研究了亚临界雷诺数下不同长短轴比 (axial ratio, AR) 下的圆柱绕流特性. 通过数值模拟研究了亚临界雷诺数 Re=3.9×10³、5.0×10³、6.0×10³、8.0×10³、10.0×10³, AR=0.1∼1.6 的二维椭圆柱绕流的升力系数、阻力系数以及 St 数的变化趋势, 并结合涡量云图及压力系数分布特征分析了流动特性变化的原因. 分析结果表明, 在亚临界雷诺数下, 不同雷诺数的最大升力系数 CL.m 均呈现随着 AR 增大而先增大后减小的趋势, 并在 AR=0.7时达到最大值. 不同雷诺数的 St 数变化趋势基本一致, 总体呈现上升趋势. 平均阻力系数以AR=0.7 的情况为临界, 呈现出两种不同的变化趋势. 研究结果可为基于压电构型的流致振动俘能装置的优化设计提供指导.

This study explores the characteristics of cylindrical winding flow at varying axis ratios (AR) within subcritical Reynolds numbers. We examine the flow’s lift coefficient, drag coefficient, and St at critical Reynolds numbers of Re=3.9×10³, 5.0×10³, 6.0×10³, 8.0×10³, and 10.0×10³, with AR ranging from 0.1 to 1.6. We analyze the causes of flow characteristics by examining the vorticity cloud map and pressure coefficient distribution. The findings indicate that at subcritical Reynolds numbers, maximum lift coefficient CL.m varies with different Reynolds numbers, displaying a trend of initial increase followed by a decrease as AR increases, peaking at AR = 0.7. The trend in St numbers across various Reynolds numbers is consistently upward. The mean drag coefficient exhibits two distinct trends at a critical point when AR = 0.7. These results offer valuable insights for the optimal design of devices utilizing piezoelectric configurations.