Hydrokinetic energy conversion from flow-induced motion by two rigidly coupled triangular prisms with variable excitation voltage

Chao Ma, Zhichuan Wu, Xiang Yan, Peiyao Li, Nan Shao, Fang Liu and Xiaoqun Wang

Energy, 2025, vol. 322, issue C

Abstract: Flow-induced Motion (FIM) of two rigidly coupled triangular prisms (TRCTP) with variable excitation voltage are experimentally investigated to examine the effects of parameters on hydrokinetic energy conversion. The prisms are arranged in tandem and side-by-side with different spacing ratio. The incoming flow (U = 0.47m/s-1.36 m/s) covers the Reynolds number range of 40618≤Re ≤ 118885 in TrSL3 (Transition in Shear Layer, 20000≤Re ≤ 200000). A controllable magnetic damping system is applied to change the total damping ratio of the Flow-induced Motion Energy Conversion System (FIMECS) by varying excitation voltages VB (VB = 0V–100V). There are two types of TRCTP are studied to enhance the energy conversion of the system. The results contribute to a more comprehensive understanding on the flow-induced motion and energy conversion of two rigidly coupled prisms, and provide a foundation for future investigations in multiple prisms. The main findings can be summed as: (1) The significant “sharp jump” phenomenon appeared for L/D = 3 of TRCTP-TAN at Ur = 8–9. (2) The amplitude ratio of the TRCTP can reach A∗ = 2.51 (T/D = 2, K = 1400N/m, Ur = 10.5). (3) The maximum active power Pmax = 26W appears at T/D = 2, which is about 1.68 times that of the single triangular prism (Pharn = 15.47W), and the maximum energy conversion efficiency is ηmax = 18.32 % at T/D = 1 (VB = 100V, K = 1400N/m, Ur = 8).

Keywords: Flow-induced motion; Triangular prism; Excitation voltage; Energy conversion (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:322:y:2025:i:c:s0360544225013994

DOI: 10.1016/j.energy.2025.135757

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