波浪锥型圆柱流固耦合振动机理研究

Fluid-structure coupled vibration mechanism of wave conical cylinder

为增强及控制无叶片风力俘能结构能量采集效率,该研究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,试验研究在雷诺数Re=3900下不同波长比、波幅比、斜率参数的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/D _(m)=1.75、波幅比α/D _(m)=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”漩涡脱落模式,并且“2P”漩涡脱落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的增大和发电效率的提升提供理论支持。

Here,to enhance and control energy collection efficiency of bladeless wind energy capture structure,the surface structure slope parameter was introduced into a wave type cylinder to develop a new type wave cone cylinder.Vortex induced vibration response characteristics of the wave cone cylinder with different wavelength ratios,wave amplitude ratios and slope parameters under Reynolds number Re=3900 were numerically and experimentally studied.It was shown that under conditions of different reduced flow rates,maximum amplitudes of the cone cylinder with slope k=0.05 and the wave cone cylinder with wavelength ratioλ/D _(m)=1.75,wave amplitude ratioα/D_( m)=0.10 and slope k=0.05 are 26.4%and 12.6%higher than that of straight cylinder,respectively,and their frequency locking intervals are expanded;when reduced flow rate is within frequency locked interval,“2S”and“2P”vortex shedding modes are observed in wake around the wave cone cylinder,and“2P”vortex shedding mode tends to change into“2C”one in its development process to downstream;the study can provide a theoretical support for further studying vortex induced vibration of bladeless wind energy capture structure and improving its power generation efficiency.