T形截面振子的流致振动特性试验研究

近年来人们将流致振动(FIV)作为一种新的能源利用手段,针对圆柱型振子开展了较多的研究。随着研究的深入,发现异型截面振子因振动特性不同于圆柱型振子而具有更好的能量汲取特性。本文利用自循环水槽进行T形截面振子流致振动特性试验研究,对比研究T形振子与圆柱振子的流致振动响应差异,分析其能量捕获能力的优劣及适用范围,以期揭示阻尼比对T形振子的振动特性的影响。结果表明:不同于圆形截面振子,T形截面振子的振动表现为"非自限制"特性,出现驰振分支;增大阻尼会抑制T形截面振子的振动与驰振发生的可能性;相对于圆柱型振子而言,T形振子更适用于大流速下的能量汲取。

Experimental Study of Flow-Induced Vibration Characteristics of T-shape Cross-Section Oscillator

In recent years,the flow-induced vibration (FIV) has been studied as a new means of energy utilization and a lot of studies were carried out for cylindrical oscillator.With the deepening of study,it is found that compared with cylindrical oscillator,special cross-section vibrator presents better energy capture performance due to its different vibration characteristics.Experimental study of FIV characteristics of T-shape cross-section oscillator was carried out in a self-circulating flume.FIV response difference between T-shape cross-section oscillator and typical cylindrical oscillator was compared.Both advantage and disadvantage of energy capture ability and its application scope were analyzed,and the influence of damping ratio on FIV characteristics of T-shape cross-oscillator was revealed.Results show that the vibration response of T-shape cross-section oscillator is different from cylindrical vibrator due to its "non self-limiting" characteristic,and appears galloping bifurcation.The increase of damping can inhibit the vibration of T-shape oscillator and the possibility of galloping appearing.Relative to cylindrical vibrator,T-shape oscillator is more suitable for energy capture in higher flow rate situation.