亚临界雷诺数下椭圆柱绕流特性  

Flow characteristics of elliptical column under subcritical Reynolds numbers

作　　者：吴泳熹 张翔宇 吴昊 张丹 毛方赛 WU Yongxi;ZHANG Xiangyu;WU Hao;ZHANG Dan;MAO Fangsai(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444;Institute of Artificial Intelligence,Shanghai University,Shanghai 200444;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444)

机构地区：[1]上海大学力学与工程科学学院,上海200444 [2]上海大学人工智能研究院,上海200444 [3]上海大学机电工程与自动化学院,上海200444

出　　处：《上海大学学报（自然科学版）》2024年第3期532-544,共13页Journal of Shanghai University:Natural Science Edition

基　　金：教育部春晖计划资助项目(202201747)。

摘　　要：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=3.9×10^(3)、5.0×10^(3)、6.0×10^(3)、8.0×10^(3)、10.0×10^(3),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=3.9×10^(3),5.0×10^(3),6.0×10^(3),8.0×10^(3),and 10.0×10^(3),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.

关 键 词：圆柱绕流 长短轴比 亚临界雷诺数 圆柱绕流特性 

分 类 号：O368[理学—流体力学]