【作者】 孙旭； 叶泽华； 张家忠；

【Author】 Sun Xu;Ye Zehua;Zhang Jiazhong;China University of Petroleum-Beijing;Xi’an Jiaotong University;

【机构】 中国石油大学(北京)机械与储运工程学院； 西安交通大学能源与动力工程学院；

【摘要】 采用流-固耦合数值模拟对0<Re(雷诺数)≤1000和0≤?(7)攻角(8)≤30o范围内某仿生薄膜翼型的涡激振动特性进行了研究。通过选取大量计算点,获得了薄膜翼型涡激振动在所计算Re-?参数平面区域内的分岔过程。计算结果表明:随着雷诺数和攻角的增大,薄膜翼型响应将首先经Hopf分岔由静态转变为周期1振动,然后经过连续的倍周期分岔转变为多倍周期、准周期和混沌振动。其中,Hopf分岔由薄膜翼型背风面前缘涡和/或后缘涡的脱落激发,而倍周期分岔与附面二次涡的出现和演化相关。更多还原

【Abstract】 Vortex-induced vibrations(VIVs) of a fixed two-dimensional perimeter-reinforced(PR) membrane wing at 0<Re(Reynolds number)≤1000 and 0≤?(7)angle of attack(8)≤30 o are investigated using fluid-structure interaction simulations.By using very fine increments for Re and?(11) bifurcation boundaries of the dynamic response of the membrane wing in the Re-? plane are captured.With increases of Re and/or ?,it is found that the VIV state of a fixed PR membrane wing will change progressively from steady state to period 1 via a Hopf bifurcation and then from period 1 to multiple period and chaos via a succession of period-doubling bifurcations.The Hopf bifurcation is triggered by the shedding of the leading-and/or trailing-edge vortices,while the period-doubling bifurcations are induced by the generation and evolution of the secondary vortices on the upper surface of the membrane wing at higher Re and ?(13)更多还原