本文選題：串列雙圓柱　切入點(diǎn)：流致振動(dòng)　出處：《水電能源科學(xué)》2017年06期 　論文類型：期刊論文

【摘要】：為揭示不同間距比(L/D)下串列雙圓柱協(xié)同作用下的振動(dòng)特性,采用自循環(huán)水槽對(duì)等直徑協(xié)同運(yùn)動(dòng)的單自由度串列雙圓柱進(jìn)行了流致振動(dòng)試驗(yàn)研究。試驗(yàn)所采用的串列雙圓柱間距比L/D范圍為1~5,雷諾數(shù)Re范圍1×10~4~4×10~4,串列雙圓柱質(zhì)量比均為1.95。結(jié)果表明,L/D=1時(shí),在試驗(yàn)Re范圍內(nèi)串列雙圓柱產(chǎn)生較小幅度的振動(dòng);L/D=2時(shí),串列雙圓柱的振幅比A*在VIV上端分支初始段有陡降現(xiàn)象,其后隨Re的增大,振幅持續(xù)增大同時(shí)頻率開始下降,但測(cè)試范圍內(nèi)并未出現(xiàn)顯著的馳振特征;L/D=3~5時(shí),串列雙圓柱隨間距比L/D的增加,上游圓柱脫渦對(duì)下游圓柱的影響減弱,突顯出單圓柱的"自限制"渦激振動(dòng)特點(diǎn)。
[Abstract]:In order to reveal the vibration characteristics of tandem double cylinders under the synergistic action of L / D with different spacing ratios, The fluid-induced vibration test of a single degree-of-freedom tandem double cylinder with the coordinated motion of constant diameter in a self-circulating tank has been carried out. The experimental results show that the spacing ratio of the tandem two cylinders is 1 / 5, Reynolds number re is 1 脳 10 / 4 / 4 脳 10 / 4, and the mass of the tandem double cylinder is 1 脳 10 ~ (4) / 4 / L ~ (-1) / L ~ (-1) / L / D, respectively. The ratio is 1.95. The result shows that L / D = 1:00, In the range of test re, a small amplitude of vibration (L / D = 2:00) is produced by the tandem double cylinder. The amplitude of the tandem double cylinder drops steeply than that of A * at the initial stage of the upper branch of VIV, and then the amplitude increases with the increase of re, and the frequency begins to decrease. However, there is no obvious galloping characteristic of L / D ~ (3 ~ 5:00) in the range of measurement. The effect of desortex of upstream cylinder on downstream cylinder is weakened with the increase of the distance between two cylinders and the ratio of L / D, which highlights the characteristic of "self-limiting" vortex-induced vibration of a single cylinder.
【作者單位】： 天津大學(xué)水利工程仿真與安全國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51579173) 國家創(chuàng)新研究群體科學(xué)基金項(xiàng)目(51021004)
【分類號(hào)】：O32;O357.5

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