旋转方式对并列双圆柱绕流特性的影响

Effect of Rotational Modes on the Flow Characteristics of Two Rotating Side-by-Side Circular Cylinders

基于层流模型,使用有限体积法对并列旋转双圆柱绕流进行数值模拟计算。首先计算雷诺数为100时静止单圆柱绕流与旋转单圆柱绕流的流动性能,并与参考文献结果进行比较,验证计算的可靠性;然后,分析了两圆柱在中心间距比为3.0时圆柱不同旋转方式与旋转速度比对双圆柱绕流流动性能的影响。结果表明:逆流向旋转比顺流向旋转的临界转速更小,对涡旋脱落的抑制效果更好;两种旋转方式下时均升力系数绝对值均随旋转速度比的增大而增大;逆流向旋转下时均阻力系数随旋转速度比的增大而减小,顺流向旋转下时均阻力系数随旋转速度比的增大先增大后减小。

Based on the laminar flow model,the finite volume method was used to numerically simulate the flow around two rotating side-byside circular cylinders. First,when the Reynolds number Re = 100,the flow characteristics of the flow around a stationary single circular cylinder and the flow around a single rotating circular cylinder were calculated. Through the comparison between the calculation results and previous literature results,the computation in this paper was proved reliable. Then the effect of different rotation modes and rotation speed ratio αon the flow characteristics of the flow around two circular cylinders under the condition of T/D = 3.0 was analyzed. Compared with two circular cylinders rotating along the direction of flow( mode 1),the rotation mode two circular cylinders rotating against the direction of flow( mode2),its critical speed was smaller,the ability to attenuate vortex shedding was better. The absolute value of the lift coefficient increased with the increase of the rotational speed α in two rotational modes,the value of the drag coefficient decreased with the increase of the rotational speed α in mode 1,with the rotational speed α increased,the value of the drag coefficient increased first,then decreased in mode 2.