - SCOPUS:85169784975
SN - 0360-5442
VL - 282
JO - Energy
JF - Energy
M1 - 128584
ER -
