正方形截面振子在不同来流方向的单自由度流致振动特性研究
发布时间：2018-11-21 11:32
【摘要】：在自循环水槽进行了正方形截面振子的流致振动试验研究,分析了不同来流角度下的振子响应特征,探讨了有利于能量转换的角度安排,阐释了系统刚度与质量因素对该响应的基本影响,并拟合得到了不同来流角度下的斯特罗哈尔数St。结果表明:来流角度为零条件下的振子响应为驰振主导,而来流角度非零条件下的振子响应为涡激振动主导;低流速时,来流角度大有助于振子对涡激振动能量的汲取,而高流速时,来流角度为零有助于振子对驰振能量的汲取;振动振幅受刚度与质量的影响显著,但频率则几乎不受刚度与质量的影响;来流角度为30°和45°时,St较接近,约0.14,来流角度为15°时,St约0.16。
[Abstract]:The fluid-induced vibration of a square section oscillator in a self-circulating flume is studied. The response characteristics of the oscillator at different flow angles are analyzed, and the angle arrangements conducive to energy conversion are discussed. The effects of system stiffness and mass on the response are explained, and the Strowhall number St. at different flow angles is obtained by fitting. The results show that the response of the oscillator with zero flow angle is dominated by galloping vibration, while the response of the oscillator under the condition of non-zero flow angle is dominated by vortex-induced vibration. At low velocity, the large angle of flow is helpful for the vibrator to absorb the vibrator energy of vortex-induced vibration, but at high velocity, the zero angle of flow is helpful for the vibrator to absorb the energy of galloping vibration. The vibration amplitude is significantly affected by the stiffness and mass, but the frequency is almost unaffected by the stiffness and mass. When the inflow angle is 30 掳and 45 掳, the St is close, about 0.14, and the St is about 0.16 when the incoming flow angle is 15 掳.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;
【基金】：基金项目:水力发电系统耦联动力安全及智能运行技术(2016YFC0401905)
【分类号】：O353.4
本文编号：2346839
[Abstract]:The fluid-induced vibration of a square section oscillator in a self-circulating flume is studied. The response characteristics of the oscillator at different flow angles are analyzed, and the angle arrangements conducive to energy conversion are discussed. The effects of system stiffness and mass on the response are explained, and the Strowhall number St. at different flow angles is obtained by fitting. The results show that the response of the oscillator with zero flow angle is dominated by galloping vibration, while the response of the oscillator under the condition of non-zero flow angle is dominated by vortex-induced vibration. At low velocity, the large angle of flow is helpful for the vibrator to absorb the vibrator energy of vortex-induced vibration, but at high velocity, the zero angle of flow is helpful for the vibrator to absorb the energy of galloping vibration. The vibration amplitude is significantly affected by the stiffness and mass, but the frequency is almost unaffected by the stiffness and mass. When the inflow angle is 30 掳and 45 掳, the St is close, about 0.14, and the St is about 0.16 when the incoming flow angle is 15 掳.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;
【基金】：基金项目:水力发电系统耦联动力安全及智能运行技术(2016YFC0401905)
【分类号】：O353.4
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