双旋转附属圆柱对主圆柱尾流控制的影响

Effect of Two Rotating Controlled Cylinders on Wake Control of Main Cylinder

基于Fluent软件平台,采用数值模拟方法对非稳态圆柱体结构尾流流动特性进行了研究。对在Re=50~200范围内,双旋转附属圆柱的转速对主圆柱体尾流流动特性的影响进行了分析。研究结果表明:随着附属圆柱旋转速率的增加,主圆柱体表面所受阻力系数平均值与均方根值、升力系数均方根值均会减小。同时,旋转速率的变化对柱体结构表面压力分布的影响显著,压力系数在附属圆柱的位置产生了跳跃性变化。另外,当附属圆柱转速达到临界值时,尾流涡街变窄,涡脱落现象消失,并且系统的能量效率到达最佳状态。

Based on the Fluent software platform,the numerical simulation method was used to study the wake flow characteristics of the unsteady cylindrical structure.In the range of Re=50~200,the influence of the rotational speed of two rotating controlled cylinders on the wake flow characteristics of the main cylinder was analyzed.The results show that with the increase of the rotation rate of the controlled cylinder,the mean and root mean square values of the drag coefficient and the root mean square values of the lift coefficient on the surface of the main cylinder will decrease.At the same time,the change of rotation rate has a significant effect on the pressure distribution on the surface of the cylinder structure.The pressure coefficient has a sudden change at the position of the controlled cylinder.In addition,when the speed of the controlled cylinder reaches the critical value,the wake vortex street becomes narrow,the vortex shedding phenomenon disappears,and the energy efficiency of the system is the best.