为增强及控制无叶片风力俘能结构能量采集效率，本文将表面结构斜率参数引入波浪型圆柱，发展了一种新型波浪锥型圆柱，数值及实验研究雷诺数Re=3900下不同波长比、波幅比及斜率参数波浪锥型圆柱涡激振动响应特性。研究发现：在不同折合流速下，斜率k=0.05的锥型圆柱和波长比λ/Dm=1.75、波幅比α/Dm=0.10、斜率k=0.05的波浪锥型圆柱最大振幅较直圆柱分别增长26.4%和12.6%，且锁频区间得以拓展；当折合流速在锁频区间内时，在波浪锥型圆柱绕流尾流中观察到了“2S”、“2P”涡脱模式，并且“2P”涡脱模式在往下游发展的过程中有转变为“2C”模式的趋势。该研究可为无叶片风力俘能结构涡致振动和发电效率的提升提供理论支持。
Abstract
In order to enhance and control the energy collection efficiency of the bladeless wind energy capture structure, this paper introduces the slope parameter of the surface structure into the wave-shaped cylinder, and develops a new type of wave-cone-shaped cylinder. Numerical and experimental research on the response characteristics of wave-cone cylindrical vortex-induced vibration with different wavelength ratio, wave amplitude ratio and slope parameters under Reynolds number Re=3900. The study found that at different reduced flow rates, the cone cylinders with slope k=0.05 and the wavy cone cylinder with wavelength ratio λ/Dm =1.75, wave amplitude ratio α/Dm =0.10, slope k=0.05 have the maximum amplitude ratio increased, compared with the straight cylinder, the maximum amplitude increases by 26.4% and 12.6% respectively, and their frequency lock range can be expanded. When the reduced flow velocity is in the locked frequency range, “2S” and “2P” vortex detachment modes are observed in the wake of the wave-conical cylindrical flow, and the “2P” vortex detachment mode tends to change to “2C” mode as it develops downstream. This research can provide theoretical support for the vortex-induced vibration of bladeless wind energy capture structures and the improvement of power generation efficiency.
关键词
波浪锥型圆柱 /
流固耦合 /
涡激振动 /
增振 /
数值计算
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Key words
wavy cone cylinder /
fluid-structure coupling /
vortex-induced vibration /
increase vibration /
numerical simulation
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