Experimental Investigation of Flow-Induced Motion and Energy Conversion for Two Rigidly Coupled Triangular Prisms Arranged in Tandem

Abstract

A series of experimental tests on flow-induced motion (FIM) and energy conversion of two rigidly coupled triangular prisms (TRCTP) in tandem arrangement were conducted in a recirculating water channel with the constant oscillation mass mosc. The incoming flow velocity covered the range of 0.395 m/s ≤ U ≤ 1.438 m/s, corresponding to the Reynolds number range of 3.45 × 104 ≤ Re ≤ 1.25 × 105. The upstream and downstream triangular prisms with a width of 0.1 m and length of 0.9 m were connected by two rectangular endplates. Seven stiffness (1000 N/m ≤ K ≤ 2400 N/m), five load resistances (8 Ω ≤ RL≤ 23 Ω), and five gap ratios (1 ≤ L/D ≤ 4) were selected as the parameters, and the FIM responses and energy conversion of TRCTP in tandem were analyzed and discussed to illustrate the effects. The experimental results indicate that the “sharp jump” phenomenon may appear at L/D = 2 and L/D = 3 significantly, with substantially increasing amplitude and decreasing oscillation frequency. The maximum amplitude ratio in the experiments is A*Max= 2.24, which appears after the “sharp jump” phenomenon at L/D = 3. In the present tests, the optimal active power Pharn = 21.04 W appears at L/D = 4 (Ur= 12.25, K = 2000 N/m, RL= 8 Ω), corresponding to the energy conversion efficiency ηharn= 4.67%.

Experimental study on flow-induced motion and energy conversion for two triangular prisms in tandem arrangement

“…Furthermore, numerical models were used to research and analyze the effect of aspect ratio on rectangular cylinders in a flow of 0.1-2.5 m/s. The oscillation responses and energy conversion of two rigidly coupled triangular prisms in a tandem arrangement were tested by Lian et al (2022). Stiffness, spacing ratio, and load resistance were considered, and a maximum amplitude ratio of A* max = 2.24 and maximum active power of P harn = 21.04 W were achieved in the experiments.…”