[关键词]
[摘要]
选用NACA0015翼型,在Re=1·10 4的条件下,采取正弦和分段函数两种不同的中弧线变形规律,通过对最大变形位置、变形幅值等参数的分析,揭示两种变形方式对于扑翼能量吸收效率的影响。研究表明: 两种变形方式均能带来扑翼能量吸收效率的提升,且最大变形位置越靠后,扑翼能在更大的变形幅值范围内获得能量吸收效率的提升;随着最大变形位置的后移,正弦形式取代分段函数形式成为一种较优的变形方式;正弦的中弧线变形方式降低了输出功率系数曲线的第二个峰值,但其大幅提升第一、二峰值之间区域的数值,故正弦的中弧线变形方式仍是一种较优的变形方式。
[Key word]
[Abstract]
In this paper,we choose the NACA0015 airfoil,and take two different kinds of camber deformation modes of sinusoidal and piecewise functions,and the effects of the two modes on the flapping wing energy absorption are examined by analyzing the deformation parameters such as maximum deformation position and deformation amplitude under the condition of Re=1×104.The results show that both the two modes can increase the energy absorption efficiency.With the backward shift of the maximum deformation position,the efficiency gains a promotion in larger deformation amplitude,and the sinusoidal form replaces the piecewise function form to become a better deformation mode.The sinusoidal mode reduces the second peak on the output power coefficient curve,but it dramatically increases the region between the first and second peak,so the sinusoidal mode is still a better deformation form.
[中图分类号]
TK89
[基金项目]
国家自然科学基金(51536006);上海市科委科研计划项目(17060502300)