摘要
为了利用分隔板有效控制圆柱绕流,对雷诺数为100的带弹性分隔板的圆柱绕流开展数值模拟,研究分隔板长度和弹性模量对尾迹流场演化特性的影响,探索斯特劳哈尔数、阻力系数、升力系数和最大振幅率等特征参数的变化规律。研究结果表明:分隔板长度和弹性模量对圆柱绕流尾迹演化影响显著,尾迹流场出现交替脱落漩涡和对称不分离等不同流动结构;斯特劳哈尔数、阻力系数均值、升力系数均方根值和最大振幅率随分隔板长度和弹性模量的变化趋势基本一致,当弹性模量为2.0MPa时,斯特劳哈尔数在分隔板量纲一长度为1.2和2.8处出现极大值;当分隔板量纲一长度为1.2时,斯特劳哈尔数、阻力系数均值、升力系数均方根和最大振幅率的最大值分别为0.302,2.981,1.621和0.280。
To effectively control the flow around a circular cylinder using a elastic splitter plate,numerical simulation was conducted on the flow around a circular cylinder with an elastic splitter plate at Reynolds number of 100.The influence of splitter plate length and modulus of elasticity on evolution of wake characteristics was studied.The change rules of Strouhal number,drag coefficient,lift coefficient and maximum amplitude rate were obtained.The results show that splitter plate length and modulus of elasticity have great effect on evolution of circular cylinder wake.Different fluid structures occur in the flow field,including regular vortex shedding and symmetry without flow separation.The changes of Strouhal number,average drag coefficient,root mean value of lift coefficient,and maximum amplitude rate with splitter plate length are basically the same with that of modulus of elasticity.When modulus of elasticity is 2.0 MPa,the maximum Strouhal number appears at the nondimensional splitter plate length of 1.2 and 2.8.When the nondimensional splitter plate length is 1.2,the maximum Strouhal number,average drag coefficient,root mean value of lift coefficient,and maximum amplitude rate are 0.302,2.981,1.621 and 0.280,respectively.
作者
皇甫宇澄
孙志强
HUANGFU Yucheng;SUN Zhiqiang(School of Energy Science and Engineering,Central South University,Changsha 410083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第2期474-479,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51576213)
湖南省自然科学基金资助项目(2017JJ1031)~~
关键词
圆柱绕流
尾迹
弹性分隔板
低雷诺数
flow around a circular cylinder
wake
elastic splitter plate
low Reynolds number
