Temporal evolution of lift in a pure cruciform system for energy harvesting

被引：2

作者：

Adzlan, Ahmad ^{[1
,2
]}

Ali, Mohamed Sukri Mat ^{[1
]}

Zaki, Sheikh Ahmad ^{[1
]}

机构：

[1] Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Kuala Lumpur 54200, Malaysia

[2] Univ Malaysia Sarawak, Fac Engn, Sarawak 94300, Malaysia

来源：

OCEAN ENGINEERING | 2021年 / 223卷

关键词：

Vortex-induced vibration; Vibration energy harvester; CFD simulation; Streamwise vorticity; Ensemble empirical mode decomposition (EEMD); Hilbert transform; 2; CIRCULAR-CYLINDERS; SQUARE CYLINDER; MASS-RATIO; FLOW; DOWNSTREAM; EXCITATION; MOTIONS;

D O I：

10.1016/j.oceaneng.2021.108648

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

We investigated the displacement and lift time series of a circular cylinder - strip plate cruciform system for energy harvesting in the Reynolds number range 1.1 x 10(3) <= Re <= 14.6 x 10(3), numerically using the open source C++ library: OpenFOAM. The Karman vortex-induced vibration (KVIV) regime was identified between reduced velocity, LP, 2.3 and 13.6, while the streamwise vortex-induced vibration (SVIV) regime was identified between 18.2 <= U* <= 29.5. We analysed the cylinder displacement and lift time series using the Hilbert-Huang transform (HHT). Within this range of U*, Karman vortex shedding contributes nearly as much as streamwise vortex shedding to the root-mean-square amplitude of total lift, while between 25.0 <= U* <= 29.5, the Karman component contribution is on average twice that of the streamwise component. These findings hint at the pos- sibility to improve the power output of the harvester by a factor of two between 18.2 <= U* <= 22.7 and by a factor of three between 25.0 <= U* <= 29.5, if we can unite the contribution to the root-mean-square amplitude of the total lift under a single vibration-driving mechanism: the shedding of streamwise vortex.

引用

页数：16

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