为深入了解顺向阵风来流对圆柱气动力和流场特性的影响，开展了雷诺数（Re）为1000的圆柱绕流三维大涡模拟，研究了不同频率顺向正弦来流对圆柱气动力和流场结构的影响规律，详细分析了升阻力系数、斯特劳哈数（St）、回流长度、分离角和尾流结构等参数的变化规律。顺向正弦来流速度为 ,其中来流频率f的变化范围为0 ~ 0.3Hz，U0为平均速度，A为竖向正弦来流的振幅，设为0.15 U0。研究结果表明：圆柱阻力系数卓越频率（即主导频率）与正弦来流频率基本一致，升力系数存在三个明显的频率峰值，分别对应涡脱频率与来流频率之差，涡脱频率，涡脱频率与来流频率之和。随着正弦来流频率f增大，St先减小后增大，在f = 0.25Hz时达到最小值，而回流长度先增大后减小，且在f = 0.15Hz时达到最大值。当f <= St时，分离角不变，而顺流向最小速度逐渐增大；当f > St时，分离角逐渐增大.
Abstract
To further understanding of the influence of streamwise gust inflow on the aerodynamic forces and flow around a circular cylinder, a 3D large eddy simulation (LES) of flow over a circular cylinder with Reynolds number (Re) of 1000 was carried out to investigate the influence of streamwise sinusoidal inflow with different frequencies on the aerodynamic forces and flow field. The lift and drag coefficients, Strouhal number (St), recirculation length, separation angle and wake structure were analyzed in detail. The velocity of streamwise sinusoidal inflow was set as , where the frequency of the inflow ranged from 0 to 0.3Hz，U0 the mean velocity，A the amplitude of the inflow, A = 0.15 U0. The results indicated that dominant frequency of the drag coefficient was substantially consistent with the frequency of the inflow. There were three obvious peak values of the frequency of the lift coefficient, which were the value of vortex shedding frequency minus inflow frequency, vortex shedding frequency, and the value of vortex shedding frequency add inflow frequency, respectively. The St is reduced first and then increased, with increase of the sinusoidal inflow frequency, and the minimum value can be obtained when f = 0.25Hz, while the recirculation length is increased first and then decreased, and the maximum value can be obtained when f = 0.15Hz. The separation angle was unchanged when f <= St, and the minimum streamwise velocity gradually increased; nevertheless, the separation angle gradually increased when f > St, and the minimum streamwise velocity gradually decreased.
关键词
圆柱绕流 /
大涡模拟 /
顺向正弦来流 /
气动力 /
流场
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Key words
flow around a circular cylinder /
large eddy simulation /
streamwise sinusoidal inflow /
aerodynamic force /
flow field
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参考文献
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