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紫藤萝复叶气动特性的风洞实验研究

俞科杰 邵传平

俞科杰, 邵传平. 紫藤萝复叶气动特性的风洞实验研究[J]. 力学学报, 2019, 51(1): 245-262. doi: 10.6052/0459-1879-18-140
引用本文: 俞科杰, 邵传平. 紫藤萝复叶气动特性的风洞实验研究[J]. 力学学报, 2019, 51(1): 245-262. doi: 10.6052/0459-1879-18-140
Yu Kejie, Shao Chuanping. WIND TUNNEL INVESTIGATION OF THE AERODYNAMIC CHARACTERISTICS OF PURPLE WISTERIA COMPOUND LEAVES[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(1): 245-262. doi: 10.6052/0459-1879-18-140
Citation: Yu Kejie, Shao Chuanping. WIND TUNNEL INVESTIGATION OF THE AERODYNAMIC CHARACTERISTICS OF PURPLE WISTERIA COMPOUND LEAVES[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(1): 245-262. doi: 10.6052/0459-1879-18-140

紫藤萝复叶气动特性的风洞实验研究

doi: 10.6052/0459-1879-18-140
基金项目: 1)国家自然科学基金资助项目(11172286).
详细信息
    作者简介:

    作者简介: 2)邵传平,教授,主要研究方向:流动控制,植物力学.E-mail:shaocp@cjlu.edu.cn

  • 中图分类号: V211.74;

WIND TUNNEL INVESTIGATION OF THE AERODYNAMIC CHARACTERISTICS OF PURPLE WISTERIA COMPOUND LEAVES

  • 摘要: 树叶的形状重构和减阻能力在太阳能帆板、机翼结构、仿生天线设计和新型发电技术等方面具有应用价值.紫藤萝羽状复叶垂直悬挂于风洞中,在风速0~25m/s范围内进行正面和反面迎风测试.发现存在前期稳定、中间过渡和后期稳定3个阶段以及5个临界风速.在前期阶段叶轴随风速弯曲变化剧烈,出现小叶分层飞翼和分层多形状稳定.过渡阶段出现叶轴大幅低频振动和部分小叶小幅高频振动两种不稳定形式.后期出现两层或单一整体稳定,横截面形状分为锥形、楔形和U形.随着风速增大,复叶宽度减小,小叶层数逐步减少,直至出现流线形单一整体.随着雷诺数增大,复叶阻力系数先是快速下降,后又缓慢地趋于常数.复叶Vogel负指数绝对值$\vert \alpha \vert$随小叶数目的增大而增大.反面迎风时$|\alpha|$比正面迎风时大,但随着小叶数目增加两者趋于一致.当复叶旋涡脱落频率与叶轴固有频率接近时,叶轴出现大幅振动.理论分析得到叶轴振动的第二临界风速$V_2/\sqrt{E/\rho}$是$b/l$和$d/l$的函数,其中$E$,$\rho$,$d$和$l$分别为叶轴弹性模量、密度、直径和长度,$b$为变形后的复叶宽度,并由实验数据得到了其变化图.

     

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  • 刊出日期:  2019-01-18

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